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What are the specifications of the TECHNICS SA-EX900?
General
| Power consumption | 265W, 335VA (In standby condition: 2W) |
| Power supply | AC 120V, 60Hz |
| Dimensions (W x H x D) | 430 x 158 x 358 mm (16 15/16″ x 6 7/32″ x 14 3/32″) |
| Weight | 10.3 kg (22.7 lb.) |
FM Tuner Section
| Frequency range | 87.9 — 107.9MHz |
| Sensitivity | 11.2dBf (2µV, IHF ’58) |
| 50dB quieting Sensitivity | |
| MONO | 18.3dBf (4.5µV, IHF ’58) |
| STEREO | 38.3dBf (45µV, IHF ’58) |
| Total harmonic distortion | |
| MONO | 0.2% |
| STEREO | 0.3% |
| S/N | |
| MONO | 75dB |
| STEREO | 70dB |
| Frequency response | 20Hz — 15 kHz (+1dB, -2dB) |
| Alternate channel selectivity | 65dB |
| Capture ratio | 1dB |
| Image rejection at 98MHz | 44dB |
| IF rejection at 98MHz | 80dB |
| Spurious response rejection at 98MHz | 75dB |
| AM suppression | 50dB |
| Stereo separation | |
| 1 kHz | 40dB |
| 10kHz | 30dB |
| Carrier leak | |
| 19kHz | -35dB |
| 38kHz | -50dB |
| Antenna terminal(s) | 75Ω (unbalanced) |
AM Tuner Section
| Frequency range | 530 — 1710kHz |
| Sensitivity | 20µV, 330µV/m |
| Selectivity | 55dB |
| Image rejection at 1000kHz | 40 dB |
| IF rejection at 1000kHz | 60dB |
Video Section
| Output voltage at 1 V input (unbalanced) | 1±0.1 Vp-p |
| Maximum input voltage | 1.5 Vp-p |
| Input/output impedance | 75 Ω |
Amplifier Section
| Rated minimum sine wave RMS power output 20 Hz-20 kHz both channels driven 0.05% total harmonic distortion | 120W per channel (8Ω) |
| 1 kHz continuous power output, both channels driven 0.05% total harmonic distortion | 125W per channel (8Ω) |
| Total harmonic distortion | |
| Rated power at 20 Hz – 20kHz | 0.05% (8Ω) |
| Half power at 1 kHz | 0.03% (8Ω) |
| Power output at the Dolby Pro Logic operation 0.9% at 1 kHz, | |
| Front | 2Χ100 W (8Ω) |
| Center | 100 W (8Ω) |
| Surround | 100 W (8Ω) |
| Sub-Woofer | 100 W (8Ω) |
| Low frequency damping factor | 30 (8Ω) |
| Load impedance | |
| A or B | 4-8Ω |
| A and B | 8Ω |
| Center | 8Ω |
| Surround | 4-8Ω |
| Sub-Woofer | 8Ω |
| Dynamic headroom | 2dB (8Ω) |
| SMPTE intermodulation distortion | 0.3% (8Ω) |
| Frequency response | |
| PHONO | RIAA standard curve ± 0.8dB |
| CD, TAPE, VCR 1, TV, VCR 2, VDP | 7Hz — 70kHz, ± 3dB |
| Input sensitivity | |
| PHONO | 0.4mV (3mV, IHF ’66) |
| CD, TAPE, VCR 1, TV, VCR 2, VDP | 27mV (200mV, IHF ’66) |
| S/N (IHF A) | |
| PHONO | 70dB (80dB, IHF ’66) |
| CD, TAPE, VCR 1, TV, VCR 2, VDP | 75dB (85dB, IHF ’66) |
| Input impedance | |
| PHONO | 47kΩ |
| CD, TAPE, VCR 1, TV, VCR 2, VDP | 22kΩ |
| Tone controls | |
| BASS | 50Hz, +10 to -10dB |
| TREBLE | 20kHz, +10 to -10dB |
| Loudness control (volume at -30dB) | 50Hz, +9dB |
| Sub-Woofer frequency response | 7-100Hz |
What should I know about the protection circuitry on the TECHNICS SA-EX900?
The protection circuitry on the TECHNICS SA-EX900 may have operated if you notice either of the following conditions:
• No sound is heard when the power is turned on.
