JVC KDSC945/AU
Manual de Servicio

KD-SC945

3.2.1 Feed section

Is the voltage output at IC541 pin "40" 5V or 0V? YES Is 4V present at both sides of the feed motor? YES Check the feed motor.

NO

Is the wiring for IC501 pin 27? NO

YES Is 3.3V present at IC501 pin "20"? YES Check the vicinity of IC541. YES Check the feed motor connection wiring.

NO Check CD 8V and 5V.

NO

Is 6V or 2V present at IC501 "4" and "5"? NO Check IC501.

3.2.2 Focus section

When the lens is moving: 4V
Does the S-search waveform appear at IC501 pins "8" and "9"?

NO

Check the circuits in the vicinity of IC501 pins "8","9"and"15". YES

YES

Check the pickup and its connections

3.2.3 Spindle section

Is the disk rotated? YES Does the RF signal appear at RF test point? YES Is the RF waveform at RF test point distorted? YES Proceed to the Tracking section

NO

Is 4V present at IC501 pins "6" and "7"? YES

NO

Is 4V present at IC541 pins "41" ? YES Check the vicinity of IC501.

NO

Check the spindle motor and its wiring NO NO Check the circuits in the vicinity of IC501 "19"~ "24" or the pickup

Check IC541 and IC501.

3.2.4 Tracking section
When the disc is rotated at first:

YES

Approx. 1.2V Is the tracking error signal output at IC501 "11"?

Check the circuit in the vicinity of IC501 pins "2"~"12".

YES

Check the pickup and its connections

YES Check IC541.

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