Offset Adjustment - Pioneer CLD-1010 Service Manual

CLD-1010
3. VCXO Offset Adjustment DSDC Assembly Adjustment
© Objective: To minimize the offset for the Spindle phase error comparator circuit
© Symptom if the adjustment is inadequate: The digital audio output is broken during LDD play back
(there is synchronized noise).
@ Measuring equipment | ¢ Oscilloscope ¢ LDD disc
and tools
@ Measurement point e DSDC assembly ¢ IC305 (CXD1135Q) Pin 3 (leads of R336, R338, and R361)
® Test disc and set e LDD disc play
@ Adjustment point * DSDC assembly VR301
DSDC assembly
Oscilloscope
0.2V/div
0.2mS/div
Connection diagram
(CXD1135Q) and measure the Spindle phase error out-
put voltage. :
(If it is difficult to measure at Pin 3 of IC305, meas- :
ure at the leads of one of the resistors connected to }
Pin 3, R336, R338, or R361.) i
2. Mount the LDD test disc. Play it.
Wave form
106