SONY PMC107L
Manual de Servicio

CD SECTION
Notes on Adjustment 1. Perform Traverse adjustment in test mode. After adjustment, be sure to release test mode. 2. Perform adjustments in the order given. 3. Use the disc (YEDS-18, Part No. 3-702-101-01) only when so indicated. 4. Short the both sides of R714 on the CD board for stop operation of anti-shock circuit. (See page 19.) � Switch position FUNCTION switch : CD � In case of Test Mode 1. Short the solder bridge the TP801 (TEST) on the key board. 2. Insert the AC power plug. � Release the Test Mode Release the shorted solder bridge the TP801 (TEST), the test mode is release.
�key board (conductor side) �

Before Adjustment Put the set into test mode and perform the following checks. Repair if there are any problems. � Sled Motor Check Press the ± , � buttons and confirm that the optical pick-up moves smoothly from the innermost to outermost circumference and back smoothly and with no catching or abnormal noises. ± : Optical pick-up moves to the outer circumference � : Optical pick-up moves to the inner circumference � Focus Search Check 1. Push the � button. (Focus search operation is performed continuously.) 2. Look at the optical pick-up objective lens and confirm the it moves up and down smoothly, with no catching or abnormal noises. 3. Push the � button. Confirm that focus search operation stops. If it does not, push the � button again longer. Traverse Adjustment This adjustment is to be done when the optical pick-up block is replaced. Procedure:
oscilloscope (DC range) CD board

TP801 (TEST)

TP (TE) TP (VC)

1. 2. 3. 4. 5. 6. 7. 8. 9. 10.

Connect the oscilloscope between TP (TE) and TP (VC). Put the set into test mode. Push the CD lid to open and insert disc (YEDS-18). Close the CD lid. Press the ± and � buttons to move the optical pick-up to the center. Push the � button. Push the � button. Push the � button. Adjust RV702 so that the oscilloscope traverse waveform is symmetrical, as shown in the figure below. Release test mode after adjustment is completed.

A 0V A=B B

Adjustment Location : See page 19.

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