Sony HCD-D670AV - Compact Disk Deck Receiver Service Manual page 16

E-F Balance Check
BD board
TP (TEO)
TP (VC)
Procedure :
1. Connect test point TP (ADJ) on Main board to Ground with a lead
wire.
2. Connect oscilloscope 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 : • X 100=less than
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.
oscilloscope
A
B
level : 300 100 mVp-p
7%
— 16 —
Adjustment Location :
[BD BOARD] (Conductor Side)
RF
RV101
IC101
TEI
RV103
FEO
TEO
RV102
VC
IC104
GND
[MAIN BOARD] (Conductor Side)
IC701
TP701
(ADJ)
FOK
IC102
FEI
PCK