CFD-Z125, CFD-Z135 - Sony Audio Service Manual (repair manual). Page 20

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1.

Perform 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, Parts No. 3-702-101-01) only when
so indicated.

1.

Short-circuit the pin 

#∞ and GND of IC801 on the CD

DECODER board as shown.

2.

Insert the AC plug cord into the power outlet and turned ON
the power switch.

3.

The LCD display change in 5 ways, and stop when they all
light up. (The unit sets in the test mode after the above steps.)

4.

Remove the short-circuit connected in step 1.

1.

Turn OFF the power switch.

2.

The set thus becomes available for normal operation.

Put the set into test mode and perform the following  checks.
Repair if there are any problems.

Press ± , ≠ 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.

1.

Press the CD ± button. (Focus search operation is performed
continuously.)

2.

Look at the optical pick-up objective lens and confirm that it
moves up and down smoothly, with no catching or abnormal
noises.

3.

Press π button.
Confirm that focus search operation stops. If it does not, press
the π button again longer.

GND

Jumper

IC801
pin-35