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****** Page 1 ****** Service Manual Microwave Oven KOR-6115 KOR-61151 O DAEWOO ELECTRONICS CO., LTD.
****** Page 2 ****** PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY (a) Do not operate or allow the oven to be operated with the door open. (b) Mark the following safety checks on all ovens to be serviced before activating the magnetron or other micro- wave source, and make repairs as necessary: (1) Interlock operation, (2) proper door closing, (3) seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and latches, (5) evidence of dropping or abuse. (c) Before turning on microwave power for any service test or inspection within the microwave generating com- partments, check the magnetron, wave guide or transmission line, and cavity for proper alignment, integrity, and connections. (d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual before the oven is released to the owner. (e)A microwave leakage check to verify compliance with the Federal Performance Standard should be performed on each oven prior to release to the owner. TABLE OF CONTENTS PROPER USE AND SERVICE PRECAUTIONS SPECIFICATIONS FEATURE DIAGRAM INSTALLATION OPERATION MEASUREMENT OF THE MICROWAVE OUTPUT POWER MICROWAVE RADIATION TEST KOR-6115 WIRING DIAGRAM KOR-61151 WIRING DIAGRAM CIRCUIT DESCRIPTION PRECAUTIONS FOR DISASSEMBLY AND REPAIR DISASSEMBLY AND ASSEMBLY INTERLOCK MECHANISM TROUBLE SHOOTING GUIDE COMPONENT TEST PROCEDURE EXPLODED VIEW AND PARTS LIST 2 3 4 5 6 7 8 9 10 11 12 14 15 20 22 24 26
****** Page 3 ****** PROPER USE AND SERVICE PRECAUTIONS CAUTION THIS DEVICE IS TO BE SERVICED ONLY BY PROPERLY QUALIFIED SERVICE PERSONNEL. CONSULT THE SERVICE MANUAL FOR PROPER SERVICE PROCEDURES TO ASSURE I CONTINUED SAFETY OPERATION AND FOR PRECAUTIONS TO BE TAKEN TO AVOID POSSIBLE EXPOSURE -ro EXCESSIVE MICROWAVE ENERGY. 1. 2. For Safe Operation Damage that allows the microwave energy (that cooks or heats the food) to escape will result in poor cooking and may cause serious bodily injury to the operator. IF ANY OF THE FOLLOWING CONDITIONS EXIST, OPERATOR MUST NOT USE THE APPLIANCE. (Only a trained service personnel should make repairs.) 1) A broken door hinge. 2) A broken door viewing screen. 3) A broken front panel, oven cavity. 4) A loosened door lock. 5) A broken door lock. The door gasket plate and even cavity surface should be kept clean. No grease, soil or spatter should be allowed to build up on these surfaces or inside the oven. DO NOT ATTEMPT TO OPERATE THIS APPLIANCE WITH THE DOOR OPEN. The microwave Oven has concealed switches to make sure the power is turned off when the door is opened. Do not attempt to defeat them. DO NOT ATTEMPT TO SERVICE THIS APPLIANCE UNTIL YOU HAVE READ THIS SERVICE MANUAL. For Safe Service Procedures 1) If the oven is operative prior to servicing, a microwave emission check should be performed prior to servicing the oven. 2) If any certified oven unit is found to have excessive emission level 5mW/cm2, the service person should: (a) inform the manufacturer, importer or assembler, (b) repair the unit at no cost to the owner, (c) attempt to ascertain the cause of the excessive leakage, (d) tell the owner not to use the unit until the oven has been brought into compliance. 3) If the oven operates with the door open, the contact the manufacturer immediately. service person CAUTION should tell the user not to operate the oven and MICROWAVE RADIATION PERSONNEL SHOULD NOT BE EXPOSED TO THE MICROWAVE ENERGY WHICH MAY RADIATE FROM THE MAGNETRON OR OTHER MICROWAVE GENERATING DEVICE IF IT IS IMPROPERLY USED OR CONNECTED. ALL INPUT AND OUTPUT MICROWAVE CONNECTIONS. WAVEGUIDES, FLANGES AND GASKETS MUST BE SECURE. NEVER OPERATE THE DEVICE WITHOUT A MICROWAVE ENERGY ABSORBING LOAD ATTACHED. NEVER LOOK INTO AN OPEN WAVEGUIDE OR ANTENNA WHILE THE DEVICE IS ENERGIZED 3
****** Page 4 ****** SPECIFICATIONS ITEM POWER SUPPLY MICROWAVE POWER CONSUMPTION OUTPUT POWER FREQUENCY OUTPUT DIMENSIONS (W X H X D) CAVITY DIMENSIONS (W X H X D) NET WEIGHT TIMER POWER SELECTIONS CAVITY VOLUME * Specifications are subject to change without notice. O SPECIFICATION 120V-60Hz, SINGLE PHASE WITH EARTHING 920 w 600 W (IEC 705) (FULL MICROWAVE POWER) 2450 MHz 465 X 274 X 360 mm (18.3 X 10.8 X 14.2 in.) 290 X 200 X 290 mm (11.4 X 7.9 X 11.4 in) APPROX. 12.5 kg (27.6 lbs.) 35 min. DUAL SPEED 5 LEVELS 0.64 Cu.Ft. 4
****** Page 5 ****** FEATURES DIAGRAM 3 2 4 8 5 1 9 1 11 6 7 Safety Interlock System Door Viewing Screen – Allows viewing of food. The screen is designed so that light can pass through, but not the microwave. AØ Door Hook – When the door is closed, it will automatically shut. If the door is opened while the oven is operating, the magnetron will immediately stop operating. Oven Cavity 0 Door Seal – Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage. Glass Cooking Tray – Made of special heat resistant glass. Food in a proper receptacle is placed on this tray for cooking. Roller Guide – This must always be used for cooking together with the glass cooking tray. Coupler – This fits over the shaft in the center of the oven’s cavity floor. This is to remain in the oven for all cooking. Knob V.P.C – Used to select a microwave power level. Knob Timer – Used in setting cooking time for all functions. Door Release Button – By pushing this button the latch system cut off all circuits and stops the oven before the door is opened. 