Read Sony HCD-N555AVK / LBT-N555AVK Service Manual online
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E-F Balance Check
BD board
TP (TEO)
TP (VC)
oscilloscope
Procedure :
1. Connect test point TP703 (ADJ 2) on Main board to Ground with
1. Connect test point TP703 (ADJ 2) 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
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
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.
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)
Adjustment Location :
[BD BOARD] (Conductor Side)
[MAIN BOARD] (Conductor Side)
RF
FOK
RV101
RV103
IC101
IC102
TEI
FEI
TEO
RV102
VC
IC104
GND
PCK
IC701
B
A
FEO
TP703
(ADJ 2)
(ADJ 2)
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