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A great copy of the manual, and the only one I could find anywhere on the net! The circuit diagrams are easily readable, all component values marked and easy to see. A highly appreciated download!
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Great Manual. This manual is available no where else. It was exactly what I was looking for.
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The TEAC A-1500's Service Manual was instrumental in reviving this classic reel-to-reel. Not only does it have the schematics, exploded parts diagram and parts list, it also provided mechanical adjustment information that approximate factory default settings.
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This service manual was determinant to enable to fix my Alpine Amplifier. I am pleased with my purchase. For a 5 star rating I would like to see a higher resolution scan of the printed circuit board lay-out because the gray scale grafics was dificult to see. Also some schematic diagrams were scanned at a slight angle. Never the less, it had all information I needed to troubleshoot and service my equipment.
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Complete manual, the good quality of reproduction allows enlarged print-out of the schematic diagram in the size it probably had in the original print edition and which is necessary for practical use.
LC-26GA5E LC-37GA5E LC-32GA5E
Troubleshooting Table (continued)
No picture in the LCD section
Is the power supplied to the LCD CONTROLLER PWB? (P7707: +6/+4/+13V) Check if the REG output -D3.3V_1/2 of IC7706/IC7704 (REG-IC) is sent properly.
YES
Is the output signal of IC4601 (GAMMA) sent properly?
NO
YES
Adjustment process menu: Is the gradation pattern displayed properly when setting "PATTERN1" in the second llayer of "LCD CONT" to "02"?
Check the FFC (LV, SC2201 - SC4601) between MAIN PWB and LCD CONTROLLER PWB and input circuit of IC4601. Check IC4501 (LCD CONTROL) and its peripheral circuits.
NO
YES
Check IC4901 (QS-DRIVER) and its peripheral circuits.
Data bit drop (gradation-related)
Adjustment process menu: Is the gradation pattern displayed properly when setting "PATTERN1" in the second layer of "LCD CONT" to "02"?
NO
Check the connection between SC4651 and SC4652 and peripheral circuits of IC4501 (LCD CONTROL).
YES
Adjustment process menu: Is the gradation pattern displayed properly when setting "PATTERN2" in the second layer of "LCD CONT" to "1"?
NO
Check IC4902 (FIFO) and its peripheral circuits.
YES
Check IC4601 (GAMMA) and its peripheral circuits.
Noise is caused to the moving picture with the QS drive on.
Is the input voltage at pin (62) (OS-TEMP) of IC2004 (microprocessor) 5V?
NO
Check IC4901 (QS-DRIVER) and its peripheral circuits.
YES
Is the harness connected correctly between the inverter GND PWB and LCD CONTROLLER PWB?
NO
Connect the harness correctly or replace it.
YES
The thermistor on the INVERTER GND PWB is faulty. Or check the peripheral circuits.
The whole screen is whitish (LCD power supply).
YES
Adjustment process menu: Is the gradation pattern displayed properly when setting "PATTERN2" in the second layer of "LCD CONT" to "1"? (Is it whitish or dark?) Check the video signal circuits (IC4501, IC4901, IC4601).
NO
Disconnect the FPC from SC4651 and SC4652. (To protect the panel against damage)
YES
Check the power supply voltage supplied to the panel (check at SC4651 and SC4652).
46
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