Sony SA-VA100 Service Manual page 34

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E-F Balance Check
CD board
TP (TEO)
TP (VC)
Procedure:
1. Set the DISC (YEDS-18) in chucking mode.
2. Connect the test point TP (ADJ) of CD board and the ground.
3. Connect oscilloscope to test point TP (TEO).
4. Press DOLBY NR button, p button and DISC 1 button at the
same time in the STANDBY mode.
5. Playback the disc and press the DISC 4 button. (Tracking /sled
OFF)
6. Confirm that the oscilloscope waveform is symmetrical on the
top and bottom in relation to 0Vdc, and check this level.
Traverse waveform
0V
TE
L 13942296513
A – B
Specified level: • x 100 = less than ± 7%
2 (A + B)
• A + B = 250 ± 70 mVp-p
7. Turn the power supply OFF, and remove the read wire connected
in step 2.
Adjustment Location:
[CD BOARD] (Conductor Side)
RV102
TEO
TEI
FEI
VC
RV103
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oscilloscope
A
B
level: 250 ± 70 mVp-p
RV101
RF
FOK
FEO
IC103
PCK
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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.
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ADJ
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