Read Sony CFD-CD777S Service Manual online
– 16 –
CD SECTION
Notes on Adjustment
1. Perform adjustment in test mode.
After adjustments, 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
3. Use the disc (YEDS-18. Part No. 3-702-101-01) only when so
indicated.
How to Put the Set into Test Mode
1. Short-circuit the JW811 and JW812 on the CONTROL board.
2. Turn on the power.
3. Open the short-circuit to release test mode.
2. Turn on the power.
3. Open the short-circuit to release test mode.
[CONTROL Board] (Component Side)
+
–
–
MAIN board
Solder bridge (TRACKING)
TP (VC)
oscilloscope
(DC range)
A
B
A
B
A=B
0 V
0 V
C
A=B C=180 mVp-p to 420 mVp-p
E-F Balance Adjustment
This adjustment is to be done when the optical pick-up is replaced.
Procedure:
1. Connect the oscilloscope to solder bridge (TRACKING) and
TP (VC) on the MAIN board.
2. Put the set into test mode.
3. Optical pick-up setting to the center by
3. Optical pick-up setting to the center by
+ or = button
pushing.
4. Put the disc (YEDS-18) and press
^ button.
From focus searching, focus is turned ON while entering
CLV drawing-in mode. Tracking and sled are turned OFF.
CLV drawing-in mode. Tracking and sled are turned OFF.
5. Adjust RV703 so that the oscilloscope traverse waveform is
symmetrical, as shown in the figure below.
6. Release the test mode after adjustment is completed.
Note: Take long sweep time
for easy monitoring.
VOLT/DIV : 0.2 V (with the 10:1 probe in use.)
TIME/DIV : 5 ms
TIME/DIV : 5 ms
Adjustment Location: MAIN board (See page 19.)
Before Begining Adjustment
Put the set into test mode and perform the following checks.
Repair if there are any problems.
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.
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
= : Optical pick-up moves to the inner circumference
• Focus Search Check
1. Press the
^ 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, when no catching or abnormal
noises.
noises.
3. Press the
p button.
Confirm that focus search operation stops. If it does not , press
the
the
p button again longer.
LCD801
IC801
JW811
JW812
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