CROWN CE-2000 (01) PDF MANUAL


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PDF Content Summary: CE SERIES CE SERIES CE SERIES Service Manual PROFESSIONAL AUDIO AMPLIFIERS Models: CE-1000, CE-2000 (some units may have the model names: CE-1000A, CE-2000A, CE-2000TX, UT-1010, UT-2020, M120, M240, S2, and S3) © 2002 by Crown Audio, Inc., P.O. Box 1000, Elkhart, Indiana 46515-1000 U.S.A. Telephone: 574-294- 8000. CE Series amplifiers are produced by Crown International, Inc. Trademark Notice: Crown and MultiMode are registered trademarks of Crown International. Other trademarks are the property of their respective owners. 130352-1 10/02 Rev. D CE Series Service Manual Rev. D The information furnished in this manual does not include all of the details of design, production, or variations of the equipment. Nor does it cover every possible situation which may arise during installation, operation or maintenance. If you need special assistance beyond the scope of this manual, please contact the Crown Technical Support Group. Mail: P.O. Box 1000 Elkhart IN 46515-1000 Shipping: 1718 W. Mishawaka Rd., Elkhart IN 46517 Phone: (800) 342-6939/(574) 294-8200 FAX: (574) 294-8301 Web: crownaudio.com CAUTION AVIS TO PREVENT ELECTRIC SHOCK

DO NOT REMOVE TOP OR BOTTOM COVERS. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. DISCONNECT POWER CORD BEFORE REMOVING REAR INPUT MODULE TO ACCESS GAIN SWITCH. À PRÉVENIR LE CHOC ÉLECTRIQUE N’ENLEVEZ PAS LES COUVERTURES. RIEN DES PARTIES UTILES À L’INTÉRIEUR. DÉBRANCHER LA BORNE AVANT D’OUVRIR LA MODULE EN ARRIÈRE.

WARNING TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE! I Rev. D CE Series Service Manual Revision History Revision Number Date Changes Rev. A 3-98

Rev. B Rev. C Rev. D 2-99 5-99 10-02 Initial Printing Added Additional Module Documentation. Added Revision History. Added Inside Cover Page. Updated Cover Page and Table of Contents. Updated Graphic on Page 1-1. Updated Specifications on Page 1-2. Added Section 7, Module and Schematic Information. Added Section 8, Module Parts Lists. Moved existing Module Parts Lists from Section 6 to Section 8. Added Module Parts Lists for Module CPNs:102139-11, 102140-11, 127321-1, 127323-1, 127353-1, 127373-2, 127354-1, and 127354-2. Added Section 9, Field Service Modifications. Added Section 10, Schematics. Moved all existing Schematics from Section 6 to Section 10. Added Schematics 102141M and 102142M. Updated Cover Page, Revision History and Table of Contents. Revised fan part no. from 125400-3 to 133551-1. Updated phone number area code. Updated sections 1.2, 1.3.6, 7.2, 7.2.1, 7.2.3, 7.3, 7.3.2, 7.3.3, 7.4.1, 9.2, 9.4. Added Module Parts Lists for Module CPNs: 102140-9 revB, 126883-2 rev B, 127321-2, 127323-2, 127353-3, 127354-3, 127451-4 and 127452-4. Added Schematics 127451-4 and 127452-4. Added Assembly Parts List for CE1000A and CE2000A Domestic. Revised Crown logo. Updated Cover Page, Revision History and Table of Contents.

II CE Series Service Manual Rev. D This page intentionally left blank III Rev. D CE Series Service Manual Table of Contents 1 Introduction .............................................................................. 1-1 1.1 The CE-Series .................................................................. 1-1 1.2 Warranty ........................................................................... 1-1 1.3 Specifications .................................................................. 1-2 1.3.1 Performance ............................................................ 1-2 1.3.2 Power....................................................................... 1-2 1.3.3 Controls ................................................................... 1-2 1.3.4 Indicators ................................................................. 1-2 1.3.5 Input/Output ............................................................. 1-2 1.3.6 Connectors .............................................................. 1-2 1.3.7 Construction ............................................................ 1-2 2 Maintenance............................................................................. 2-1 2.1 Surface Mount Technology .............................................. 2-1 2.2 Cautions and Warnings.................................................... 2-1 2.3 Troubleshooting ............................................................... 2-1 2.3.1 Pre-AC-Checks........................................................ 2-1 2.3.2 Main Module Removal ............................................. 2-2 2.3.3 Static Checks .......................................................... 2-2 2.4 Checkout/Adjustment Procedures ................................... 2-2 2.4.1 Equipment Required................................................ 2-3 2.4.2 Initial Conditions ...................................................... 2-3 2.4.3 Test Procedure......................................................... 2-3 2.4.4 Service Kit Wire Extensions ..................................... 2-3 3 Circuit Theory ........................................................................... 3-1 3.1 Front End Operation......................................................... 3-1 3.2 Balanced Gain Stage....................................................... 3-1 3.3 Variable Gain Stage ......................................................... 3-1 3.4 Error Amp......................................................................... 3-2 3.5 Voltage Amplification ....................................................... 3-2 3.5.1 Voltage Translator .................................................... 3-2 3.5.2 Last Voltage Amplifier .............................................. 3-2 3.5.3 Bias Servo ............................................................... 3-2 3.2.2 Output PCA ............................................................. 3-3 3.6 Output Topology .............................................................. 3-2 3.6.1 Pre-Driver ................................................................ 3-3 3.6.2 Driver ....................................................................... 3-3 3.6.3 Output Devices........................................................ 3-3 3.6.4 Flyback Diodes........................................................ 3-3 3.6.5 Output Terminating Network .................................... 3-3 3.7 Power Supply ................................................................... 3-3 3.7.1 Low Voltage Supply ................................................. 3-3 3.7.2 Bootstrap Supply ..................................................... 3-3 3.7.3 High Voltage Supply ................................................ 3-4 IV CE Series Service Manual Rev. D Table of Contents 3.8 Protection Circuitry........................................................... 3-4 3.8.1 Time Dependent VI Limit ......................................... 3-4 3.8.2 Temperature Protection ........................................... 3-5 3.8.3 Low-Frequency and Short-Circuited Protection....... 3-5 3.8.4 Input Compressor.................................................... 3-5 3.8.5 Turn-On Delay.......................................................... 3-6 3.8.6 Output Relay Muting................................................ 3-6 3.8.7 Input Muting ............................................................ 3-6 3.8.8 Auxiliary Output Jack .............................................. 3-6 3.9 Fan Control Circuitry ........................................................ 3-6 4 Neutrik Connectors .................................................................. 4-1 5 Parts ......................................................................................... 5-3 5.1 General Information ......................................................... 5-3 5.2 Standard and Special Parts ............................................. 5-3 5.3 Ordering Parts ................................................................. 5-3 5.4 Shipment .......................................................................... 5-3 5.5 Terms ............................................................................... 5-3 6 Exploded Views, Parts Lists ..................................................... 6-1 Assy. CE 1000 Domestic........................................................ 6-2 Assy. CE 1000 PWA & Chassis .............................................. 6-4 HS Assy. CE 1000 Isolated Ch. 1........................................... 6-6 HS Assy. CE 1000 Isolated Ch. 2........................................... 6-8 HS Assy. CE 1000 Non-isolated Ch. 1 ................................. 6-10 HS Assy. CE 1000 Non-isolated Ch. 2 ................................. 6-12 Assy. CE 2000 Domestic...................................................... 6-14 Assy. CE 2000 PWA & Chassis ............................................ 6-16 HS Assy. CE 2000 Isolated Ch. 1......................................... 6-18 HS Assy. CE 2000 Isolated Ch. 2......................................... 6-20 HS Assy. CE 2000 Non-isolated Ch. 1 ................................. 6-22 HS Assy. CE 2000 Non-isolated Ch. 2 ................................. 6-24 Assy, CE 1000A Domestic ................................................... 6-26 Assy, CE 2000A Domestic ................................................... 6-28 7 Module and Schematic Information.......................................... 7-1 8 Module Parts ............................................................................ 8-1 NOTE: In Section 8, page numbers are on component-map title pages only. PWA 102139-6 ....................................................................... 8-3 Component Map............................................................. 8-17 PWA 102139-8 ..................................................................... 8-19 Component Map............................................................. 8-33 PWA 102139-9 ..................................................................... 8-35 Component Map............................................................. 8-49 V Rev. D CE Series Service Manual Table of Contents PWA 102139-11 ................................................................... 8-51 Component Map............................................................. 8-65 PWA 102140-6 (102140 revH) ............................................. 8-67 Component Map............................................................. 8-81 PWA 102140-8 ..................................................................... 8-83 Component Map............................................................. 8-97 PWA 102140-9 revB ........................................................... 8-100 Component Map........................................................... 8-119 PWA 102140-9 rev C.......................................................... 8-122 Component Map........................................................... 8-141 PWA 102140-11 ................................................................. 8-144 Component Map........................................................... 8-163 PWA 102689 ...................................................................... 8-166 Component Map........................................................... 8-169 PWA 102690 ...................................................................... 8-170 Component Map........................................................... 8-173 PWA 126883-2 revB ........................................................... 8-174 Component Map........................................................... 8-177 PWA 126883-2 revC........................................................... 8-178 Component Map........................................................... 8-181 PWA 127321-1 ................................................................... 8-182 Component Map........................................................... 8-200 PWA 127321-2 ................................................................... 8-203 Component Map .......................................................... 8-220 PWA 127323-1 ................................................................... 8-223 Component Map........................................................... 8-242 PWA 127323-2 ................................................................... 8-245 Component Map........................................................... 8-262 PWA 127353-1 ................................................................... 8-265 Component Map........................................................... 8-283 PWA 127353-2 ................................................................... 8-286 Component Map........................................................... 8-304 PWA 127353-3 ................................................................... 8-307 Component Map........................................................... 8-325 PWA 127354-1 ................................................................... 8-328 Component Map........................................................... 8-347 PWA127354-2 .................................................................... 8-350 Component Map........................................................... 8-369 PWA 127354-3 ................................................................... 8-372 Component Map........................................................... 8-391 PWA 127451-4 ................................................................... 8-394 Component Map........................................................... 8-412 PWA 127452-2 ................................................................... 8-415 Component Map........................................................... 8-434 VI CE Series Service Manual Rev. D Table of Contents 9 Field Modifications ..............................................9-1 9.1 Fan Circuit Balast Resistors .........................9-1 9.2 Timing/Mute Capacitors ...............................9-1 9.3 Modification for Noise/Oscillation Problem ..9-3 9.4 Bootstrap Resistor Modification ...................9-4 9.5 Channel 1 Output to Channel 2 Speakon ....9-5 10 Schematics .........................................................10-1 VII PART I Technical Information CE Series Service Manual Rev. D This page left intentionally blank Rev. D CE Series Service Manual CE 2000 front and back panels also feature a proportional speed fan, which optimizes

