OK?..manual is complet and helpfull... for repairing such a old and rare boombox like JVC PCM it is necessary...
Text excerpt from page 25 (click to view)
KD-SX998R,KD-SX997R
3.3 Troubleshooting 3.3.1 Feed section
Is the voltage output at IC621 pin "40" 5V or 0V? YES Is 4V present at both sides of the feed motor? YES Check the feed motor.
3.3.2 Focus section
NO
Is the wiring for IC681 pin 27? NO
YES Is 3.3V present at IC681 pin "20"? YES Check the vicinity of IC621. YES Check the feed motor connection wiring.
NO Check CD 8V and 5V.
NO
Is 6V or 2V present at IC681 "4" and "5"? NO Check IC601.
When the lens is moving: 4V
Does the S-search waveform appear at IC681 pins "8" and "9"?
NO
Check the circuits in the vicinity of IC681 pins "8","9"and"15". YES
YES
Check the pickup and its connections
3.3.3 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
3.3.4 Tracking section
NO
Is 4V present at IC681 pins "6" and "7"? YES
NO
Is 4V present at IC621 pins "41" ? YES Check the vicinity of IC561.
NO
Check the spindle motor and its wiring NO Check the circuits in the NO vicinity of IC681 "19"~ "24" or the pickup
Check IC621 and IC681.
When the disc is rotated at first:
YES
Approx. 1.2V Is the tracking error signal output at IC601 "11"?
Check the circuit in the vicinity of IC501 pins "2"~"7".
