PMC-D407L - Sony Audio Service Manual (repair manual). Page 18

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The following is a simple adjustment method.

Since exact adjustment cannot be performed, remember the posi-
tions of the controls before performing the adjustment. If the posi-
tions after the primary adjustment are only a little different, return
the controls to the original position.

Procedure:
1. Keep the set horizontal.

If the set is not horizontal, this adjustment cannot be performed
due to the gravity against the 2-axis device.

2. Connect the oscilloscope TP (FOCUS-Y) and TP (VC) on the

CD board.

3. Insert the disc (YEDS-18) in and close the lid for CD.
4. Put the set into test mode. (See page 16.)
5. Press the 

( button.

From focus searching, focus is turned ON while entering
CLV drawing-in mode. Tracking and sled are turned OFF.

6. Press the 

( button.

[Both tracking and sled are turned ON.]

7. Adjust RV702 so that the waveform is as shown in the figure

below. (Focus gain adjustment)

100 mV

0 V

low focus gain

0 V

250 mV

high focus gain

VOLT/DIV: 100 mV
TIME/DIV:2ms

VOLT/DIV: 100 mV
TIME/DIV:2ms

VOLT/DIV: 100 mV
TIME/DIV:2ms

100 mV
75 mV

0 V

• Inconnect Examples (DC level changes more than on adjusted

waveform)

high tracking gain
high fundamental wave
than for low gain

VOLT/DIV: 1 V
TIME/DIV:2 ms

0 V

low tracking gain

VOLT/DIV: 1 V
TIME/DIV: 2ms

0 V

0 V

VOLT/DIV: 1 V
TIME/DIV: 2ms

8. Connect the oscilloscope to TP (TRACKING-Y) and TP (VC)

on the CD board.

9. Adjust RV704 so that the waveform is as shown in the figure

below. (tracking gain adjustment)

• Incorrect Examples (fundamental wave appears)

VOLT/DIV: with the 10:1 probe in used.

10. Release test mode after adjustment is completed.

Adjustment Location: CD board (See page 19.)

+
–

TP (FOCUS-Y)

TP (TRACKING-Y)

TP (VC)

oscillosope
(DC range)

CD board