5
****** Page 6 ****** INSTALLATION 1 Steady, flat location This microwave oven should be set on a steady, flat surface. 2 Leave space behind and side All air vents should be kept a clearance. If all vents are covered during operation, the oven may overheat and, eventually, cause oven failure. Away from radio, and TV sets 3 Poor television reception and radio interference may result if the oven is located close to a TV, Radio or antenna, feeder and so on. A Away from heating appliances and water taps Keep the oven away from hot air, steam or splash when choosing a place to position it, or the insulation might be adversely affected and breakdowns occur. Power supply 5 • Check your local power source. This microwave oven requires a current of approximately 15 amperes, 120 Volts, 60Hz grounded outlet. • Power supply cord is about 1.0 meters long. 1. A short power-supply cord is poovided to reduce the risks resulting from becoming entangled in or tripping over a longer cord. 2. Longer cord sets or extension cords are available and may be used if care is exercised in their use. 3. If a long cord or extension cord is used, (1) the marked electrical rating of the cord set or extension cord should be at least as great as the electrical rating of the appliance, (2) the extension cord must be a grounding-type 3-wire cord, and (3) the longer cord should be arranged so that will not drape over the countertop or tabletop where it can be pulled on by children or tripped over unintentionally. When use 3-pronged plug 3-prong Receptacle Receptacle Box cover o 3-prong plug When use a grounding adaptor, make usre the receptacle box is fully grounded Receptacle Box cover Grounding Lead O 00 Grounding Adaptor Receptacle Examine the oven after unpacking for any damage such as: 6 A misaligned door, Broken door, A dents in cavity. If any of the above are visible, DO NOT INSTALL, and notify dealer immediately. 6
****** Page 7 ****** OPERATION 1 Connect the main lead to an electrical outlet. After placing the food in a suitable container, open the oven door and put it on the glass tray. The glass tray must always be in place during cooking. Close the door securely. 3 Choose cooking power by setting V.P.C. Knob to the desired position. 4 Refer to cookbook for recommended power levels. Determine cooking time. Consult cookbook for recipe timing. 5 ” Oven light turns on and cooling fan starts to operate. Microwave cooking starts. You may open the door while the oven is operating. 6 NOTE : As soon as the door is opened, the safety mecha- 1. When setting Timer for less than 2 nisms stop microwave power and cooking timer. the Timer past 2 minutes and then if you wish to change the time during cooking, simply adjust the Timer to the desired time. When the timer reaches zero, a bell will ring and the 7 unit will turns off. minutes, turn return to the e ” Oven light turns off. If additional cooking time is needed and the door has not been opened, the oven will automatically start when the Timer is reset. Variable Power Cooking correct timer setting. 1 2 35 30 25 20 15 10 4 5 6 2. Various clicking noises may be heard when turning the V.P.C. knob. This is normal and does not affect the operation of your microwave oven. ON and OFF cycle time of mechanicial V.P.C. switch is 30 seconds. When the V.P.C. knob is set to the desired position and timer knob turns to the desired position, has a cycle (ON/OFF time (sec)) listed below. the V.P.C. switch Variable power setting Ill (HIGH) (MED HIGH) (MEDIUM) (DEFROST) (WARM) ONIOFF time (sec) 30/0 23.2/6.8 16.5/13.5 9.8/20.2 5/25 7 Power 100% 77% 55%
****** Page 8 ****** MEASUREMENT OF THE MICROWAVE OUTPUT POWER Microwave output power can be checked by indirectly measuring the temperature rise of a certain amount of water exposed to the microwave as directed below. PROCEDURE 1. Microwave power output measurement is made with the microwave oven supplied at rated voltage and operated at its maximum microwave power setting with a load of 1,000 i 5cc of potable water. 2. The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm. 3. The oven and the empty vessel are at ambient temperature prior to the start of the test. The initial temperature of the water is 10 i 2C (50 i 3.6F). It is measured immediately before the water is added to the vessel. After addition of the water to the vessel, the load is immediately placed on the center of the shelf which is in the lowest normal position. 