CFD-131 - Sony Audio Service Manual (repair manual). Page 17

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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 R720 on the CD board for stop operation of

anti-shock circuit. (See page 20.)

• Switch position
FUNCTION switch : CD

1. Short the solder bridge the TP (TEST) on the CONTROL board.
2. Insert the AC power plug.

  Release the shorted solder bridge the TP (TEST), the test mode is
  released.

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

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

1. Push the 

fl 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 

π button.

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

This adjustment is to be done when the optical pick-up block is
replaced.

1. Connect the oscilloscope between TP (TE) and TP (VC).
2. Put the set into test mode.
3. Push the CD lid to open and insert disc (YEDS-18).
4. Close the CD lid.
5. Press the 

± and ≠ buttons to move the optical pick-up to

the center.

6. Push the 

fl button.

7. Push the 

π button.

8. Push the 

fl button.

9. Adjust RV703 so that the oscilloscope traverse waveform is

symmetrical, as shown in the figure below.

10. Release test mode after adjustment is completed.

– control board (conductor side) –

IC801

25

24

TP

(TEST)

oscilloscope

(DC range)

CD board

TP (TE)(IC701 

$¢

)

TP (VC)(IC701 

$•

)

Adjustment Location : See page 20.

0V

A

B

A=B
A+B=0.5 ± 0.2 V