— 17 —
Adjustment Location:
[BD BOARD] — Component Side —
E-F Balance Check
Procedure:
1. Connect test point TP701 (ADJ) on Main board to Ground with a
lead wire.
2. Connect oscilloscpe to test point TP (TEO).
3. Turned Power switch on.
4. Put disc (YEDS-18) in and playback.
5. Confirm that the oscilloscope waveform is symmetrical on the
top and bottom in relation to 0Vdc, and check this level.
Traverse waveform
[MAIN BOARD] — Conductor Side —
IC701
TP701
(ADJ)
oscilloscope
BD board
TP (TEO)
TP (VC)
0V
A
B
level: 300 ± 100 mVp-p
Specified level: • x 100 = less than ± 7%
• A + B = 300 ± 100 mVp-p
6. 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.
A – B
2 (A + B)
RF
RV101
IC101
FOK
RV102
TEO
FEO
TEI
FEI
VC
RV103
IC104
GND
PCK
IC102
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