4. Microwave power is switched on. 5. Heating time should be exactly 49 seconds. Heating time is measured while the microwave genera- tor is operating at full power. The filament heat-up time for magnetrons is not included. 6. The initial and final water temperatures are selected so that the maximum difference between the ambient and final water temperatures is 5K. Water Load Tray 7. The microwave power output P in watts is calculated from the following formula: P = 4187 XAT/t • AT is actual temperature rise. • t is the heating time. The power measured should be 600W i 10.0%. I CAUTION 1. 2 Water load should be measured exactly to 1 liters. Input power voltage should be exactly 230V as specified. 3. Ambient temperature should be 20 i 20C(68 i 3.60F) 8
****** Page 9 ****** MICROWAVE RADIATION TEST WARNING • Make sure to check the microwave leakage before and after repair of adjustment. • Always, start measuring of an unknown field to assure safety for operating personnel from microwave energy. • Do not place your hands into any suspected microwave radiation field unless the safe density level is known. • Care should be taken not to place the eyes in direct line with the source of microwave energy. • Slowly approach the unit under test until the radiometer reads an appreciable microwave leakage from the unit under the test. PROCEDURE A) Prepare Microwave Energy Survey Meter, 600cc glass beaker, glass thermometer 1 OOOC or 212F. B) Pour 275cc i 15cc of tap water initially at 20 i 50C(68 i 90F) in the 600cc beaker with an inside diameter of approx. 9.5cm (3.5 in). C) Place it at the center of the tray and set it in a cavity. D) Close the door and operate the oven. E) Measure the leakage by using microwave energy survery meter with dual ranges, set to 2450 MHz. f i Measured radiation leakage must not exceed the values prescribed below. • Leakage for a fully assembled oven with door normally closed must be less than 4mW/cm2. f i When measuring the leakage, always use the 2 in (5cm) space cone with probe. Hold the probe perpendicular to the cabinet and door. Place the space cone of the probe on the door, cabinet, door seam, door viewing screen, the exhaust air vents and the suction air vents. f i Measuring should be in a counter-clockwise direc- tion at a rate of 1 inch/sec. If the leakage of the cabinet door seam is unknow, move the probe more slowly. O f i When measuring near a corner of the door, keep the probe perpendicular to the areas making sure the probe end at the base of the cone does not get closer than 2 inches from any metal. If it does, erroneous reading may result. 9
****** Page 10 ****** KOR-6115 WIRING DIAGRAM CD L,LJ O 3 O O O O o O 0 UJ o >- o x O o 1.0 o 0 CE L…L…J 10
****** Page 11 ****** KOR-61151 WIRING DIAGRAM LIJ Z 11 0 o 3 O o O O O 0 >- UJ UJ
****** Page 12 ****** CIRCUIT DESCRIPTION 1. When the food is placed in the oven cavity and door is closed. • The contact of the interlock monitor switch open. • The contacts of the primary interlock switch and secondary interlock switch close. 15A Fuse Primary Interlock Switch Interlock Monitor Switch Timer Switch Secondary Interlock Switch @Geard motor CL FM Fan motor FM Fig. 1 2. When the timer is set to the time desired. • The contact of the timer switch close. • Oven lamp turn on. • 120V AC is applied to the high voltage transformer. • Turntable motor start rotating and glass tray rotating. • Fan motor rotating and cools the magnetron by blowing air. • Timer motor operating and point to passing cooking time. • 3.3 Volts AC is generated from the filament winding of the high voltage transformer. This filament voltage is applied to the magnetron to heat the magnetron filament through two noise preventing choke coils. • A high voltage of 2000 Volts AC is generated in the secondary of high voltage transformer and this secondary voltage is increased by the action of the diode and the charging of the high voltage capacitor. This resultant D.C voltage is then applied to the anode of the magnetron. As shown in Fig. 2 the first half cycle of the high voltage produces in the high voltage transformer secondary charges the high voltage capacitor. Current flow is in the direction of the dotted-line during the second half cycle, the voltage produced by the transformer secondary, and the charge of the high voltage capacitor are combined and applied to the magnetron as shown by the solid line so that oscillations begins. The disturbance wave generated by the magnetron is prevented by the choke coils of 1.5pH, filter capacitors of 500pF and the magnetron’s shielded case so that TV and radio programs are not impaired by noise. 