Read Sony CDP-M7 / DHC-MD7 Service Manual online
— 10 —
Adjustment Location
[BD BOARD] — Component Side —
E-F Balance Check
Procedure:
1. Connect a lead wire to the test point TP501 on Display board.
2. Connect oscilloscpe to test point TP (TEO) on BD board.
3. Turned power switch on, load the disc (YEDS-18).
4. Connect a lead wire connected to the test point TP501 to ground.
5. Press the TIME button. (TRACKING SERVO OFF)
6. Playback the disc (YEDS-18).
7. Confirm that the oscilloscope waveform is symmetrical on the
1. Connect a lead wire to the test point TP501 on Display board.
2. Connect oscilloscpe to test point TP (TEO) on BD board.
3. Turned power switch on, load the disc (YEDS-18).
4. Connect a lead wire connected to the test point TP501 to ground.
5. Press the TIME button. (TRACKING SERVO OFF)
6. Playback the disc (YEDS-18).
7. Confirm that the oscilloscope waveform is symmetrical on the
top and bottom in relation to 0Vdc, and check this level.
Traverse waveform
oscilloscope
BD board
TP (TEO)
TP (VC)
TP (VC)
IC104
GND
PCK
RF
RV101
IC101
FOK
RV102
TEO
FEO
TEI
FEI
VC
RV103
IC102
TP501
IC501
A
B
level: 300 ± 100 mVp-p
0V
A – B
2 (A + B)
Specified level: • x 100 = less than ± 7%
• A + B = 300 ± 100 mVp-p
8. Remove the lead wire connected in step 1.
Focus/Tracking Gain Adjustment (RV102, RV103)
This gain has a margin, so even if it is slightly off.
There is no problem.
Therfore, do not perform this adjustment.
Please note that it should be fixed to mechanical center position when
you moved and do not know original position.
There is no problem.
Therfore, do not perform this adjustment.
Please note that it should be fixed to mechanical center position when
you moved and do not know original position.
[DISPLAY BOARD] — Conductor Side —
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