1 Introduction This manual contains service information for the Crown CE-Series power amplifiers. It is designed to be used in conjunction with the CE-Series Reference Manual. Some important information is, however, duplicated in this Service Manual in case the Reference Manual is not readily available. NOTE: THE INFORMATION IN THIS MANUAL IS IN TENDED FOR USE BY AN EXPERIENCED TECHNI CIAN ONLY! 1.1 The CE-Series The CE-Series amplifiers are compact, audio power amplifiers designed for professional use. These units provide high-power amplification from 20 Hz-20 kHz with minimum distortion. Features of these amplifiers are both Balanced Neutrik Combo (1/4-inch and XLR) and Barrier Block Inputs, Signal, Clip and Fault indi cators, stereo or bridged-mono capability, switchable sensitivity, and Neutrik Speakon© Outputs. These units cooling efficiency. 1.2 Warranty Each Reference Manual contains basic policies as related to the customer. For further assistance please contact the Crown Technical Support Group at: Crown International, Inc. Mailing: PO Box 1000 Elkhart, IN 46515-1000 or Shipping: 1718 W. Mishawaka Rd. Elkhart, IN 46517 Toll Free: (800) 342-6939 Phone: (574) 294-8000 FAX: (574) 294-8301 Web: crownaudio.com Introduction 1-1 1.3 Specifications CE Series Service Manual Rev. D the amplifier operates as two independent channels. Crown specifications are guaranteed for three years. Further, we guarantee that every Crown amplifier will meet or exceed its published specs. 1.3.1 Performance Note: Measurements made in Stereo, both channels driven into 8 ohms. Frequency Response: ± 0.1 dB from 20 Hz to 20 kHz at 1 watt. Phase Response: ±15° from 20 Hz to 20 kHz at 1 watt. Signal to Noise at 8 Ohms Rated Power: >105 dB A Weighted. >100 dB from 20 Hz to 20 kHz. Total Harmonic Distortion (THD): <0.5% from 20 Hz to 1 kHz. I.M. Distortion (60 Hz and 7 kHz at 4:1): <0.1% from 8 ohms rated power to -35 dB. Damping Factor: >400 from 10 Hz to 400 Hz. Crosstalk: >–55 dB from 20 Hz to 20 kHz. : Common Mode Rejection (CMR): >70 dB from 20-Hz to : 1 kHz. 1.3.2 Power Output Power: (Max. average power at 1 kHz with 0.5% THD.) CE 1000 Stereo: 275 W/channel into 8 ohms, 450 W/ channel into 4 ohms, 560 W/channel into 2 ohms, both channels driven. CE 1000 Bridged Mono: 900 W into 8 ohms, 1100 W into 4 ohms. CE 2000 Stereo: 400 W/channel into 8 ohms, 660 W/ channel into 4 ohms, 975 W/channel into 2 ohms, both channels driven. CE 2000 Bridged Mono: 1320 W into 8 ohms, 1950 W into 4 ohms. Load Impedance: Rated for 16-, 8-, 4-, and 2-ohm use. Safe with all types of loads, even reactive ones. AC Power CE 1000: 120V/50-60 Hz @ 6.3 amps, 230- 240V/50 Hz @ 3.5 amps, 100V/50 Hz @ 7.6 amps AC Power CE 2000: 120V/50-60 Hz @ 9.5 amps, 230- 240V/50 Hz @ 5.1 amps, 100V/50 Hz @ 11.4 amps 1.3.3 Controls Front Panel: An on/off rocker switch; also, a detented rotary level control for each channel. Back Panel: A two-position input sensitivity switch located below the input connectors. Can be set to 1.4 V for full output into an 8-ohm load, or set to a fixed voltage gain of 26 dB; Some models have an internal jumper located on the Main PWA for setting optional 0.775V sensitivity. A two-position mode switch located below the input connectors. When turned to stereo, Introduction 1-2 When in “bridge-mono” mode the amplifier bridges the two output channels for twice the output voltage. 1.3.4 Indicators A green LED SIGNAL indicator for each channel, which flashes when a very low level signal (>–40 dBm) is present at input. A red LED CLIP indicator for each channel which turns on when distortion becomes audible in the amplifier output. A red FAULT indicator which will blink under 5 different conditions: 1. When the amplifier is first powered up, until the unit is ready for operation. 2. If the heatsinks reach a temperature above nor mal working limits. 3. If the transformer thermal protection circuit is acti vated. 4. If the load on the amplifier develops a short- cir cuit. 5. Should the amplifier ouput stage become non-op erational. A green LED POWER indicator that turns on when the am plifier has been turned on and has power. 1.3.5 Input/Output Input Stage: Input is electronically balanced and employs precision 1% resistors. Input Impedance:Nominally 20 K ohms, balanced. Nominally 10 K ohms, unbalanced. Input Sensitivity: 1.4 volts for standard 1-kHz power or fixed 26-dB gain. Output Impedance: <20 milliohms in series with less than 3 microhenries in stereo mode. DC Output Offset: <±10 millivolts. 1.3.6 Connectors Inputs: One Neutrik Combo connector for each channel which features a balanced 1/4-inch phone jack and a 3-pin female XLR connector, in parallel with a barrier strip termination. Outputs: Two Neutrik Speakon® NL4MP (mates with NL4FC) output connectors. Optional binding post and barrier block output adaptors are available on the CE 1000A and CE2000A, and are standard on some models. 1.3.7 Construction Rugged steel chassis formed into a durable package that is coated with enviromentally friendly powder for long life and ease of maintenance.

Rev. D CE Series Service Manual

Dimensions: Standard 19-inch (48.3-cm) rack mount width (EIA RS-310-B), 5.25-inch (13.34-cm) height and 12.25-inch (31.11-cm) depth behind front mounting surface. Weight: The CE 1000 weighs 32.6 pounds (14.79 kg). The CE 2000 weighs 40.3 pounds (18.28 kg). For shipping weight, add 6 lbs (2.7 kg) to each amp. Mounting: Standard EIA 310 front-panel rack mount. Introduction 1-3 2 Maintenance CE Series Service Manual Rev. D LETHAL energy levels! Be very careful when making connections. Do not attempt to change output wiring until the amplifier has been off at least 10 seconds. WARNING: This unit is capable of producing high sound pressure levels. Continued exposure to high sound Fundamentally, troubleshooting involves looking for an abnormal situation. When a problem has been observed, it is obvious that something is not doing what it is ex pected to do. A single part, solder joint, or trace is usu ally the root cause, and testing for typical voltages and signal tracing can usually result in a solution for most of the problem units. Unfortunately, there are two other sce narios. (1) Sometimes a single problem may cause other parts to fail so there will be several parts that must be replaced. In this case, however, finding the root cause is not as important as just finding all of the blown or dam aged parts and replacing them. The failed part will prob ably (but not always) be among them and the act of replacing the parts will fix the amplifier. (2) If the ob served behavior is an oscillation, high THD, or the output slammed to one of the rails, the very nature of a feed back amplifier will spread this effect throughout the power amplifier section. This troubleshooting guide and a fa miliarity with amplifier operation should help you fix what ever comes your way! 2.1 Surface Mount Technology The CE-Series amplifiers use surface mount technology in their design. There are several advantages to using surface mount technology (SMT), including; (1) surface mount devices (SMDs) are much smaller, and are mounted to the surface of the board, so more compo nents can be placed on the board. (2) Components can be attached to both sides of the board, allowing the board size to be reduced. (3) SMT boards are lighter and pro vide better electrical performance signal speed. Of course, there are also things to watch out for with SMT. (1) The placement of the components on the board, not through a hole, makes the components and the sol der joint more susceptible to damage. (2) Rework of SMDs can often require specialized tools, equipment, or train ing. (3) SMDs are very small and can be difficult to handle, see, and identify. Remember that on the CE-Series amplifiers, the SMDs on the bottom side of the main module are GLUED. Take care not to damage components while trying to remove them from the surface of the module. 2.2 Cautions and Warnings DANGER: The outputs of this amplifier can produce Maintenance 2-1 pressure levels can cause permanent hearing impairment or loss. User caution is advised and ear protection is recommended when using at high levels. WARNING: Do not expose this unit to rain or moisture. WARNING: Only properly trained and qualified technicians should attempt to service this unit. There are no user serviceable parts inside. WARNING: When performing service checks with the power off, discharge the main power supply filter capacitors fully before taking any measurements or touching any electrical components. A 300-ohm 10-W resistor is recommended for this. Hold the resistor with pliers, as the resistor may become extremely hot. WARNING: Under load, with a sine wave signal at full power into both channels, the amplifier may draw in excess of 30 amperes from the AC service mains. WARNING: When performing tests in Section 2.3, do not connect any load to the amplifier until instructed to do so. There is no danger to the amplifier in operating without any load (open outputs). WARNING: Do not change the position of the Mode Switch when the amplifier is turned on. If the position of this switch is changed while the amplifier is powered, transients may damage your speakers. WARNING: Heatsinks are not at ground potential. Simultaneously touching either heatsink and ground, or both heatsinks will cause electrical shock. CAUTION: Eye protection should be worn at all times when protective covers are removed and the amplifier is plugged in. CAUTION: When performing tests in Section 2.3 that require a load, the load must be resistive and must be capable of handling 1000 W (per channel). CAUTION: Disconnect the power cord before installing or removing any cover or panel. CAUTION: Electrostatic discharge will destroy certain : components in the amplifier. Techicians must have approved ESD protection. Proper grounding straps and test equipment are required. 2.3 Troubleshooting 2.3.1 Pre-AC-Checks A number of checks can be made prior to powering up the unit. These should be done in order to prevent an unwanted disaster when turning the unit on. Once these checks are made, power may be applied for further checks. Note: It will be necessary to remove the top panel for complete access to all modules.

Rev. D CE Series Service Manual

Step 1: Acquire all information possible from the person(s) having the problem to determine the nature of the com plaint. Ask questions like “Why was the amplifier brought in for repair?” “Does it do this at turn on, does it take a while, or does it only happen sometimes?” If you observe nothing wrong, inquire tactfully how the unit was being used when the malfunction occurred. This will help determine if the unit may have been misused, if the user misunderstood what happened, or if another system component may be at fault. Remember, this is one of the first amplifier series to have only Neutrik Speakon® connectors for the outputs. There is room for error in assembling the connectors. Be sure to ask if the person may have had problems with the Speakons. Step 2: Always do a complete visual inspection. A problem may be obvious just by looking at the unit. Things to look for include burned components, wires not connected, fan obstructions, loose hardware or connections, and solder ing. Plugged heatsinks can greatly reduce amplifier effi ciency. The fan blades should spin freely. Burns and other physical damage should be repaired and components in the affected circuit areas should be checked carefully be fore continuing. Whether a problem is identified by visual inspection or not, several checks should be performed prior to turning the amplifier on. These should be performed if any of the follow ing problems have been reported: catastrophic failure, no signal output with constantly blinking Fault LED, or the con dition of the amplifier is otherwise unknown but failure is suspected. The third step on the “to do” list involves a number of elec trical checks. Due to the protection features of the CE-Series amplifiers, it should be safe to turn-on under all circum stances, but these preliminary checks may allow a partial (if not complete) repair before power is ever applied. These checks are designed to find problems in the output stages. The ultimate guide should always be common sense. 2.3.2 Main Module Removal 1. Remove the top cover by removing the four side screws, lift up slightly on the rear of the cover, and then pull it toward the back of the amplifier. Many of the parts are located on the bottom side of the circuit board. In most situations, the circuit board won’t need to be removed from the chassis. In the event that it does, go to step 2. 2. Remove the red and blue wires from the rectifier block that is screwed to the bottom of the chassis near the power supply capacitors and short the wires together through a resistor such as a 300-ohm 10 W. 3. Disconnect the in-line FASTON that connects the circuit board to the transformer. 4. Disconnect the 4-wire connector from the circuit board that comes from the transformer. 5. Disconnect the small white wire that connects the circuit board to the rectifier block. 6. Remove the four screws that hold the input assembly to the chassis. Unplug the input assembly from the ribbon cable. 7. Remove the four screws that hold the output jacks to the back panel. 8. Unplug the fan from the circuit board. 9. Remove the eight screws (five in the rear, three in the front) that hold the circuit board down to the chassis. 10. Remove the knobs from the gain pots by pulling the knobs out the front. The circuit board will now lift out of the chassis; but be careful, it is a tight fit. 2.3.3 Static Checks 1. Locate the flyback diodes D114, D115, D214, and D215 on the main modules and check for indications of a short. If a short is indicated, this means that an output device or driver transistor in parallel with that diode is shorted, usually not the diode itself. If an output device is found to be defec tive, emitter resistors should also be checked. If no output device is found defective, perform a quick check of driver, pre-driver, and bias transistors. Then, if no problem is found, move to the power-on checks in Section 2.3 2. Check driver and pre-driver transistors for shorts or opens. If a fault is found, do an in-circuit static check of all semicon ductors on the output modules. If no output device and nothing upstream is found defective, move to power-on checks. Otherwise continue. 3. If a failure has occurred anywhere in the output stages, check the bias servo transistor. Any failure associated with bias transistors may result in repeat failure of the affected channel even if all other defective components have been found and replaced. 4. If a failure is found in any LVAs, checks should continue up to the voltage translator stage. 5. Failure within the power supply itself is very rare; how ever, a cursory check of major items is always prudent. 2.4 Checkout/Adjustment Procedures The following instructions outline an orderly checkout and troubleshooting procedure. The purpose and arrangement of this procedure is to ensure proper operation after a repair has been completed. Before beginning these power-on tests, review all cautions and warnings in Section 2.1, and perform the checks listed in Section 2.2. These checks will minimize the possibility of receiving a nasty surprise when turning on the CE-Series amplifier. WARNING! Most adjustments are made with the cover removed. Maintenance 2-2