12
****** Page 13 ****** 3. HIGH VOLTAGE TRANSFORMER FUSE CAPACITOR I-I.V. DIODE Fig. 2 When the door is opened during cooking. • Primary interlock switch and secondary interlock switch open to cut off the primary voltage to the high voltage transformer to stop microwave oscillation. • Fan motor, timer motor and turntable motor stop rotating. • Oven lamp turn off. • As soon as the door is opened, monitor switch close (NC) to create the short circuit. If the contacts of primary interlock switch and secondary interlock switch are both malfunction, the 15A fuse blows open due to the large current surge caused by monitor switch activation. 13
****** Page 14 ****** PRECAUTIONS FOR DISASSEMBLY AND REPAIR f i Cautions to be observed when trouble shooting. Unlike many other appliances, the microwave oven is a high-voltage, high-current equipment. It is completely safety during normal operation. However, carelessness in servicing the oven can result in an electric shock or possible danger from a short circuit. You are asked to observe the following precautions carefully. (1 ) Always remove the power plug from the outlet before servicing.’ (2) Use an insulated screwdriver and ware rubber golves when servicing the high voltage side. (3) Discharge the high voltage capacitor before touching any oven components or wiring. 1. Check the earthed. Do not operate on a two wire extension cord. The microwave oven is designed to be used with earthed. It is imperative, therefore, to make sure it is earthed properly before beginning repair work. 2. Warning about the electric charge in the high volt- age capacitor. For about 30 seconds after the operation stopped, and electric charge remains in the high voltage capacitor. When replacing or checking parts, short between oven chassis and the negative high terminal of the high voltage capacitor, by using a properly insulated screw driver to discharge. (4) When the 15A fuse is blown out due to the operation of the monitor switch; replace primary, secondary interlock switch and monitor switch. Refer to next page for the necessary adjustment. (5) After repair or replacement of parts, make sure that the screws are properly tightened, and all electrical connections are tightened. (6) Do not operate without cabinet. h CAUTION I WARNING • Service personnel should remove their watches whenever working close to or repairing the magnetron. When servicing the appliance, need a care of touching or replacing high potential parts because of electrical shock or exposing microwave. These parts are as follows-H.V. Transformer, Magnetron, Capacitor, H.V. Diode. 14 H.V.
****** Page 15 ****** DISASSEMBLY AND ASSEMBLY 1. To remove cabinet Remove three screws on cabinet back. 2. To remove door assembly (1) Remove two screws which secure the stopper hinge top. (2) Remove the door assembly ÄØ from top plate of cavity. (3) Remove the above for reassembly. I NOTE After replacing the door perform a check of correct alignment with the I hinge and cavity front face 3. To remove door parts 1 2 3 4 5 6 3 2 7 15
****** Page 16 ****** (1) Remove the gasket door from door plate ACE. (2) Remove the barrier screen inner n 0 from door plate ACE. (3) Remove the door frame ÄLfrom door plate ÄCE. (4) Remove the stopper hinge top nøfrom door plate ÄCE. (5) Remove the spring and the hook n . (6) Remove the barrier screen outer from door frame AL. (7) Remove the above steps for reassembly. 4. Method to reduce the gap between the door seal and the oven front surface. (1) To reduce gap located on part ‘A’. 1) Loosen two screws on stopper hinge top, and then push the door to contact the door seal to oven front surface. 2) Tighten two screws. (2) To reduce gap located on part ‘B’. 1) Loosen three screws on bottom hinge, and then the door to contact the door seal to oven front surface. 2) Tighten three screws. (3) To reduce gap located on part ‘C. (See Fig. A) 1) Loosen a screw on the interlock switch assembly located at the bottom of the oven body. 2) Draw the interlock switch assembly inward as possible to engage with hook on the door bottom. 3) Tighten a screw. (4) To reduce gab located on part ‘D’.(See Fig. B) 1) Loosen a screw on the interlock switch assembly located at the top of the oven body. 2) Follow step (3) 2) and 3). O c Secondary I nterlock Switch Hook o o o o Mounting Screw Hook Mounting Screw Fig. A Primary I nterlock Switch Fig. B I NOTE A small gab may be acceptable if the microwave leakage does not exceed 4mW/cm2. 16
****** Page 17 ****** 5. To remove control panel parts (1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly. Control Panel O 8 1 O 9 6 5 3 (2) Remove the door open lever from the control panel. (3) Remove two screws ÄLwhich secure the timer assembly ÄØ. (4) Remove the timer assembly ÄØ. (5) Pull out the timer knob ÄCfrom the timer assembly ÄØ. (6) Pull out the timer coupler 0 from the timer assembly ÄØ. (7) Remove the screw which secure the V.P.C. coupler n . (8) Pull out the V.P.C coupler and V.P.C knob from the control panel. (9) Remove the door open button rt and button spring from the control panel (10) Reverse the above steps for reassembly. 