• Sound stops during a performance.
The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker connection wires are “shorted,” or if speaker systems with an impedance less than the indicated rated impedance of the amplifier are used.
If this occurs, follow the procedure outlined below:
1. Turn off the power.
2. Determine the cause of the problem and correct it.
3. Turn on the power once again after one minute.
Note: When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again.
How do I troubleshoot the fan motor on the TECHNICS SA-EX900?
If the cooling fan is not operating and “OVER LOAD” is displayed on the FL display, check the fan motor and its driving circuit.
1. Check if the air cooling path is blocked or if the fan motor is jammed by any external obstacle. If so, remove the obstacle.
2. If there is no obstruction, remove the fan from the unit and check the fan motor’s DC resistance. It should be 20 ~ 30 Ω.
• Short circuit: DC resistance below 5Ω.
• Open circuit: DC resistance over 1kΩ.
3. If the resistance is correct, reinstall the fan on the unit.
4. Check if the terminal voltage of Q772 and Q773 is normal in both active and inactive states of the fan motor. See the table below.
| Terminal | fan off | fan on | |
|---|---|---|---|
| Q771 | E | 0V | 0V |
| C | -0.7V | 0V | |
| B | 0V | -0.7V | |
| Q772 | E | 0V | 0V |
| C | 0V | -9.1V | |
| B | -0.7V | 0V | |
| Q773 | E | 0V | -8.0V |
| C | -14.8V | -14.8V | |
| B | 0V | -8.5V | |
5. If the voltages are not normal, check the integrity of Q771, Q772, Q773 and the fan motor driving circuit.
6. If the voltages are normal, check if an audio signal is present at pins ③ and ④ of IC601, pins ③ and ④ of IC602, or pins ⑦ of IC603.
• If there is no audio signal, the power IC (IC601, IC602 or IC603) is defective.
• If there is an audio signal, the fan motor, power ICs and fan driver are functioning normally.
What does it mean when “OVERLOAD” is displayed on my TECHNICS SA-EX900?
The HIC protection circuit functions if any cord at a speaker terminal is short-circuited or if the unit overheats because of improper operation. At the same time, “OVERLOAD” scrolls across the FL display.
In this state, all keys remain inoperative; if any key is pressed, “SWITCH OFF POWER” scrolls across the FL display.
If an overload occurs, immediately power off the unit and check the speaker connection, venting holes and cooling fans. After fixing any faults, power on the unit again and check for proper operation.
If no defects are found, or if the unit remains in overload after it is powered on again, check the circuit for faults.
How do I perform a check of the Surround Circuit on the TECHNICS SA-EX900?
This unit incorporates a service mode, allowing the surround circuit to be tested using in-phase signals.
When the CD player or AF oscillator is connected:
1. Power on the unit.
2. Set the input selector button of the unit to the “CD” position.
3. Press the “Pro Logic” button.
4. The letter “SURROUND” will flash on the FL display.
5. Run the CD player or Run the AF oscillator.
When the tape deck is connected:
1. Power on the unit.
2. Set the input selector button of the unit to the “TAPE MONITOR” position.
3. Press the “Pro Logic” button.
4. The letter “SURROUND” will flash on the FL display.
5. Run the tape deck.
Using the Oscilloscope, check the output waveforms at the test points on the circuit boards in the following order: (C1,S1) = (C2,S2) = (C3,S3) = (C4,S4) = (C5,S5).
To exit the service mode, power off the unit.
What are the steps for replacing the fan motor on the TECHNICS SA-EX900?
Step 1. Release the 3 claws on the rear panel to remove the fan unit.
Step 2. Put a screwdriver at the root of the fan and remove it.
Step 3. Remove the fan cap by releasing the claw.
Step 4. Desolder the wires from the motor terminal and replace it with a new one.
NOTE: When replacing the fan motor, align the boss of the fan case with the hole of the fan motor.
