Read Sony PMC-D307L / PMC-D40L Service Manual online
– 16 –
The following is a simple adjustment method.
– Simple Adjustment –
Note:
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.
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.
+
–
–
TP (FOCUS-Y)
TP (TRACKING-Y)
TP (VC)
oscillosope
(DC range)
(DC range)
CD board
Procedure:
1. Keep the set horizontal.
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.
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 14.)
5. Press the
4. Put the set into test mode. (See page 14.)
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. 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
TIME/DIV:2ms
VOLT/DIV: 100 mV
TIME/DIV:2ms
TIME/DIV:2ms
VOLT/DIV: 100 mV
TIME/DIV:2ms
TIME/DIV:2ms
100 mV
75 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
high fundamental wave
than for low gain
VOLT/DIV: 1 V
TIME/DIV:2 ms
TIME/DIV:2 ms
0 V
low tracking gain
VOLT/DIV: 1 V
TIME/DIV: 2ms
TIME/DIV: 2ms
0 V
0 V
VOLT/DIV: 1 V
TIME/DIV: 2ms
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)
Note:
VOLT/DIV: with the 10:1 probe in used.
10. Release test mode after adjustment is completed.
Adjustment Location: CD board (See page 17.)
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