Sony HCD-GR3 Service Manual page 15

E-F Balance Check
oscilloscope
BD board
TP (TEO)
TP (VC)
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
0V
A – B
Specified level: •
2 (A + B)
• 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
level: 300 ± 100 mVp-p
x 100 = less than ± 7%
Adjustment Location:
[BD BOARD] — Component Side —
RF
RV101
RV103
FEO
TEO
RV102
VC
IC104
[MAIN BOARD] — Conductor Side —
IC701
TP703
(ADJ2)
— 15 —
FOK
IC101
TEI
FEI
PCK
GND