Read Sony PMC-D307L / PMC-D40L Service Manual online
– 14 –
E-F Balance Adjustment
This adjustment is to be done when the optical pick-up is replaced.
Procedure:
1. Connect the oscilloscope to TP (TRACKING-Y) and TP (VC)
on the CD board.
2. Insert the disc (YEDS-18) in and close the lid (CD).
3. Put the set into test mode.
4. Press the
3. Put the set into test mode.
4. Press the
+ and = buttons to move the optical pick-up to
the center.
5. Press the
( 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.
6. Adjust RV703 so that the oscilloscope traverse waveform is sym-
metrical, as shown in the figure below.
A
B
0 V
A
B
0 V
A=B
Note: Take long sweep time
for easy monitoring.
VOLT/DIV: 0.2 V (with the 10:1 probe in use.)
TIME/DIV: 1 ms
TIME/DIV: 1 ms
A=B
Adjustment value: 0.4
±
0.2 Vp-p (A + B)
7. Release the test mode after adjustment is completed.
Adjustment Location: CD board (See page 17.)
+
–
–
CD board
TP (TRACKING-Y)
TP (VC)
oscilloscope
(DC range)
TEST 1
Terminal
Terminal
How to Release the Test Mode
1. Be sure to disconnect the AC plug cord and remove the solder
bridge at the TEST1 terminal connected before in setting.
2. The set thus becomes available for normal operation
Before Beginning 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 con-
tinuously.)
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.
Note: When the malfunction is occurred by mis-passing other keys, turn
off the power and check again from making the test mode.
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. Disconnect an AC plug cord. (Power is not applied to the set.)
2. Solder across the TEST1 terminal.
3. Close the lid (CD).
4. Connect an AC plug cord.
2. Solder across the TEST1 terminal.
3. Close the lid (CD).
4. Connect an AC plug cord.
[SW (A) BOARD] (Conductor Side)
CD SECTION
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