17
****** Page 18 ****** 6. To remove high voltage capacitor (1) Remove a screw which secure the grounding ring ring terminal of the H.V. diode Aband the capacitor holder ÄØ. (2) Remove the H.V. diode ÄLfrom the capacitor ÄØ. (4) Reverse the above steps for reassembly. High voltage circuit wiring Magnetron H.V. Capacitor 1 3 H.V. Transformer 7. To remove magnetron (1) Remove four screws magnetron AL. (2) Remove the magnetron AL. Diode which secure the (3) Reverse the above steps for reassembly. 18 2
****** Page 19 ****** I CAUTION Never install the magnetron without the metallic gasket plate which is packed with each magnetron to prevent microwave leakage. Whenever repair work is carried out on magnetron, check the microwave leakage. It shall not exceed 4mW/cm2 for a fully assembled oven with door normally closed. Magnetron Antenna Metallic Gasket Plate Cooling Fi Filament Magnetron Terminal 8. To remove fan motor assembly Wave Guid Metallic Gasket Plate Magnetron Antenna (1) Remove two screws which secure the back cover ÄLfrom the cavity outer. (2) Remove two screws nøwhich secure the fan motor ACE from the back cover AL . (3) Pull out the fan A 0 from the fan motor ACE. (4) Reverse the above steps for reassembly. 5 9. To remove transformer O 00 0000000000 0 0000 0 0 o oo o o 00 0 00 00 ooo o o o o o O ooo 00 3 2 4 (1) Remove the two screws holding the H.V. trans- former AL . (2) Remove the transformer AL. (3) Reverse the above steps for reassembly. 00 00000 pv o o 0000 0 o 19
****** Page 20 ****** INTERLOCK MECHANISM The door lock mechanism is a device which has been specially designed to completely eliminate microwave radiation when the door is opened during operation, and thus to perfectly prevent the danger resulting from the leakage of microwave. (1) Primary interlock switch When the door is closed, the hook locks the oven door. If the door is not closed properly, the oven will not operate. When the door is closed, the hook pushes the button of the micro switch. Then the button of the primary interlock switch bring it under on condition. Hook Adjustment 1 O When the door is closed, the switch button is pushed by the hook. The movement of the switch button should exceed 1.2mm measured at the top of the button. Latch Mounting Screw Button O Primary Interlock Switch O O 20
****** Page 21 ****** (2) Secondary interlock switch and interlock monitor switch When the door is closed, the hook pushes the push lever downward, the push lever presses the button of the interlock monitor switch to bring it under “OFF”, condition and presses the button of the secondary interlock switch to bring it under “ON”, condition. Interlock Monitor Swtich Hook Adjustment 2 • Interlock monitor switch o o O O o Secondary Interlock Switch Push Lever When the door is closed, the interlock monitor switch should be opened before other switches close. When the door is opened, the interlock monitor switch should be closed after other switches open. • Secondary interlock switch The movement of the switch button should exceed 1.2mm measured at the top of the button. (3) Adjustment steps a) Loosen the two mounting screws. b) Adjust interlock switch assembly position. c) Confirm the gap (1.2mm) described above. d) Make sure that push lever moves smoothly after adjustments is completed. e) Completely tighten the two mounting screws. I NOTE Microwave emission test should be performed after adjusting interlock machanism. emission exceed 4mW/cm2, readjust interlock mechanism. If the microwave 1 (4) Interlock switch replacement Whenever safety interlock switch are replaced: 1) Refer to the following diagram. 2) Check the connection of monitor switch after replacement. 3) Perform the electrical continuity check of interlock switches and microwave emission test mentioned in this manual. Secondary Interlock Switch WH Interlock Monitor Switch Primary Interlock Switch RD 21 SYMBOL RD WH COLOR RED WHITE BLACK BLUE
****** Page 22 ****** TROUBLE SHOOTING GUIDE TROUBLE DOOR SHUT, TIMER SET BUT NO COOKING TAKES PLACE. 1. Does the fan motor work when you shut the door and turn the timer? NO Does 15A fuse blow? NO continuity Replace fuse. Both continui YES Check continuity of inter- lock monitor switch with door shuted. Check continuity of both interlock switch’s contact and monitor switch’s contact with door partial- ly open until monitor switch con- tact closes. One is continuity the other is not Disconnect one side of the lead wire connected from transformer to the high voltage capacitor, and operate oven. Fuse again blows Outlet has Proper voltage. Check continuity of power supply cord. 22 Normal continuity Both no continuity NO continuity Replace primary interlock switch, secondary interlock switch and interlock monitor switch. *All these switches must be replace at the same time. Replace primary, secondary interlock switch and interlock monitor switch. Replace primary, secondary interlock switch and interlock monitor switch. Replace high voltage capacitor. Replace high voltage transformer. Replace Power supply cord.