CE Series Service Manual Rev. D

WARNING! Most adjustments are made with the cover removed. Prior to any AC power off testing, discharge all power supply capacitors. Also, use extreme caution when making internal adjustments when the unit is powered. 2.4.1 Equipment Required The following is a list of standard equipment needed to perform all the tests listed in Section 2.3.3: Line Voltage Variac: 2-kW or larger. Oscilloscope: 2 Channel, 10-MHz or better. Digital Multimeter: Various measurements. Watt Meter: For AC line draw. ACVM: Peak reading RMS calibrated (all AC line volt age and amplifier output voltage checks). I.M.D. Analyzer: 60 Hz/7 kHz in 4:1 ratio, accurate to 0.001% I.M.D. T.H.D. Analyzer: Accurate to 0.001%. Loads: 2000 W continuous at 1 ohm. tempting to make very precise THD or noise measure ments, the main module must be completely installed in the chassis with all seven mounting screws properly seated to their specified torque, 12-14 in-lb (1.35-1.58 newton meters). This assures a proper low-impedance ground path for the module. However, if you require measuring THD or noise with the main module removed from the chassis, please call technical support for further informa tion and instruction. If you are attempting to check or measure VI limiting, out put power, or any other test which would require the ampli fier to produce large amounts of heat, the main module should be securely mounted inside the chassis with the fan connected. If the module must be removed from the chassis, the test should be of very short duration, and/or an external fan should be used for cooling the heat sinks. Service Kit Assembly Instructions 1. Follow the main module removal procedure.

2.4.2 Initial Conditions Positive Positive

2. Attach the 16AWG blue wire in the service kit to the

The start of each step assumes all switches are pre-set to Driver Stage Output Stage

the following positions: Error 16AWG blue wire on the main module and to the negative

BGS VGS Mode Switch: STEREO position. Amplifier tab on the rectifier. Amplifier Output

Input Sensitivity Switch: 1.4 V position. 3. Attach the 16AWG red wire in the service kit to the

- - + Signal 16AWG red wire on the main module and to the positive

Level Controls: Both up (clockwise) fully. Bias tab on the rectifier. Protection Mute

Translator LVA Servo Circuitry Circuitry

+ + - 2.4.3 Test Procedure 4. Attach the 22AWG white wire in the service kit to the 22AWG white wire on the main module and to the AC tab The following steps are arranged in order for best results and, for the most part, easiest use. Read each step care on the rectifier. 5. Attach the 14AWG black/white wire in the service kit to

Audio Positive Positive

fully before proceeding. Read all precautions in Section 2.1 the 14AWG black/white wire on the main module to the

Input Driver Output

before continuing. Use extreme caution and good common 14AWG black/white wire coming from the transformer.

Stage Stage

sense at all times. The preceding warnings and cautions are detailed for good reason. 2.4.4 Service Kit Wire Extensions A service kit containing wire extensions is available from the Crown Parts Department (part # 125581-1). By using the wire extensions provided in the kit, maneuverablility of the main module is greatly increased. When using the service kit, it is required that all instructions be followed. Special Note On Grounding: Whenever the main module is removed from the chassis and power is applied, the ground ing wires absolutely must be attached. Also, if you are at 125613-1 Service 6. Plug in the female 4-pin connector on the 4-wire service assembly to the 4-pin header on the main board. Plug the Negative Feedback (NFb) male end into the 4-pin female connector coming from the transformer, making sure the orientation is as shown in Figure 2.1. Plug in the input module. Optional Grounding Wire 7. On the 12AWG green ground wire, attach the longest wires’ ring terminal to the chassis ground shown in Figure 2.2, using the PWA mounting screw. The remaining three wires should be attached to the PWA at the three ground ing locations shown in Figure 2.2, using the 6-32 screws and 6-32 hex nuts provided in the kit. 4-pin header from Transformer

Red/White Red/White White 1 2 3 Red/White Red/White White

White Maintenance 2-3 4 White Figure 2.1 4-pin Connector Wiring Diagram.

Rev. D CE Series Service Manual Figure 2.2 CE 1000 with Main Module Removed and Service Kit Installed Maintenance 2-4 CE Series Service Manual Rev. D WARNING: Do not connect any load to the CE-Series power amplifier during these tests until specifically instructed to do so. Type of Test Input Signal and Comments or Adjustment Load Parameters

1. Turn-on Delay No Signal No Load 2. DC Output Offset No Signal No Load 3. Quiescent Power No Signal No Load 4. Bias No Signal No Load 5. Sensitivity (Gain) 1-kHz Sine Wave No Load Maintenance 2-5 Check for a delay of approximately 6 seconds from the time the power switch is turned on until the fault indication clears. If the fault fails to clear, check for presence of rail voltages and for a DC offset. Turn unit off, disconnect the power cord, discharge power sup plies, and check for a failure in the output stage of the affected channel, or other applicable circuit area. If the fans lock in high speed after delay times out, check fan control components. With the input level controls turned fully clockwise, the DC offset for both channels should be less than ±10 millivolts. A large DC offset usually indicates a failure in the output stage, though such an offset should have shut down the amplifier on a DC/LFI signal. While there is no published specification on quiescent power, it should be checked. A power draw with the fan off or operating slowly will normally be less than 150 W (<1.5 A). If quiescent power greatly exceeds expectation, then turn the amplifier off immediately and search for power supply or output failure. If quiescent draw exceeds expectation by a “small” amount, check bias immediately. Bias voltage is set while the amplifier is at room tem perature. If the amplifier is hot from prior testing for repair or other purposes, it should be set aside until it has cooled before continuing with this check. Bias, once factory set, normally will not require adjustment. For channel 1: Measure the voltage at TP38 with re spect to channel 1 positive output (DO NOT measure from ground reference). The bias voltage should equal 0.31V ± 50 millivolts. If the bias voltage needs to be adjusted, adjust R134 for the correct bias voltage. For channel 2: Measure the voltage at TP39 with respect to channel 2 positive output (DO NOT measure from ground reference). The bias voltage should equal 0.31V ± 50 millivolts. If the bias voltage needs to be ad justed, adjust R234 for the correct bias voltage. Set the sensitivity switch to the 26-dB position, check that both level controls are full clockwise. Insert a 1.4V 1-kHz sine wave and measure 26.6V–29.4V at the out put of each channel. Set the sensitivity switch to the1.4V position and measure 44.5V-49.2V at the output of each channel for the CE 1000, and measure 53.7V-59.4V at the output of each channel for the CE 2000.

Rev. D CE Series Service Manual Type of Test Input Signal and Comments or Adjustment Load Parameters

6. Bridge Mono 1-kHz Sine Wave No Load 7. LED Check No Input No Load 8. Current Limit 1-kHz Sine Wave 9. 10-kHz Square Wave 10-kHz Sq. Wave Slew Rate Test 8-ohm Load Note: Always turn power to the amplifier off prior to changing the position of the Mode Switch. With the dual/mono switch in the bridge mono position, insert a 0.775 Vrms 1-kHz signal into channel one input. There should be signal present on both channel outputs, equal in amplitude, with channel two 180 degrees out of polarity from channel one (see Fig. 2.3). Channel one input level control should control the output level for both channels. Return the amplifier to stereo opera tion. Turn the amplifier on after being off at least 10 sec onds. Make sure the green Power LED is on. If not, check the ground screw at the front of the amplifier, near C218, that holds the PWB to the chassis. Also suspect R4, E1, or R19. Set the sensitivity switch to 26-dB and check that both level controls are fully clockwise. Insert a 3.5V 1-kHz sine wave into channel 1 only and capture the output signal on a digital storage scope. Turn off the signal. The limits for the CE 1000 are 20 A ±5 A. For the CE 2000 the limits are 25.5 A ±5.5 A. Change the input signal to channel 2 only and repeat the test. With an 8-ohm load on each channel, insert a 10-kHz square wave and adjust amplitude to produce an out put 10V below clipping. Observe a 7V/µS (or higher) slew rate. The output waveform should be stable with no ringing or over-shoot.

Fig. 2.3 Bridge MONO Maintenance 2-6 CE Series Service Manual Rev. D WARNING: Many of the following checks are done by connecting a resistive load to the output of the amplifier. Use caution and follow check-out procedures carefully to ensure correct results. These tests require a resistive load capable of over 2000 W continuous into as low as 2 ohms. WARNING: The CE-Series is capable of drawing in excess of 30 Amperes of current from 120VAC mains when loaded to 2 ohms per channel and with both channels driven by a 1 kHz sine wave. For tests numbered 10-15 the main module should be placed back into the chassis if at all possible. Otherwise, the heatsinks will become very warm, causing the amplifier to thermally protect itself. It is also possible under high-power bench testing to trip the front panel circuit breaker. Also, with the module removed from the chassis, test #14, Fan Operation, will not be able to be performed. Type of Test Input Signal and Comments or Adjustment Load Parameters

10. 1-kHz Power + THD 1-kHz Sine Wave Various Loads 11. Intermodulation I.M. Signal Source Distortion (I.M.D.) 8-ohm Load Maintenance 2-7 Make sure the sensitivity switch is set to 26 dB. Note: Operation with a sine wave into a low-impedance load will cause the circuit breaker to trip after 10 to 20 sec onds. AC Mains of 120 VAC, 60-Hz 8-Ohm Load: Minimum voltage is 46.9 Vrms (275W) with <0.5% THD for the CE 1000 and 56.6 Vrms (400W) with <0.5% THD for the CE 2000. 4-Ohm Load: Minimum voltage is 42.4 Vrms (450W) with <0.5% THD for the CE 1000, and 51.3 Vrms (660W) with <0.5% THD for the CE 2000. 2-Ohm Load: Minimum voltage is 33.4 Vrms (560W) with <0.5% THD for the CE 1000, and 44.1 Vrms (975W) with <0.5% THD for the CE 2000. You may need to adjust your variac back up to nominal line voltage during these tests. Place the sensitivity switch in the 26-dB position. Use a 60-Hz/7-kHz (stan dard SMPTE IM signal) input signal summed in a 4:1 ratio. Set the 60-Hz portion for 33.9 Vrms at the output of the channel under test for the CE 1000, or 40.8 Vrms at the output of the channel under test for the CE 2000. This is your 0-dB reference. Measure the I.M. distor tion. Check in -5 dB (power) steps until -35 dB is reached. Readings should be less than 0.1% at each level.

