3.2 Troubleshooting 3.2.1 Feed section
Is the voltage output at IC541 pin 4 is 5V or 0V? NO Is the wiring for IC541 1 ~ 14 correct? YES Is 5V present at IC581 pin 6? YES YES NO Check the vicinity of IC521. Check the feed motor connection wiring. NO Check CD 9V and 5V.
Is 4V present at both sides of the feed motor? YES Check the feed motor.
3.2.2 Focus section
When the lens is moving: NO Check the circuits in the vicinity of IC541 pins 8 and 9. YES
4V
Does the S-search waveform appear at IC561 pins 32? YES
Check the pickup and its connections.
3.2.3 Spindle section
Is the disk rotated? YES Does the RF signal appear at ARF TP? YES Is the RF waveform at ARF TP distorted? YES Proceed to the Tracking section NO NO Check the circuits in the vicinity of IC561 21 ~ 40 or the pickup Check the spindle motor and its wiring. NO Is 4V present between IC541 pins 6 and 7? NO Is 4V present at IC561 pin 29? YES Check the vicinity of IC541. NO Check IC561 and IC901.
3.2.4 Tracking section
When the disc is rotated at first: YES Approx. 1.2V Is the tracking error signal output at TE TP? YES Check IC501. Check the circuit in the vicinity 21 IC561 pins of ~ 40 YES Check the pickup and its connections