****** Page 23 ****** 2. Does the fan motor when you shut the door and turn the time? YES Does the oven lamp light? Does the turntable turn? YES No microwave oscillation. Check continuity of filament of magnetron. Poor continuity NO NO continuity Check continuity of filament of magnetron. *Do not operate when you check this continuity NO continuity Check continuity fil- ament tap (3.3V) of high voltage transformer. NO continuity *Normal reading should be approx. 0 Q Check the diode for cintinuity in the reverse and normal direction Continuity in the reverse direction *Meter with 6V or higher voltage batteries should be used to check the normal direction resistance of the diode. NO GOOD Check the isolation of filament winding of high voltage transformer. GOOD Faulty magnetron 23 Replace or repair oven lamp, turntable motor. Replace magnetron. Replace high voltage transformer. Replace high voltage diode. Replace high voltage transformer. Replace magnetron.
****** Page 24 ****** COMPONENT TEST PROCEDURE 1. High voltage is present at the high voltage terminal of the voltage transformer during any cooking cycle. 2. It is neither necessary nor advisable to attempt measurement of the high voltage. 3. Before touching any oven components or wiring, always unplug the oven from its power source and discharge the capacitor (see page 13). 1. High voltage transformer (A) Remove connections from the transformer terminals and check continuity. (B) Normal readings should be as follows: Secondary winding Filament winding Primary winding 2. High voltage capacitor Approx. 1500 i Approx. OQ Approx. OQ (A) Check continuity of capacitor with meter on the highest OHM scale. (B) A normal capacitor will show continuity for a short time, and then indicate 9MQ once the capacitor is charged. (C) A shorted capacitor will show continuous continuity. (D) An open capacitor will show constant 9MQ. (E) Resistance between each terminal and chassis should be infinite. 3. High voltage diode (A) Isolate the diode from the circuit by disconnecting the leads. (B) With the ohmmeter set on the highest resistance scale, measure the resistance across the diode terminals. Reverse the meter leads and again observe the resistance reading. Meter with 6V, 9V or higher voltage batteries should be used to check the front- back resistance of the diode, otherwise an infinite resistance may be read in both directions. A normal didoes resistance will be infinite in one direction and several hundred KQ in the other direction. 4. Magnetron For complete magnetron diagnosis, refer to “Measure- ment of the Microwave Output Power”. (Page 8) Continuity checks can only indicate and open filament or a shorted magnetron. To diagnose for an open filament or shorted magnetron, (A) Isolate magnetron from the circuit by disconnecting the leads. (B) A continuity check across magnetron filament termi- nals should indicate 0. Iohm or less. (C) A continuity check between each filament terminal and magnetron case should read open. 5. Fuse If the fuse in the primary and monitor switch circuit is blown when the door is opened, check the primary and