Rev. D CE Series Service Manual Type of Test Input Signal and Comments or Adjustment Load Parameters

12. Noise No Signal No Load 13. Crosstalk Check 20-kHz Sine Wave 8-ohm Load 14. Fan Operation 1-kHz Sine Wave 4-ohm Load Make sure the sensitivity switch is in the 26-dB posi tion and the level controls are fully clockwise. Terminate the input with a 600-ohm load. Using a 20 to 20,000- Hz bandpass filter, measure the noise on the output of the channel under test. Noise is measured relative to power output at 8-ohms (275 Watts (46.9 Vrms) for CE1000, 400 Watts (56.6 Vrms) for CE 2000) and should be at least 100-dB down from these numbers. Make sure the sensitivity switch is set in the 26-dB posi tion. Load each channel to 8-ohms. Insert a 20-kHz sine wave into channel 1 and adjust for 44.7 Vrms output. Terminate channel 2 input with 600 ohms. Measure less than 80 mVrms at the output of channel 2. (Greater than 55 dB down at 20-kHz) Move the input signal from channel 1 to channel 2 and the 600-ohm termination from channel 2 to channel 1. Ensure there is 44.7 Vrms at the output of channel 2. Measure less than 80 mVrms at the output of channel 1. Make sure the mode switch is in the “stereo” position. Plug a 1-kHz source into channel 1, 2 or both and ob serve the amplifier outputs with a voltmeter. Set the inputs so that about 10 Vrms is on the outputs and set the load to 4-ohms. If the amplifier produces power until the heatsinks get so hot that a channel goes into thermal protection, the fan is not working correctly. With the amplifier still in thermal protection, measure the voltage at J4 pin 1 (the red fan wire). If this voltage is greater than 20VDC, there is a problem in the wiring of the fan, or a problem with the fan itself. If the voltage is less than 20VDC, then the fan control circuit needs attention. U106 is a thermally controlled current source that is thermally connected to the heatsink. For channel 1, R190 develops a voltage across it due to this current, and this signal is OR’ed with the voltage from channel 2 and the transformer thermal switch. U4A is a DC amplifier that voltage amplifies the signal, and Q1 and Q2 current amplify this signal to drive the fan. If the heatsinks are hot, and U4-7 is negative, suspect U106, R191, R190, D119, R20, R21, R22, and U4. If the heatsinks are hot, and U4-7 is positive but U4-1 is low, suspect R23, R12, R11, and U4. If U4-1 is quite high (above 10V), but J4-1 is not the same voltage, Q1, Q2, R14, or R15 may be at fault. Maintenance 2-8

CE Series Service Manual Rev. D Type of Test Input Signal and Comments or Adjustment Load Parameters

15. Fault Jack No Signal No Load Post Testing Procedure Maintenance 2-9 Turn off the amplifier and set up the DMM to measure the voltage at U105-7. Turn on the amplifier and ob serve this voltage. Before the relays click in, U105-7 should be positive, and after they click in U105-7 should be negative. If this is not the case, suspect R179, and U105. For every condition that J5 presents an open circuit, the “fault” LED should blink, with one exception; when the amplifier is off, the LED cannot blink. Verify that when the amplifier is in its turn-on delay, the “fault” LEDs both blink. If they don’t, but the fault jack oper ates correctly, suspect D124, C122, R180, R182, R183, E102, E181, and R105. At the completion of testing, set all switches per cus tomer request. If none are specified by the customer, the following are standard factory settings for original shipment: Mode Switch: STEREO position. Input Sensitivity Switch: To 1.4V position. Level Controls: Both down (counter-clockwise) fully.

Rev. D CE Series Power Amplifier Service Manual

3 Circuit Theory 3.0 Overview This section of the manual explains the general opera tion of the CE power amplifier. Topics covered include Front End Operation, Voltage Amplification, Output Stage Topology, Protection Circuitry and Power Sup plies. For simplicity, the circuit theory will only refer to channel one. It may be assumed that channel two is identical to channel one. 3.1 Front End Operation The front end is comprised of three stages: Balanced Gain Stage (BGS), Variable Gain Stage (VGS) and the Error Amp. These front end stages are shown along with the rest of the amplifier in block diagram form in Figure 3.1. 3.2 Balanced Gain Stage (BGS) Input to the amplifier is balanced. The shield is iso lated from chassis ground by an RC network to inter rupt ground loops. The inverting (-) side of the bal anced input is fed to the non-inverting input of the first op-amp (U500-A) stage located on the input card. The non-inverting (+) side of the balanced input is fed to the inverting input of the first op-amp stage. Electri cally, the BGS is at unity gain. (From an audio per spective, however, this stage actually provides +6-dB gain if a fully balanced signal is placed on its input.) The BGS is a non-inverting stage. Its output is deliv ered to the Variable Gain Stage. 3.3 Variable Gain Stage (VGS) From the output of the BGS, the signal goes to the VGS where it is inverted and gain is determined by the position of the sensitivity switch (26 dB or 1.4V), and level is determined by the level control. The sensitivity switch allows for R505 to be either in or out of the local feedback path of U500-B. When R505 is out of the path (i.e. sensitivity switch in 1.4V position), and the gain of U500-B is greater than 1, the amplifier will produce full rated output when the amplitude of the input is 1.4 volts. Likewise, when the sensitivity switch is in the 26-dB position, R505 is in parallel with R506. This sets the gain of U500-B at 1.0 volt/volt. In

BGS VGS Error Amplifier Positive Driver Stage Positive Output Stage Amplifier Output

- + Audio Input - + + - Signal Translator LVA Bias Servo Positive Driver Stage Protection Circuitry Positive Output Stage Mute Circuitry

Negative Feedback (NFb) Figure 3.1 Block Diagram of CE Amplifier Circuit Operation Circuit Theory 3-1 CE Series Power Amplifier Service Manual Rev. D

this case, the gain of the VGS is unity and the amplifier will have an overall fixed gain of 20 volt/volt or 26- dB. The VGS is an inverting stage. 3.4 Error Amp The inverted output from the VGS is fed to the non inverting input of the Error Amp (U101-C) through an AC coupling capacitor C103 and input resistor R106. Diodes D103 and D104 prevent overdriving the Error Amp. Amplifier output is fed back via the negative feedback (NFb) loop through R112 and C106 (pre-ter minator network) and R322 (post-terminator network). The overall closed-loop mid-band gain is set to be 20 or 26 dB by resistors R112 and R110. The Error Amp's job is to keep both inputs at the same potential. Since the signal fed to the inverting input is 1/20 of the amplifier output, the Error Amp output should be the same as the non-inverting input, which should be 1/20 of the output of the amplifier during linear op eration (i.e., what goes in, comes out with gain). Any type of non-linearity in the output will cause the Error Amp to compensate with the opposite of the non-lin earity. For example, if the amplifier clips, the error amp will travel all the way to its opposite rail trying to com pensate. The output of the Error Amp, called the Error Signal (ES) drives the Voltage Translator (Q103). 3.5 Voltage Amplification The voltage amplification stage consists of the voltage translator, last voltage amplifier and the bias servo. Each of these items are discussed in this section. 3.5.1 Voltage Translator The Error Amp output is only capable of swinging sev eral volts and therefore must be voltage amplified to drive the output stage. The purpose of the voltage trans lator, Q103, is to level shift or translate the voltage from a reference around ground to a reference just above -Vcc. The result is higher voltage swing capabilities from the LVA. This is required since the next stage is referenced to -Vcc. The diode D105 protects the volt age translator from reverse biasing. 3.5.2 Last Voltage Amplifier (LVA) The next stage is the Last Voltage Amplifier Q107. The LVA provides voltage gain necessary to provide drive to the output stage. R115 in the base of Q107 pro vides collector current for Q103, the voltage translator, and it also allows the signal of the collector of Q107 to be developed across it and thus amplified. The series combination of D126 and D127, in parallel with the base-emitter junction of Q107 and R136, form a circuit that limits the current through Q107. One of these diode drops equates to the base-emitter junc tion of Q107, and the other equates to the voltage on R136. Therefore, the current through Q107 cannot rise higher than that required to produce a diode drop across R136. 3.5.3 Bias Servo Q104, R132, R133 and R134 form the bias servo. This circuit is also known as a VBE Multiplier or a level shifter. Q104 is called the bias transistor. The purpose of this circuit is to provide and control bias to the output stage. By utilizing the constant current source Q105, the bias servo effectively multiplies the voltage across the bias transistors base-emitter junction and produces the out put voltage across the bias transistors collector-emit ter junction. The bias adjustment pot R134 is included to allow adjustment of the bias voltage. The bias transistor is mounted on the main module and thermally connected to the heatsink. The purpose of this is to allow the bias transistor to automatically adjust the bias voltage as needed depending on the temperature of the output devices. This is possible because the forward voltage drop across a P-N junc tion decreases by approximately 2 mV for every 1° C increase in temperature. 3.6 Output Topology The output topology for the CE series amplifiers is a type of quasi-complementary design using only N-P-N output devices. They also have the classic CROWN AB+B biasing configuration also known as MultiMode® or triple-deep Darlington. The pre-drivers and drivers are biased at 0.6V and the output transistors have a 0.31VDC voltage from base-emitter and are therefore at a sub-turn-on voltage. In this type of topology (AB+B), the driver transistors carry the bias current, while the output transistors sense when the drivers have devel oped significant current, and thus take over and de liver the needed current. This is a proven design that provides maximum efficiency with minimum crossover notch distortion and idling amplifier heat. Thus there is no bias current adjustment, as the output circuit is not temperature-tolerance critical. This output topology has become quite common in power amplifier design. Typical Darlington transistors, connected in the Common Emitter configuration, are used

Circuit Theory 3-2 Rev. D CE Series Power Amplifier Service Manual

when extremely high input resistance and very high hfe (cur rent gain) are required. Figure 3.1 includes the block dia gram of the output stage. The output stages can be further broken down by Pre-driver, Driver, Output Devices, Flyback Diodes and Output Terminating Network. Be sure when replacing the heatsink that the nuts are torqued properly. The heatsink receives its power through these nuts, and without them being torqued properly, the amplifier will not function correctly. 3.6.1 Pre-Driver There is both a positive side pre-driver Q110 and a negative side pre-driver Q120. The level-shifted signal from Q107 is applied directly to the base of Q110 where it is current am plified. The level shifted signal applied to the base should be symmetrical relative to 0 VDC plus the DC offset re quired to bias on Q110 and the driver. The positive pre driver is connected as an emitter-follower stage with no sign inversion; the negative side must provide sign inversion and level shifting so that the driver can be referenced to the negative rail. Thus, the output is taken off of the collector. 3.6.2 Driver The positive side driver, Q112, is driven by the pre-driver, Q110. Likewise, the negative side driver, Q121, is driven by the negative pre-driver, Q120. The Class AB+B nature of the output stage means that the drivers are on as Class AB devices, and the amount of bias can be measured across R150 or R165. The resistors R150 and R165 are called the bias resistors because they are connected directly across the base-emitter junction of the output devices. 3.6.3 Output Devices The output devices, Q114-Q119 on the positive side and Q123-Q128 on the negative side are driven directly from the emitters of the respective drivers. The most important char acteristic between output devices is their ability to share current handling. In ideal current sharing all of the output devices produce the same amount of current; that is, no one output device works more than or less than any other output device. However, not all transistors have identical current gain. This is why, for optimum performance, it is absolutely critical that the output devices be matched. When the output devices are matched, they will have current gains that are very similar. To ensure optimal performance, num bered devices should only be ordered from the Crown Ser vice Department. 3.6.4 Flyback Diodes D114 and D115 are called flyback diodes. In the event that a back EMF (flyback) pulse exceeds the power supply volt age, the flyback diode will shunt this voltage to the supply in order to protect the output devices. 3.6.5 Output Terminating Network R158, L102 and C118 form the output terminating network. This network serves several functions. It allows the amplifier to better drive very reactive loads and improves amplifier stability. 3.7 Power Supply There is one current source and three different power sup plies in the CE series amplifiers: the low-voltage supply, bootstrap supply and the high-voltage supply. Each of these circuits will be discussed in this section. 3.7.1 Low Voltage Supply The low-voltage supply is a bipolar supply producing +15V and -15V via two three-terminal regulators. The source of AC voltage comes from special taps on the main transformer. This type of low-voltage supply produces an extremely stable and dependable voltage source for all of the low-voltage circuitry. 3.7.2 Bootstrap Supply The bootstrap supply is a voltage doubler network that con sists of C1, C3, D6 and D7. The AC leg of the secondary is applied to R1, which limits the current. Since the voltage at +Vcc is tied through D6, the voltage on C1+ can be no lower than +Vcc - 0.7V so the voltage of C1+ will be +Vcc - 0.7VDC when there is no input on WP6. As the voltage on WP6 goes positive, C1- rises, minus the voltage drop on R1, and therefore, C1+ rises relative to ground by the same amount. D7 will conduct, charging C3+. As WP6 completes its cycle and goes negative, D7 prevents the charge built up on C3 from travelling back to C1. So, every positive cycle of WP6 adds charge up to the point that C3+ reaches twice WP6 peak minus the drop on R1. The voltage devel oped at C3+ has a significant amount of ripple, and that ripple is not equal in amplitude to that on +Vcc. R2 provides a current path and isolation between the voltage required (HI-V) and that on C3+. D8 (10V Zener) is placed be tween HI-V and +Vcc to limit HI-V to +Vcc +10VDC. The purpose of this supply is prevent the bias string from limiting the rail voltage. If the top of the bias string was connected to the positive rail voltage, the current required for bias flowing through a resistor to create a