What are the terminal functions for the IC901 System Microprocessor in the TECHNICS SA-EX900?
| Pin No. | Mark | I/O | Function | Pin No. | Mark | I/O | Function |
|---|---|---|---|---|---|---|---|
| 1~7 | D4~D10 | O | Digit signal of FL display | 36~40 | SFC1~SFC5 | – | Not used |
| 8 | VDD | I | Power supply terminal | 41 | TNR_CE | O | Chip enable signal |
| 9 | SUR/OSD_CK | O | Serial clock signal | 42 | SEL/TNR_DT | O | Serial data signal |
| 10 | SUR/OSD_DT | O | Serial data signal | 43 | SEL/TNR_CK | O | Serial clock signal |
| 11 | VIDEO_DET | – | Not used | 44 | TV/VCR2 | – | Not used |
| 12 | SUR_CE | O | Chip enable signal | 45 | ADAPTOR | – | Not used |
| 13 | VOL_UP | O | Rotate control terminal of volume motor | 46 | HOLD | I | Hold signal input terminal |
| 14 | VOL_DWN | O | 47 | REMOTE | I | Remote control terminal | |
| 15 | LOUDNESS | – | Not used | 48 | GND | – | GND terminal |
| 16 | FM_STEREO | I | Stereo signal detect terminal | 49 | SEL_ST | O | Level shift control terminal |
| 17 | RESET | I | Reset detect terminal | 50 | HELP_LED | O | LED drive signal (HELP) |
| 18 | SD | I | Received signal detect terminal | 51 | STANDBY_LED | – | Not used |
| 19 | OSD_ST | – | Not used | 52 | VDD | I | Power supply terminal |
| 20 | GND | – | GND terminal | 53 | REC_MUTE | – | Not used |
| 21 | VIDEO_B | O | Video selector control terminal | 54 | S/C_SP | O | Surround and speaker select control terminal |
| 22 | VIDEO_A | O | 55 | SP B | – | Not used | |
| 23 | IF_DATA | I | Serial data signal | 56 | SP_A | O | Speaker select control terminal |
| 24 | THERMAL | O | Mute control terminal | 57 | POWER_RLY | O | Relay control terminal |
| 25~28 | KEY1~KEY4 | I | Key matrix detect terminal | 58 | AF_MUTE | O | Muting control terminal |
| 29 | AVDD | I | Power supply terminal | 59 | LIMITTER | – | Not used |
| 30 | AVREF | I | Power supply terminal | 60 | INIT_IN | – | Not used, connect to resistor |
| 31 | OVERLOAD | I | Overload detect terminal | 61~70 | S16~S7 | O | Segment signal of FL display |
| 32 | XT2 | – | Not used | 71 | VLOAD | I | Power supply terminal |
| 33 | GND | – | GND terminal | 72~77 | S6~S1 | O | Segment signal of FL display |
| 34 | XIN | I | Crystal oscillator terminal | 78~80 | D1~D3 | O | Digit signal of FL display |
| 35 | XOUT | O | (4MHz) |
What do the various switches and controls on the TECHNICS SA-EX900 do?
| S301 | TV/VCR2 switch | S970 | Simulated switch |
| S946 | Power switch | S971 | Theater switch |
| S947 | Phono select switch | S972 | Live switch |
| S948 | Muting switch | S973 | Club switch |
| S950 | FM Auto/Mono switch | S974 | Hall switch |
| S951 | Band select switch | S975 | VDP switch |
| S952 | Tuning decrease switch | S976 | Delay time switch |
| S953 | Tuning increase switch | S980 | Speakers A switch |
| S954 | Memory manual/auto switch | S981 | Speakers B switch |
| S956 | Preset decrease switch | S982 | Loudness switch |
| S957 | Preset increase switch | S983 | Dolby Pro Logic/SFC off on switch |
| S958 | Help switch | S984 | Dolby Pro Logic mode select switch |
| S960 | Tuner select switch | S985 | Center mode select switch |
| S961 | CD select switch | VR501-1~VR501-4 | Volume control |
| S962 | Tape select switch | VR502 | Balance control |
| S963 | TV/VCR2 select switch | VR511-1~VR511-2 | Bass control |
| S964 | VCR1 select switch | VR512-1~VR512-2 | Treble control |
| VR1150 | Sub-Woofer control |
What is the fuse replacement caution for the TECHNICS SA-EX900?
Symbols located near the fuse indicate that the fuse used is a fast operating type. For continued protection against fire hazard, replace only with the same type fuse. For fuse rating, refer to the marking adjacent to the symbol.
For the TECHNICS SA-EX900, the specified fuse is: F1, F3 & F4 8A 125V FUSE.
RISK OF FIRE – REPLACE FUSE AS MARKED.
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