monitor switch before replacing the blown fuse. In case the fuse is blown by an improper switch operation, replace the defective switch and fuse at the same time. Replace just the fuse if the switches operate normally. CAUTION REPLACE BLOWN FUSE WITH 15 AMPERE FUSE. 24
****** Page 25 ****** 6. Interlock switches • You can test continuity of safety interlocks and monitor switch by using switch tester or ohmmeter. • The switch operation is checked by zero/unlimited. the meter should indicate zero resistance. • The sequence of check is interlock monitor switch; primary and secondary interlock switched check. 1) In case of interlock monitor switch check POWER SUPPLY CORD PRIMARY INTERLOCK SWITCH OHHMETER 2) In case of primary interlock switch check. POWER SUPPLY CORD PRIMARY INTERLOCK SWITCH Condition 1) Door is opened. 2) Common terminal of the monitor switch disconnected. INTERLOCK MONITOR SWITCH Condition 1) Door is closed. INTERLOCK MONITOR SWITCH OHH METER 25
****** Page 26 ****** EXPLODED VIEW AND PARTS LIST 1. Door Assembly A05 A06 AOI A02 A03 A04 PARTS CODE 3517003000 3512202500 3515201000 3511705500 3517002800 3512300200 3513100700 3515101300 26 A07 A08 NO AOI A02 A03 A04 A05 A06 A07 A08 PART NAME BARRIER-SCREEN *0 FRAME DOOR STOPPER HINGE *T DOOR WELD AS BARRIER-SCREEN *l GASKET DOOR HOOK SPRING HOOK Q’TY 1 1 1 1 1 1 1 1
****** Page 27 ****** 2. Control Panel Ass’y BOI O BII B02 BIO B03 809 B04 B05 PARTS CODE 3513402600 3512202000 3517400500 7621401211 3513402500 3517400400 3518203800 7621401211 3513701400 441 B655072 3516903600 B06 BOB NO BOI B02 B03 B04 B05 B06 B07 B08 B09 BIO BII PART NAME KNOB VPC CONTROL PANEL COUPLER VPC KNOB SCREW TAPPINGT2S PAN 4X12 PW KNOB COUPLER TIMER TIMER SCREW TAPPING T2S PAN 4X12 PW LEVER DOOR OPEN SPRING DOOR BUTTON BUTTON DOOR OPEN Q’TY 1 1 1 1 1 1 1 2 1 1 1
****** Page 28 ****** KOR-6115 Parts List REE NO. AOO BOO FOI F02 F03 F04 F05 F06 F07 F08 F09 FIO F12 F13 F14 F15 F16 F17 F18 F19 F20 F21 F22 F23 F24 F25 F26 F27 F28 F29 F30 F31 F32 F33 F34 F35 F36 F37 F38 F39 F40 PART CODE 3511706010 3516713100 3510801300 7S312X40A1 3516104800 7S341W40B1 7S341W40B1 4413A90012 7S422X4081 35113NBND5 3518002200 7S312X40A1 7S312X40A1 7S101W4081 3511402500 3963820110 3511800300 7S422X4081 3513001900 441L267010 4416 3518106600 7S427W40A1 3512100900 3510308700 7S422X4081 7S312X40A1 3515201100 5S762SIOGO 5S762MIOGO 5S762SIOGO 3513701300 3513805700 3513601500 7121400811 3966820200 3511403200 3517400600 3514700900 3512509200 3512510600 3517203600 7S427W40A1 PART NAME DOOR AS CONTROL-PANEL AS CABINET SCREW SPECIAL CAVITY AS SCREW SPECIAL SCREW SPECIAL CLAMP POWER CORD SEREW SPECIAL CORD POWER AS MAGNETRON SCREW SPECIAL SCREW SPECIAL SCREW MACHINE COVER *B MOTOR SHADED POLE FAN SCREW SPECIAL HOLDER HV CAPACITOR CAPACITOR HV DIODE HV TRANS HV SCREW SPECIAL FOOT BASE SCREW SPECIAL SCREW SPECIAL STOPPER HINGE SW MICRO SW MICRO SW MICRO LEVER LOCK LOCK LAMP SCREW TAPPING MOTOR SYNCRO COVER WAVE GUIDE COUPLER ROLLER GUIDE ROLLER GUIDE ROLLER AS TRAY SCREW SPECIAL DESCRIPTION KOR-61150S KOR-61150A PCM TO.6 Tl TRS 4X10 SE MFZN KOR-61150S T2S PAN 4X12 PW SE MFZN T2S