Circuit Theory 3-3 CE Series Power Amplifier Service Manual Rev. D

current source would drop enough voltage to require a higher rail voltage. This would increase the dissipation of the out puts since they would never reach this voltage. By using a bootstrap supply, the bias string never limits the available voltage swing of the amplifier. 3.7.3 High Voltage Supply The high voltage supply is bipolar and produces the rail voltages +Vcc and -Vcc. It is full-wave rectified and capaci tively filtered. The transformer scales the line voltage to the voltages required by the amplifier. It also provides isolation between the line voltage appearing at the primary winding of the transformer and the rest of the amplifier. 3.7.4 Constant Current Source Q105 and R135 form a constant current source utilizing the bootstrap supply HI-V and the rail voltage +Vcc. This source is derived from the difference between HI-V and +Vcc (which is +10V) being developed across R135 and Q105 base emitter junction. Since this difference is presented across the base-emitter junction, the ripple of HI-V relative to +Vcc must be zero for a constant current to be produced. An other very important component is C138. C138 overpowers the base-collector capacitance of Q105. This ensures that the slew limit of the LVA is set by a more constant capaci tance rather than one that is much more variable with the applied voltage. This lowers distortion by making the rate of change of the waveform less dependent on the output volt age. CONDITIONS Turn-On Delay Heatsink The constant current source is required for proper operation of the bias servo circuit. It also helps to provide isolation between the front end input stage supply and the rail volt age. 3.8 Protection Circuitry The CE series of amplifiers are equipped with a great deal of protection circuitry to protect the amplifier under a wide and varied array of fault conditions. Each of the fault condi tions and fault circuitry will be reviewed in this section. Also, the CE amplifiers provide an output fault connector to allow remote monitoring of the amplifier’s condition. This remote fault connector will also be covered. A block diagram of the Protection Circuitry Logic is shown in Figure 3.2. 3.8.1 Time Dependent VI Limit There is a special type of VI limiting in the CE amplifiers. It is called Time Dependent VI limiting. While most current limit ing circuitry is independent of frequency, that is, it limits VI regardless of what the frequency is, Time Dependent VI limiting will actually adjust the VI limiting of the amplifier based on the frequency of the signal. The time/frequency dependence of the limiter also allows for higher, non-repetitive peak-currents than is allowed for continuous wave output signals. The result is an amplifier more suited to reproducing music. FAULT PROTECTION Output Relay Mute Input

Fan Speed Control Temperature Transformer Temperature LF and Short Circuit Fault Condition Mute Fault LED Auxiliary Output Jack

Circuit Theory 3-4 Figure 3.2 Block Diagram of Protection Circuitry Logic

Rev. D CE Series Power Amplifier Service Manual

The VI circuitry first senses the output current from the current sense resistors R152 and R301 on the positive side, and R159 and R300 on the negative side. This voltage is then fed to the limiting transistors Q108 and Q109. Before the output current becomes dangerously high, the limiting transistor is activated, which in turn limits the drive voltage at the base of the pre-driver. When the pre-driver current and the limiter current are equal to the current available from the constant current source, a limit point is reached, and the protection cir cuitry remains in this state until the overload is removed. The frequency dependence of the circuitry comes from the capacitors C113 and C114. The resistors R140 through R143 are referenced to ground and only affect current limit when the output voltage is higher than ground. The resistors also serve to drain the charge from C113 and C114, thus increasing the current limit as the output voltage is increased. The diodes D113 and D114 serve to block voltage during opposing cycles so that the positive current limit circuitry is not affected by negative output signals and vice-versa. The VI lim iter is pre-biased by R317 and R318. This is done so that less current in the output stage is required to acti vate it. 3.8.2 Temperature Protection There are three different temperatures that are moni tored on the CE amplifiers; the transformer tempera ture and both channel 1 and 2 heat-sink temperature. The transformer temperature is monitored by an inter nal thermal switch which is closed (shorted) during normal operation. When the transformer reaches its thermal limit, the switch opens to protect the trans former, the fan speed is turned to full, and the relay K100 is turned on, thereby isolating the load from the output of the amplifier. When the relay K100 is turned on, the mute circuitry is simultaneously activated. The mute circuitry will effectively steal the drive from the error amp. Essentially, the amplifier is safely shut down until the transformer is cool enough for the thermal switch to close. The heatsink temperature is reported via U106. This device delivers a current proportional to the absolute temperature that is set to 1 µA per °K of heatsink tem perature by R191. (U106 is attached to the heatsink with electrically insulating and thermally conducting epoxy.) This current is delivered through R190 to de velop a voltage at the anode of D119. This voltage is then used to adjust fan speed control, and will also activate relay K100 and the mute circuitry if the heatsink reaches dangerous levels. 3.8.3 Low-Frequency and Short-Circuit Protection The output of the error amp is monitored by the win dow comparator, U102-B. The window comparator is designed to detect a LF (Low Frequency) condition. When this condition is detected, the comparator U5-A changes state and the amplifier goes into fault mode. If the output signal remains in a DC condition for enough time to charge C123 through R185 to a value above the threshold of the bilateral switch Q132, then Q132 will conduct and turn on TRIAC Q131. Q131 will remain on until the voltage at Q131-2 reaches within a few volts of ground and C123 discharges enough to turn Q132 off. The detection circuit of C123 and R185 is designed to only allow Q131 to turn on during a fault condition, but it is possible to trip the circuit with a rail to-rail square wave of 5-Hz. If an output device faults, typically the rail will short through the output device to the output. Q131 will then turn on and short the rail through the shorted output to ground. This will prevent the DC voltage from destroying the load. R184 is used as a path to ground for any leakage current from Q132 that may build up charge on Q131-G. 3.8.4 Input Compressor The output of the error amp is monitored by the win dow comparator, U102-D. Since the gain from the error amplifier output is fixed at 20, the maximum amplitude of the error amplifier is known, and any clipping will cause the error amplifier to exceed this maximum value. The window is designed to detect this maximum value plus a predetermined tolerance. When this value is exceeded, the output of the comparator goes low. U101-D, Q100 and U100 are the major components comprising a fast-attack, slow-decay circuit used to compress the signal coming out of the VGS. This com pression action only occurs when the output of the com parator, U102-D, detects clipping on the output of the error amp. It is important to note that in the event of a signal being clipped at the error amp, not only is the compressor activated, but, the red clip LED is also turned on. In this way the amplifier will not produce a distorted output, but will visually inform the user that the input signal is too large and is being compressed.

Circuit Theory 3-5 CE Series Power Amplifier Service Manual Rev. D

3.8.5 Turn-On Delay U104-A provides a time delay after turn-on to let the rails stabilize before connecting the load to the ampli fier output. The block diagram in Figure 3.2 shows that, while the turn-on delay circuit is active, the amplifier is in fault mode. 3.8.6 Output Relay Muting The relay K100 is in series with the output of the ampli fier. The relay coil is connected to U104-A, U104-B and U104-C; these inputs determine if the relay should be open (disconnecting the load from the amplifier) or closed. The fault conditions which drive the relay in puts are outlined in Figure 3.2 and listed here. 1. Heat sink exceeds thermal limit 2. Transformer exceeds thermal limit 3. A short has been applied to the output 4. There is DC on the output 5. The turn-on timer has not released the relay yet 3.8.7 Input Muting The summed output from U104 -A,B,C is also used to drive an inverter, U104-D, that mutes the input to the error amplifier via Q133. Q133 is a FET, which can open faster than the relay can. This saves the relay, K100, from having to switch high currents which can erode the contact surfaces. 3.8.8 Auxiliary Output Jack The auxiliary output jack allows for remote monitoring of the amplifier’s fault status. The concept of the aux iliary output jack is to short two pins of a common RJ 11 connector (J5) together through a transistor any time that the amplifier is operating normally. If the am plifier is off or in any fault condition, the two pins on J5 will effectively be an open circuit. 3.9 Fan Control Circuitry There are two different kinds of input to the fan speed control. One is the heatsink temperature and the other is the input from the transformer thermal switch. The heatsink temperature is reported via U106, which is thermally connected to the heaksink. The current from U106 is delivered through R190 to develop a voltage at the anode of D119. D119 is used as part of an OR gate with channel 2 and with the transformer thermal sense. As the reported heatsink and/or transformer tempera ture rises, the Darlington transistors, Q1 and Q2, are turned on harder. So, a thermally proportional volt age is supplied to the fan, allowing it to run faster as the reported temperatures increase. However, if all of the reported temperatures are below a set threshold level, the transistors Q1 and Q2 will be biased off, hence cutting off the supply voltage to the fan. This results in lower power consumption and lower noise levels during times of low-power operation.

Circuit Theory 3-6 Rev.D CE Series Service Manual

4 Neutrik Connectors The CE-Series of amplifiers uses Neutrik Speakon connectors for the outputs. While the Reference Manual contains detailed instructions on how to as semble these connectors, we thought we would in clude the information here as well. This may help in troubleshooting problems that may have arisen from incorrect assembly. Fig. 4.1 Order of Assembly for the Neutrik Speakon NL4FC Connector You will need two (2) Neutrik Speakon® NL4FC con nectors to interface with this amplifier.* You will also need high-quality two- or four-conductor speaker cable with the appropriate end-connectors to fit the inputs on your speakers, a pair of needle-nosed pliers and a 1.5-mm hex key to assemble the Speakon con nectors. To assemble the Neutrik Speakon NL4FC connector, complete the following steps: Slide the bushing (E) and chuck (D) onto the end of the cable as shown (Figure 4.1).** Strip approximately 3/4-inch (19-mm) of casing from the cable end. Strip approximately 1/4-inch (6-mm) from the end of each of the conductors down to bare wire. Slide the end sleeves (C) onto the wire ends and crimp in place. * You can purchase the Speakon® NL4FC connectors from your local dealer, or contact NEUTRIK AG, Im alten riet 34, Schaan FL-9494, Furstentum Liechtenstein, 011-41-75-237-2424, FAX 011-41-75-232- 5393, neutrik.com or Neutrik USA, Inc., 195 Lehigh Ave., Lake wood, NJ 08701-4527, (908) 901-9488, Fax (908) 901-9608, neutrikusa.com or Crown International, Inc., 1718 West Mishawaka Road, Elkhart, IN 46517-4095, USA, 219-294-8000, FAX 219-294-8329, crownaudio.com. ** Your NL4FC connector kit should contain both a black and a white chuck. Use the white chuck for cable with a diameter of 0.25- to 0.5- inch (6.35- to 12.7 mm). Use the black chuck for cable with a diameter of 0.375- to 0.625-inch (9.525- to 15.875-mm). Fig. 4.2 Wiring for the Neutrik Speakon NL4FC Connector Insert each wire with end sleeve into the top of appro priate slot of the connector insert (B) as shown in Fig ure4.2. Use a 1.5-mm hex key inserted into each side slot to tighten the connection. If the Mode switch is in the “Stereo” position (for ste reo configuration), connect the positive (+) and negative (–) leads of each wire to the appropriate Channel 1 and Channel 2 connectors as shown in Figure 4.3. You may use all 4 poles of the Channel 1 output connector to feed both speakers, if you wish. Fig. 4.3 Stereo Output Wiring If the Mode switch is in the “Bridge” position (for mono configuration), connect the load across the (+) terminals of the connector as shown in Figure 4.4. For Bridge-Mono Mode, non-inverting output, Ch1+ is the positive (+) and Ch2+ is the negative (–). Fig. 4.4 Bridge-Mono Output Wiring

