SHARP IMDR580HBK
Service Manual

IM-DR580H
� Abnormal display
Is a waveform found in pins 2 to 4 of CR101 and pins 2 to 4 of CR102 and pins 2 to 4 of CR103 and pins 2 to 4 of CR104 ? Is pin 1 (VCC) of CR101 and pin 22 (VCC) of CR104 and pin 20 (GND) of CR101 and pin 1 (GND) of CR104 normal ? Check between IC401 and CR101. Yes Check around IC401. Is a waveform found in pins 33, 35 and 37 of IC401 ? No Yes No

Check the pattern and soldering of multi-link station PWB and LCD flexible PWB. If no problem is found, replace the LCD.

� Audio playback circuit
If playback time is counted but no sound is heard during continuous playback. Is an audio waveform found in pins 1 (TP721), 2 (TP722), 3 (TP723) and 4 (TP724) of J703 ? No Is there a pulse where duty varies in pins 2 and 5 of Q751, Q752, Q761 and Q762 ? No Is a pulse waveform found in pins 1, 4, 9 and 12 of IC751 and pins 1, 4, 9 and 12 of IC761 ? Are pins 2, 5, 10 and 13 of IC751 H ? Yes OK Does pulse waveform appear on pins 5, 6, 8 and 9 of IC203? No Check pins 68, 69, 71 and 72 of IC201 and pin 19 of IC401. If the voltage of pin 6 of Q751 and Q752 and pin 3 of Q761 and Q762 is below 2 V when setting VOLUME to MAX, check the power supply circuit of IC813 and IC821. Check soldering of J703, the remote control and the earphones. Yes

Yes

No

� The spindle motor does not rotate.

Does a waveform appear in pins 26 and 27 of IC201 after ending the test mode AUTO2 ? Yes

No

Check the periphery of IC201.

Is a waveform found in pins 60 to 64 of IC601 ? Yes If there is no defect in soldering of CN601 and insertion of the flexible PWB, replace the spindle motor.

No

Check the periphery of IC601.

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