PAN 4X12 PW SE MFZN NYLON 66 TT2 TRS 4X8 SE MFZN 3X1.45 60X60 200-RTML 2M218H MF I Tl TRS 4X10 SE MFZN Tl TRS 4X10 SE MFZN PAN FLANGE 4X8 MFZN SBHG TO.8 120V 17W MWIOXA-ROI pp+300/o GLASS TT2 TRS 4X8 SE MFZN SECC TO.8 21 OOVAC 0.7UF SANKEN HVR-1X-32B (D5.3) JMOT-N60AO-61T TT2 HEX FG 4X10 SE MFZN PP DASF-130 SBHG TO.8 TT2 TRS 4X8 SE MFZN Tl TRS 4X10 SE MEZN SCP-I T2.5 VI 6-FA-63 SPNO #187 200G VI 6-FA-62 SPNC #187 200G VI 6-FA-63 SPNO #187 200G POM POM BLACK BL 125V 25WT25 C5A 1-1187 T2S PAN MFZN 120V 2W GM-16-12F17 HEATPROOF PP TEFLON pp KOR-61150S GLASS TT2 HEX FG 4X10 SE MFZN 29 QTY 1 1 1 3 1 2 1 1 1 1 1 3 2 2 1 1 1 1 1 1 1 1 4 2 1 2 6 1 1 1 1 1 1 1 2 1 1 1 3 1 1 1 2 REMARKS
****** Page 29 ****** KOR-61151 Parts List REE NO. AOO BOO FOI F02 F03 F04 F05 F06 F07 F08 F09 FIO F 11 F 12 F13 F 14 F15 F16 F 17 F18 F 19 F20 F21 F22 F23 F24 F25 F26 F27 F28 F29 F30 F31 F32 F33 F34 F35 F36 F37 F38 F39 F40 F41 F F42 F43 PART CODE 3511706010 3516713100 3510801300 7S312X40A1 3516104820 7S341W40B1 7S341W40B1 4413A90012 7S422X4081 35113YAR95 3518902400 7121300811 3518002200 7S312X40A1 7S312X40A1 7S101W4081 3511402510 3963820110 3511800300 7S422X4081 3513001900 441 L267010 4416 3518106600 7S427W40A1 3512100900 3510308700 7S422X4081 7S312X40A1 3515201100 5S762S1 OGO 5S762MIOGO 5S762S1 OGO 3513701300 3513805700 3513601500 3518603700 7121400811 3966820200 3511403200 3517400600 3514700900 3512509200 3512510600 3517203600 7S427W40A1 PART NAME DOOR AS CONTROL-PANEL AS CABINET SCREW SPECIAL CAVITY AS SCREW SPECIAL SCREW SPECIAL CLAMP POWER CORD SEREW SPECIAL CORD POWER AS THERMOSTAT SCREW TAPPING MAGNETRON SCREW SPECIAL SCREW SPECIAL SCREW MACHINE COVER *B MOTOR SHADED POLE FAN SCREW SPECIAL HOLDER HV CAPACITOR CAPACITOR HV DIODE HV TRANS HV SCREW SPECIAL FOOT BASE SCREW SPECIAL SCREW SPECIAL STOPPER HINGE *U SW MICRO SW MICRO SM MICRO LEVER LOCK LOCK LAMP NOISE-FILTER SCREW TAPPING MOTOR SYNCRO COVER WAVE GUIDE COUPLER ROLLER GUIDE ROLLER GUIDE ROLLER AS TRAY SCREW SPECIAL 31 DESCRIPTION KOR-61150S KOR-61150A PCM TO.6 Tl TRS 4X10 SE MFZN KOR-61151A CSA T2S PAN 4X12 PW SE MFZN T2S PAN 4X12 PW SE MFZN NYLON 66 TT2 TRS 4X8 SE MFZN 3X1.45 60X60 120-RTML OFF:80 ON:50 V PW-2N #187 T2S PAN 3X8 MFZN 2M218H(MF) I Tl TRS 4X10 SE MFZN Tl TRS 4X10 SE MFZN PAN FLANGE MFZN SBHG TO.8 120V 17W MWIOXA-ROI pp+300/o GLASS TT2 TRS 4X8 SE MFZN SECC TO.8 21 OOVAC O.7UF SANKEN HVR-1X-32B (D5.3) JMOT-N60AO-61T TT2 HEX FG 4X10 SE MFZN PP DASF-130 SBHG -ro.8 TT2 TRS 4X8 SE MFZN Tl TRS 4X10 SE MEZN SCP-I T2.5 V16-FA-63 SPNO #187 200G V16-FA-62 SPNC #187 200G V16-FA-63 SPNO #187 200G POM POM BLACK BL 125V 25W T25 C5A 1-1187 DWLF-M T2S PAN 4X8 MFZN 120V 2W GM-16-12F17 HEATPROOF PP pps TEFLON pp KOR-61150S GLASS TT2 HEX FG 4X10 SE MFZN Q’TY 1 1 1 3 1 2 1 1 1 1 1 1 1 3 2 2 1 1 1 1 1 1 1 1 4 2 1 2 6 1 1 1 1 1 1 1 1 2 1 1 1 3 1 1 1 2 REMARKS
****** Page 30 ****** DAEWOO ELECTRONICS CO., LTD 686, AHYEON-DONG, MAPO-GU, SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC 1<28177-8 CABLE: "DAEWOOELEC" FAX: 02) 364-5588/5305 TEL: 02) 360-7114/7315-7 PRINTED DATE: MAR., 1996
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