Neutrik Connectors 4-1 CE Series Service Manual Rev. D

Never short or parallel the output channels of a CE-Series amplifier to itself or any other amplifier. Slide the connector insert (B) into the connector housing (A), making sure that the large notch on the outer edge of the insert lines up with the large groove on the inside of the connector housing. The insert should slide easily through the housing and out the other side until it extends approximately 3/4-inch (19- mm) from the end of the housing (see Figure 4.5). Fig. 4.5 Detailed Neutrik Speakon NL4FC Connector Assembly: Insert into Connector Housing Slide the chuck (D) along the cable and insert into the housing, making sure that the large notch on the outer edge of the chuck lines up with the large groove on the inside of the connector housing. The chuck should slide easily into the insert/housing combination until only approximately 3/8-inch (9.5-mm) of the chuck end extends from the back end of the connector as shown in Figure 4.6. Fig. 4.6 Detailed Neutrik Speakon NL4FC Connector Assembly: Chuck into Connector Housing Fig. 4.7 Detailed Neutrik Speakon NL4FC Connector Assembly: Bushing onto Connector Housing Assembly Slide the bushing along the cable and screw onto the end of the connector combination as shown in Figure 4.7. Note that the bushing features a special locking con struction which will prevent disassembly of the NL4FC connector once this cap is tightened into place. Before tightening, you may want to test the connector to make sure it has been assembled properly. Why Speakon? For amplifiers, the most popular termination device on professional products has been the dual banana (which incidentally was pioneered by Crown with the DC-300 model). However, recent regulatory requirements in Eu rope have outlawed the use of the dual banana plug and forced users to terminate speaker cables with spade lugs or bare ends—an approach that is clearly not ad vantageous to the customer who wants to reconfigure his system or quickly change out a defective product. It is possible that similar regulatory controls will appear worldwide over the next few years. One solution to this problem is to use the Neutrik Speakon® connector. Here at Crown, we wanted to de velop a system for you that eliminated the need for spe cialized, time-consuming, interface cables. The major loudspeaker manufacturers have been using Speakon connectors for the input termination on their products for several years now, so you can be assured of the connector’s reliability in the workplace. With Speakon connectors, you can plug straight from the amp to the speaker, and start making those great sounds right away. The Speakon connector used on this amplifier meets all known safety regulations. Once wired correctly, the con nector cannot be plugged in backwards, causing the type of inverted polarity situations that are common with banana hookups. It will provide a safe, secure and reli able method of interfacing your amplifier to the load.

Neutrik Connectors 4-2 PART II Component Documentation CE Series Service Manual Rev. D This page left intentionally blank Parts 5-2 Rev. D CE Series Service Manual

5 Parts 5.1 General Information This section contains an overview of the procedure for ordering parts from Crown's service department. The following section, Section 6, includes schemat ics used for referencing the circuit board components, exploded views, and parts lists. Most mechanical and structural items are illustrated and indexed in the exploded view drawings. Where electronic parts are shown in these drawings, the sche matic designations are also given. Electronic parts located on printed circuit boards are illustrated by schematic symbols on the trace side and by component shape symbols on the compo nent side. Where applicable, quantities of parts are also given. 5.2 Standard and Special Parts Many smaller electrical and electronic parts used in the CE-Series amplifiers are stocked by, and avail able from, electronic supply houses. However, some electronic parts that appear to be standard are actu ally special. Graded and matched output transistors should always be purchased from Crown Audio. A part ordered from Crown will assure an acceptable replacement. Structural items such as covers and panels are available from Crown only. 5.3 Ordering Parts When ordering parts, be sure to give the amplifier model and serial number and include a description and the Crown Part Number (CPN) from the parts list ing. Price quotes are available on request. 5.4 Shipment Shipment will be normally made by UPS or best other method unless you specify otherwise. Shipments are made to and from Elkhart, IN, only. Established ac counts with Crown will receive shipment freight pre paid and will be billed. All others will receive ship ment on a C.O.D. or pre-payment (check or credit card) basis. 5.5 Terms Normal terms are pre-paid. Net-30 days applies to only those firms having pre-established accounts with Crown. If pre-paying, the order must be packed and weighed before a total bill can be established, after which an amount due will be issued and shipment made upon receipt of pre-payment. New parts re turned for credit are subject to a 10% re-stocking fee. Authorization from the Crown Parts Department must be obtained before returning parts for credit. Crown is not a general parts warehouse. Parts sold by the Crown Parts Department are solely for servic ing Crown products. Part prices and availability sub- t prices and availability sub ject to change without notice. ject to change without notice.

To order parts... Call the Crown Parts Department at: Ph. (574) 294-8200 Toll Free: (800) 342-6939 Fax: (574) 294-8124 Parts 5-3 CE Series Service Manual Rev. D This page left intentionally blank Parts 5-4 Rev. D CE Series Service Manual 6 Exploded Views, Parts Lists Exploded Views 6-1 CE Series Service Manual Rev. D See illustration on next page (102632). Obtain CPNs (Crown Part Numbers) from the bill of material following the illustra tion. The CPNs on the illustration may not be up-to-date. Notes: 1) Item 1 assy. is shown with heatsink assys. removed in order to provide clarity. Assy. CE 1000 Domestic Exploded Views 6-2 Rev. D CE Series Service Manual Assy. CE 1000 Domestic Item Qty. Description CPN 1 1 Chassis, CE 1000/CE 2000 WELD 133817-1 2 8 6-32 x .312 PNHD TORX TFS SEM BZ 102884-1 3 1 Fan, 120 x 120 x 38mm 24VDC NMB old 125400-2 3 1 Fan, 120 x 120 x 38mm 24VDC 140CFM new 133551-1 4 1 Guard, Fan 102649-1 5 4 8-32 x 1.844 FLT HD PH BLK STL 103281-1 6 1 Input Assembly, CE1000 Standard 126773-4 7 4 M2.9 x 9.5mm FLT HD PH TFS BZ AB 103175-1 8 1 IEC Snap IN 15A UL/10A VDE 102650-1 9 1 #10 INT Tooth Lockwasher Zinc A10094-8 10 1 Wire, 14 GRN #10 Ring x 5 x FLAG A12119- K050M 11 2 10-32 Hex Nut w/Belle A10056-3 12 1 35A 400V Bridge Rectifier C 8752-2 13 4 #10 NYL SHLDR Washer #10-375-A A10099-7 14 4 10-32 x 2.875 PAN HD PH MSCR 125105-1 15 1 Cover, CE 1000/CE 2000 Top PC 133824-1 16 1 XFMR, CE 1000 120V 60HZ 101180-2 17 1 BRKR, 1 Pole 12A Snap-in 102640-1 18 1 Overlay, CE 1000 Bottom Front 102651-5 19 1 Switch, Rocker SPST 22A CHAS MT 126459-1 20 1 Overlay, CE 1000/CE 2000 Top Front 128284-1 21 2 Knob, CE 1000/CE 2000 Gain Rubberized 102657-1 22 X Permalock MM-115 S 2217-8 Exploded Views 6-3 CE Series Service Manual Rev. D 4 5 Note: Item 1 is shown with front face plate removed in order to provide clarity. Assy. CE 1000 PWA & Chassis Exploded Views 6-4 Rev. D CE Series Service Manual Assy. CE 1000 PWA & Chassis Item Qty. Description CPN 1 1 Chassis, CE 1000/CE 2000 WELD/AP/PC/SP 133817-1 2 1 PWA, CE1000 MAIN 127451-4 3 8 6-32 X .25 Torx Pnhd Nylon 132240-10604 4 1 Blank Plate 126730-1 5 2 Screws 126979-1 Exploded Views 6-5 CE Series Service Manual Rev. D

See illustration on next page (133695-1).HS Assy. CE 1000 Isolated Ch.1

Exploded Views 6-6 Rev. D CE Series Service Manual HS Assy. CE 1000 Isolated Ch.1 Item Qty. Description CPN 1 1 Heatsink, CE1000 102606-6 2 1 2SC5242 NPN 230V 15A 30MHZ 103200-1 3 1 M3 x 10 TFS 6-32 TORX PNHD SEM BZ 103233-1 4 2 4-40 x .437 TORX PAN HD TFS SEM 126785-1 5 2 NYL .115 SHLDR WSHR 126017-2 6 1 Wire, BLK 5" 6 RING x .25 FAST A11389-A050K 7 1 Isolator, TO-3 0.16 GOLD C/W 102577-1 8 6 6-32 x .312 TORX PAN HD TFS 102719-1 9 4 NPN, TO-3 MJ21194 PWR 102659-1 Exploded Views 6-7 CE Series Service Manual Rev. D See illustration on next page (102570-3). . HS Assy. CE 1000 Isolated Ch.2 Exploded Views 6-8 Rev. D CE Series Service Manual HS Assy. CE 1000 Isolated Ch.2 Item Qty. Description CPN 1 1 Heatsink, CE1000 102606-7 2 1 2SC5242 NPN 230V 15A 30MHZ 103200-1 3 1 M3 x 10 TFS 6-32 TORX PNHD SEM BZ 103233-1 4 4 NPN, TO-3 MJ21194 PWR 102659-1 5 6 6-32 x .312 TORX PAN HD TFS 102719-1 6 1 Isolator, TO-3 0.16 GOLD C/W 102577-1 7 1 Wire, BLK 5" 6 RING x .25 FAST A11389-A050K 8 2 NYL .115 SHLDR WSHR 126017-2 9 2 4-40 x .437 TORX PAN HD TFS SEM 126785-1 Exploded Views 6-9 CE Series Service Manual Rev. D

See illustration on next page (133696-1).HS Assy. CE 1000 Non-isolated Ch.1

Exploded Views 6-10 Rev. D CE Series Service Manual HS Assy. CE 1000 Non-isolated Ch.1 Item Qty. Description CPN 1 1 Heatsink, CE1000 102606-6 2 1 2SC5242 NPN 230V 15A 30MHZ 103200-1 3 1 M3 x 10 TFS 6-32 TORX PNHD SEM BZ 103233-1 4 6 6-32 x .312 TORX PAN HD TFS 102719-1 5 2 4-40 x .437 TORX PAN HD TFS SEM 126785-1 6 4 NPN, TO-3 MJ21194 PWR 102659-1 Exploded Views 6-11 CE Series Service Manual Rev. D

