— 14 —
E-F Balance Check
Procedure:
1. Connect test point TP703 (ADJ2) 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
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)
A
B
level: 300 ± 100 mVp-p
0V
oscilloscope
BD board
TP (TEO)
TP (VC)
Adjustment Location:
[BD BOARD] — Component Side —
IC104
IC101
IC102
RF
RV101
RV103
TEO
FEO
FOK
TEI
FEI
RV102
VC
PCK
GND
[MAIN BOARD] — Conductor Side —
IC701
TP703
(ADJ2)
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