See illustration on next page (102572-3).HS Assy. CE 1000 Non-isolated Ch.2

Exploded Views 6-12 Rev. D CE Series Service Manual HS Assy. CE 1000 Non-isolated Ch.2 Item Qty. Description CPN 1 1 Heatsink, CE1000 102606-7 2 1 2SC5242 NPN 230V 15A 30MHZ 103200-1 3 1 M3 x 10 TFS 6-32 TORX PNHD SEM BZ 103233-1 4 4 NPN, TO-3 MJ21194 PWR 102659-1 5 6 6-32 x .312 TORX PAN HD TFS 102719-1 6 2 4-40 x .437 TORX PAN HD TFS SEM 126785-1 Exploded Views 6-13 CE Series Service Manual Rev. D See illustration on next page (102634). Obtain CPNs (Crown Part Numbers) from the bill of material following the illustra tion. The CPNs on the illustration may not be up-to-date. Notes: 1) Item 1 assy. is shown with heatsink assys. removed in order to provide clarity. Assy. CE 2000 Domestic Exploded Views 6-14 Rev. D CE Series Service Manual Assy. CE 2000 Domestic Item Qty. Description CPN 1 1 Chassis, CE1000/CE2000 WELD 133817-1 2 8 6-32 x .312 PNHD TORX TFS SEM BZ 102884-1 3 1 Fan, 120 x 120 x 38mm 24VDC 118CFM 133551-1 4 1 Guard, Fan 102649-1 5 4 8-32 x 1.844 FLT HD PH BLK STL 103281-1 6 1 Input Assembly, CE1000 Standard 126773-4 7 4 M2.9 x 9.5mm FLT HD PH TFS BZ AB 103175-1 8 1 IEC Snap In 15A UL/10A VDE 102650-1 9 1 #10 INT Tooth Lockwasher Zinc A10094-8 10 1 Wire, 14 GRN #10 Ring x 5 x FLAG A12119- K050M 11 2 10-32 Hex Nut w/Belle A10056-3 12 1 35A 400V Bridge Rectifier C 8752-5 13 4 #10 NYL SHLDR Washer #10-375-A A10099-7 14 4 10-32 x 2.875 PAN HD PH MSCR 125105-1 15 1 Cover, CE 1000/CE 2000 Top PC 133824-1 16 1 BRKT, CE 2000 XFMR TOP AP 133820-1 17 1 XFMR, CE 2000 120V 60HZ 101181-3 18 1 Gasket, CE 2000 XFMR .125 THK SIL Rubber 125488-1 19 1 BRKR, 1 Pole 18A Snap-in 102641-1 20 2 10-32 x .375 PAN HD PH SEM BZ 102720-1 21 1 Overlay, CE 2000 Bottom Front 102652-5 22 1 Switch, Rocker SPST 22A CHAS MT 126459-1 23 1 Overlay, CE 1000/CE 2000 Top Front 128284-1 24 2 Knob, CE 1000/CE 2000 Gain Rubberized 102657-1 25 X Permalock MM-115 S 2217-8 Exploded Views 6-15 CE Series Service Manual Rev. D Note: Item 1 is shown with front face plate removed in order to provide clarity. Assy. CE 2000 PWA & Chassis Exploded Views 6-16 Rev. D CE Series Service Manual Assy. CE 2000 PWA & Chassis Item Qty. Description CPN 1 1 Chassis, CE 1000/CE 2000 WELD/AP/PC/SP 125612-2 2 1 PWA, CE 2000 Main 102140-6 3 8 MSCR, 6-32X.25 TORX PNHD NYLON 132240-10604 Exploded Views 6-17 CE Series Service Manual Rev. D

See illustration on next page (133697-1).HS Assy. CE 2000 Isolated Ch.1

Exploded Views 6-18 Rev. D CE Series Service Manual HS Assy. CE 2000 Isolated Ch.1 Item Qty. Description CPN 1 1 Heatsink, CE 2000 102607-6 2 1 2SC5242 NPN 230V 15A 30MHZ 103200-1 3 1 M3 x 10 TFS 6-32 TORX PNHD SEM BZ 103233-1 4 6 NPN, TO-3 MJ21194 PWR 102659-1 5 10 6-32 x .312 TORX PAN HD TFS 102719-1 6 2 4-40 x .437 TORX PAN HD TFS SEM 126785-1 7 2 NYL .115 SHLDR WSHR 126017-2 8 1 Wire, BLK 5" 6 RING x .25 FAST A11389-A050K 9 1 Isolator, TO-3 0.16 GOLD C/W 102577-1 Exploded Views 6-19 CE Series Service Manual Rev. D

See illustration on next page (102574-3).HS Assy. CE 2000 Isolated Ch.2

Exploded Views 6-20 Rev. D CE Series Service Manual HS Assy. CE 2000 Isolated Ch.2 Item Qty. Description CPN 1 1 Heatsink, CE 2000 102607-7 2 1 2SC5242 NPN 230V 15A 30MHZ 103200-1 3 1 M3 x 10 TFS 6-32 TORX PNHD SEM BZ 103233-1 4 6 NPN, TO-3 MJ21194 PWR 102659-1 5 10 6-32 x .312 TORX PAN HD TFS 102719-1 6 2 4-40 x .437 TORX PAN HD TFS SEM 126785-1 7 2 NYL .115 SHLDR WASHER 126017-2 8 1 Wire, BLK 5" 6 RING x .25 FAST A11389-A050K 9 1 Isolator, TO-3 0.16 GOLD C/W 102577-1 Exploded Views 6-21 CE Series Service Manual Rev. D

See illustration on next page (133698-1).HS Assy. CE 2000 Non-isolated Ch.1

Exploded Views 6-22 Rev. D CE Series Service Manual HS Assy. CE 2000 Non-isolated Ch.1 Item Qty. Description CPN 1 1 Heatsink, CE 2000 102607-6 2 1 2SC5242 NPN 230V 15A 30MHZ 103200-1 3 1 M3 x 10 TFS 6-32 TORX PNHD SEM BZ 103233-1 4 6 NPN, TO-3 MJ21194 PWR 102659-1 5 10 6-32 x .312 TORX PAN HD TFS 102719-1 6 2 4-40 x .437 TORX PAN HD TFS SEM 126785-1 Exploded Views 6-23 CE Series Service Manual Rev. D

See illustration on next page (102576-3).HS Assy. CE 2000 Non-isolated Ch.2

Exploded Views 6-24 Rev. D CE Series Service Manual HS Assy. CE 2000 Non-isolated Ch.2 Item Qty. Description CPN 1 1 Heatsink, CE 2000 102607-7 2 1 2SC5242 NPN 230V 15A 30MHZ 103200-1 3 1 M3 x 10 TFS 6-32 TORX PNHD SEM BZ 103233-1 4 6 NPN, TO-3 MJ21194 PWR 102659-1 5 10 6-32 x .312 TORX PAN HD TFS 102719-1 6 2 4-40 x .437 TORX PAN HD TFS SEM 126785-1 Exploded Views 6-25 CE Series Service Manual Rev. D Assy. CE 1000 Domestic (using PWA 102139-8) Refer to drawing on page 6-2. Item Qty. Description CPN 1 1 Assy, CE1000 PWA & Chassis 1 PWA, CE1000 Main/Input 102139-8 1 Chassis, CE1000/CE2000 125612-3 [NOW 133817-1] 2 8 Screw, 6-32X.312 Torx Pnhd Sem 103433-70605 3 1 Fan, 120 x 120 x 38mm 24VDC 140CFM 133551-1 4 1 Guard, Fan 102649-1 5 4 8-32 x 1.844 FLT HD PH BLK STL 103281-1 6 1 Asm, CE1000/CE2000 Input 126773-3 7 4 M2.9 x 9.5mm FLT HD PH TFS BZ AB 103175-1 8 1 IEC Snap IN 15A UL/10A VDE 102650-1 9 1 [was #10 INT Tooth Lockwasher Zinc [ was A10094-8] 10 1 Wire, 14 GRN Flagx5xring A12119-M050N 11 2 8-32 Hex Nut w/Belle A11056-2 12 1 35A 400V Bridge Rectifier C 8752-2 13 4 #10 NYL SHLDR Washer #10-375-A A10099-7 14 4 10-32 x 2.875 PAN HD PH MSCR 125105-1 15 1 [was Cover, CE 1000/CE 2000 Top PC} [was 125178-1] 16 1 XFMR, CE 1000 120V 60HZ 101180-2 17 1 BRKR, 1 Pole 12A Snap-in 102640-1 18 1 [was Overlay, CE 1000 Bottom Front] [was 102651-2] 19 1 Switch, Rocker SPST 22A CHAS MT C10228-2 20 1 [was Overlay, CE 1000/CE 2000 Top Front] [was 125349-1] 21 2 [was Knob, CE 1000/CE 2000 Gain Rubberized] [was 102657-1] 22 X [was Permalock MM-115] [was S 2217-8] Exploded Views 6-26 Rev. D CE Series Service Manual Assy. CE 1000 Domestic (using PWA 102139-8) continued Parts NOT shown in drawing on page 6-2: Item Qty. Description CPN 1 Wire, 14 blk fast fast x 4.0 x flag A11384-C040M 1 Wire, 14 blk fast x 14 x tab A11384-C140N 1 Wire, 14 blk flag x 14 x flag A11384M140M 1 Wire, 14 grn #8ring x 5 x flag A12119-N050M 3 Tie, cable 4" or more 18 lb C 1811-6 X Threadlocker, Titan 7242 50 ML S 2217-8 4 Screw, 6-32X.312 Torx Pnhd Sem 103415-70605 8 Mscr, 6-32x.25 Torx Pn Hd Sem 103435-70604 1 Serffan 120x120x38mm24VDC118CFM 125400-1 1 Chas, CE1000 PWA & 125432-4 1 Clip, D390 Breaker Mounting 125476-2 1 Switch, rocker SPST 22A Chas Mt 126459-1 Exploded Views 6-27 CE Series Service Manual Rev. D Assy. CE 1000A Domestic (using PWA 102139-8) Refer to drawing on page 6-2. Item Qty. Description CPN 1 1 Assy, CE1000 PWA & Chassis 1 PWA, Main/input CE1000A 127451-4 1 Chas, CE1000A/CE2000A Charcoal 126729-5 2 8 [was Screw, 6-32X.312 Torx Pnhd Sem] [was103433-70605] 3 1 Fan, 120 x 120 x 38mm 24VDC 140CFM 133551-1 4 1 Guard, Fan 102649-1 5 4 8-32 x 1.844 FLT HD PH BLK STL 103281-1 6 1 Asm, CE1000/2000A Input 126773-4 7 4 M2.9 x 9.5mm FLT HD PH TFS BZ AB 103175-1 8 1 IEC Snap IN 15A UL/10A VDE 102650-1 9 1 [was #10 INT Tooth Lockwasher Zinc [ was A10094-8] 10 1 Wire, 14 GRN Flagx5xring A12119-M050N 11 2 8-32 Hex Nut w/Belle A11056-2 12 1 35A 400V Bridge Rectifier C 8752-2 13 4 #10 NYL SHLDR Washer #10-375-A A10099-7 14 4 10-32 x 2.875 PAN HD PH MSCR 125105-1 15 1 [was Cover, CE 1000/CE 2000 Top PC} [was 125178-1] 16 1 XFMR, CE 1000 120V 60HZ 101180-2 17 1 BRKR, 1 Pole 12A Snap-in 102640-1 18 1 [was Overlay, CE 1000 Bottom Front] [was 102651-2] 19 1 Switch, Rocker SPST 22A Chas Mt 126459-1 20 1 [was Overlay, CE 1000/CE 2000 Top Front] [was 125349-1] 21 2 [was Knob, CE 1000/CE 2000 Gain Rubberized] [was 102657-1] 22 X [was Permalock MM-115] [was S 2217-8] Exploded Views 6-28 Rev. D CE Series Service Manual Assy. CE 1000A Domestic (using PWA 102139-8) continued Parts NOT shown in drawing on page 6-2: Item Qty. Description CPN 1 Wire, 14 blk fast fast x 4.0 x flag A11384-C040M 1 Wire, 14 blk fast x 14 x tab A11384-C140N 1 Wire, 14 blk flag x 14 x flag A11384M140M 1 Wire, 14 grn #8ring x 5 x flag A12119-N050M 3 Tie, cable 4" or more 18 lb C 1811-6 X Threadlocker, Titan 7242 50 ML S 2217-8 8 Mscr, 6-32x.25 Torx Pn Hd Sem 103435-70604 1 Pnl, CD output blank 126730-1 1 Clip, D390 Breaker Mounting 125476-2 1 .25OD x .18ID x 1.062 AL SPCR A10100-50 1 8-32x3/8 pnhd T15 Thdrol sem b 126979-1 1 6-32x.31 pnhd acr ph tr isem b 127436-1 1 Serf PWA, CE1000 Main/input 02129-11 Exploded Views 6-29 CE Series Service Manual Rev. D Assy. CE 2000 Domestic (Using PWA 102140-8) Refer to diagram on page 6-14. Item Qty. Description CPN 1 1 Assy, CE 2000 PWA & Chassis 1 PWA, CE2000 Main/input 102140-8 1 Chassis, CE1000/CE2000 125612-3 2 8 [was 6-32 x .312 PNHD TORX TFS SEM BZ] [was 102884-1] 3 1 Fan, 120 x 120 x 38mm 24VDC 140CFM 133551-1 4 1 Guard, Fan 102649-1 5 4 8-32 x 1.844 FLT HD PH BLK STL 103281-1 6 1 Asm, CE1000/CE2000 input 126773-3 7 4 M2.9 x 9.5mm FLT HD PH TFS BZ AB 103175-1 8 1 IEC Snap In 15A UL/10A VDE 102650-1 9 1 [was #10 INT Tooth Lockwasher Zinc] [was A10094-8] 10 1 [was Wire, 14 GRN #10 Ring x 5 x FLAG] [was A12119-K050M] 11 2 8-32 Hex Nut w/Belle A11056-2 12 1 35A 400V Bridge Rectifier C 8752-2 13 4 #10 NYL SHLDR Washer #10-375-A A10099-7 14 4 10-32 x 2.875 PAN HD PH MSCR 125105-1 15 1 [was Cover, CE 1000/CE 2000 Top PC] [was 125178-1] 16 1 BRKT, CE 2000 XFMR TOP AP 102679-3 17 1 XFMR, CE2K 120V 60Hz w/bellybnd 101181-3 18 1 Gasket, CE 2000 XFMR .125 THK SIL Rubber 125488-1 19 1 BRKR, 1 Pole 18A Snap-in 102641-1 20 2 10-32 x .375 PAN HD PH SEM BZ 102720-1 21 1 [was Overlay, CE 2000 Bottom Front] [was 102652-2] 22 1 Switch, Rocker SPST 22A CHAS MT 126459-1 23 1 [was Overlay, CE 1000/CE 2000 Top Front] [was 125349-1] 24 2 [was Knob, CE 1000/CE 2000 Gain Rubberized] [was 102657-1] 25 X Permalock MM-115 S 2217-8 Exploded Views 6-30 Rev. D CE Series Service Manual Assy. CE 2000 Domestic (using PWA 102140-8) continued Parts NOT shown in drawing on page 6-14: Item Qty. Description CPN 1 Wire, 14 blk fast fast x 4.0 x flag A11384-C040M 1 Wire, 14 blk fast x 14 x tab A11384-C140N 1 Wire, 14 blk flag x 14 x flag A11384M140M 1 Wire, 14 grn #8ring x 5 x flag A12119-N050M 3 Tie, cable 4" or more 18 lb C 1811-6 X Threadlocker, Titan 7242 50 ML S 2217-8 8 Mscr, 6-32x.25 Torx Pn Hd Sem 103435-70604 1 Clip, D390 Breaker Mounting 125476-2 1 375 x 205 x 250 nylon spacer A10101-18 1 Wire, 14 grn flagx5xring A12119-M050N 4 Screw, 6-32x.312 torx pnhd sem 103415-70605 4 Sems, 6-32x.31 torx pnhd star 103433-70605 1 Serffan120x120x38mm24VDC118CFM 125400-1 1 Chas, CE2000 PWA & 125433-4 Exploded Views 6-31 CE Series Service Manual Rev. D Assy. CE 2000A Domestic (Using PWA 127452-4) Refer to diagram on page 6-14. Item Qty. Description CPN 1 1 Assy, CE 2000A PWA & Chassis 1 PWA, Main/input CE2000 127452-4 1 Chas, CE1000A/CE20000A charcoal 126729-5 2 8 [was 6-32 x .312 PNHD TORX TFS SEM BZ] [was 102884-1] 3 1 Fan, 120 x 120 x 38mm 24VDC 140CFM 133551-1 4 1 Guard, Fan 102649-1 5 4 8-32 x 1.844 FLT HD PH BLK STL 103281-1 6 1 Asm, CE1000/2000A input 126773-4 7 4 M2.9 x 9.5mm FLT HD PH TFS BZ AB 103175-1 8 1 IEC Snap In 15A UL/10A VDE 102650-1 9 1 [was #10 INT Tooth Lockwasher Zinc] [was A10094-8] 10 1 [was Wire, 14 GRN #10 Ring x 5 x FLAG] [was A12119-K050M] 11 2 8-32 Hex Nut w/Belle A11056-2 12 1 35A 400V Bridge Rectifier C 8752-2 13 4 #10 NYL SHLDR Washer #10-375-A A10099-7 14 4 10-32 x 2.875 PAN HD PH MSCR 125105-1 15 1 [was Cover, CE 1000/CE 2000 Top PC] [was 125178-1] 16 1 BRKT, CE 2000 XFMR TOP AP 102679-3 17 1 XFMR, CE2K 120V 60Hz w/bellybnd 101181-3 18 1 Gasket, CE 2000 XFMR .125 THK SIL Rubber 125488-1 19 1 BRKR, 1 Pole 18A Snap-in 102641-1 20 2 10-32 x .375 PAN HD PH SEM BZ 102720-1 21 1 [was Overlay, CE 2000 Bottom Front] [was 102652-2] 22 1 Switch, Rocker SPST 22A CHAS MT 126459-1 23 1 [was Overlay, CE 1000/CE 2000 Top Front] [was 125349-1] 24 2 [was Knob, CE 1000/CE 2000 Gain Rubberized] [was 102657-1] 25 X Permalock MM-115 S 2217-8 Exploded Views 6-32 Rev. D CE Series Service Manual Assy. CE 2000A Domestic (using PWA 127452-4) continued Parts NOT shown in drawing on page 6-14: Item Qty. Description CPN 1 Wire, 14 blk fast fast x 4.0 x flag A11384-C040M 1 Wire, 14 blk fast x 14 x tab A11384-C140N 1 Wire, 14 blk flag x 14 x flag A11384M140M 1 Wire, 14 grn #8ring x 5 x flag A12119-N050M 3 Tie, cable 4" or more 18 lb C 1811-6 X Threadlocker, Titan 7242 50 ML S 2217-8 8 Mscr, 6-32x.25 Torx Pn Hd Sem 103435-70604 1 Clip, D390 Breaker Mounting 125476-2 1 375 x 205 x 250 nylon spacer A10101-18 1 Wire, 14 grn flagx5xring A12119-M050N 1 .25OD x .18ID x 1.062 AL spcr A10100-50 1 Pnl, CD output blank 126730-1 2 8-32x3/8 pnhd T15 thdrol sem b 126979-1 4 6-32x.31 pnhd acr ph tr isem b 127436-1 1 7.5: cable tie&clamp C 1813-2 1 Serf PWA, CE2000 Main/input 102140-11 Exploded Views 6-33 CE Series Service Manual Rev. D

7 Module and Schematic Information 7.1 General Information Since the introduction of the CE series family of am plifiers there have been several updates and revisions. Many of these changes called for new modules. The following pages list all modules used as of the print ing of this manual, along with suggested service re placements for obsolete modules where applicable. Call the Crown Technical Support Group if you re quire a parts list or schematic for a module not in cluded in this manual. The schematics referenced and provided are repre sentative only. There may be slight variations between amplifier to amplifier. These schematics are intended to be used for troubleshooting purposes only. Note on circuit board designations: Crown circuit boards are referenced with a PWA and/or PWB part number. PWA stands for Printed Wire Assembly. This is the completed circuit board with all components assembled. PWB stands for Printed Wire Board. This is the circuit board only, without components. 7.2 CE-1000, UT-1010, M-120, S2 7.2.1 Main PWAs: 102139-5 Main PWA built on 102138-5 PWB. Used only in early CE-1000. Use 127451-4 as service replacement. 102139-6 Main PWA built on 102138-6 PWB. Replaced 102139- 5. Use 127451-4 as service replacement. 102139-8 Main PWA built on 102138-8 PWB. Replaced 102138- 6. First main module with sensitivity switch. Use 127451- 4 as service replacement. 102139-9 Main PWA built on 102138-9 PWB. Used only in export models. Added 0.775V sensitivity. Use 127451-4 as service replacement. 102139-11 Main PWA built on 102138-9 PWB. Used only in export models. Includes bootstrap update. Use 127451-4 as service replacement. Module and Schematic Information 7-1 127451-4 Special service replacement PWA. Used as replace ment for all PWAs. Comes with other assortment of parts which may need to be replaced in the amplifier depend ing on version of original main PWA. (refer to instruction sheet shipped with PWA). 127353-1 Main PWA built on 102138-9 PWB. Added 0.775V sen sitivity. Use 127451-4 as service replacement. 127353-2 Main PWA built on 102138-9 PWB. Includes bootstrap update. Use 127451-4 as service replacement. 7.2.2 Input PWA: 102689 Original input PWA built on 102688 PWB. Included sen sitivity switch. 126883 Input PWA built on 127004 PWB. Used with main PWAs starting with 102139-8.Sensitivity switch was removed, and moved to the main PWA. Use 127049-1 as service replacement, which is PWA 126883 with new faceplate. 7.2.3 Schematic Diagrams Main PWA For main PWAs 102139-5 or 102139-6 refer to sche matic 102141 F. For main PWA 102139-8 refer to schematic 102141 J. For main PWA 102139-9 refer to schematic 102141 L. For main PWA 127321-1 refer to schematic 102141 M. For main PWAs 127353-1 or 127353-2 refer to sche matic 102141 M. Input Module For input PWA 102689 refer to schematic 102567. For input PWA 126883 refer to schematic 127014. 7.3 CE-1000A 7.3.1 Main/Input PWA: 127451-4 Main/input PWA built on 127450-1 PWB.

Rev. D CE Series Service Manual 126883

7.3.2 Schematic Diagrams Main PWA For main PWA 127451-4 refer to schematic 127451-4. 7.4 CE-2000, UT-2020, M-240, S3 7.4.1 Main PWA: 102140-5 Main PWA built on 102138-5 PWB. Used only in early CE-2000. Use 127452-4 as service replacement. 102140-6 Main PWA built on 102138-6 PWB. Replaced 102139-5. Use 127452-4 as service replacement. 102140-8 Main PWA built on 102138-8 PWB. Replaced 102138- 6. First main PWA with sensitivity switch. Use 127452-4 as service replacement. 102140-9 Main PWA built on 102138-9 PWB. Added 0.775V sen sitivity. Used only in export models. Use 127452-4 as service replacement. 102140-11 Main PWA built on 102138-9 PWB. Used only in export models. Includes bootstrap update. Use 127452-4 as service replacement. 127452-4 Special service replacement PWA. Used as replace ment for all PWA. Comes with other assortment of parts which may need to be replaced in the amplifier depend ing on version of original main PWA. (refer to instruction sheet shipped with PWA). 127354-1 Main PWA built on 102138-9 PWB. Added 0.775V sen sitivity. Use 127452-4 as service replacement. 127354-2 Main PWA built on 102138-9 PWB. Includes bootstrap update. Use 127452-4 as service replacement. 7.4.2 Input Module: 102690 Original input PWA built on 102688 PWB. Included sen sitivity switch. Input PWA built on 127004 PWB. Used with main PWAs starting with 102139-8. Sensitivity switch was removed, and moved to the main PWA. Use 127049-1 as service replacement, which is PWA 126883 with new faceplate. 7.4.3 Schematic Diagrams Main PWA For main PWAs 102140-5 or 102140-6 refer to schematic 102141 F. For main PWA 102140-8 refer to schematic 102142 J. For main PWA 102140-9 refer to schematic 102142 L. For main PWA 127354-1 or 127354-2 refer to sche matic 102142 M. Input PWA For input PWA 102690 refer to schematic 102568. For input PWA 126883 refer to schematic 127014. 7.5 CE-2000A 7.5.1 Main/Input PWA: 127452-4 Main/input PWA built on 127450-1 PWB. 7.5.2 Schematic Diagrams Main/Input PWA For main/input PWA 127452-4 refer to schematic 127452-4. Module and Schematic Information 7-2

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