Record Bias Adjustment; Record Level Adjustment - Sony HCD-H551 Service Manual

Record Bias Adjustment (Deck B)
Procedure:
1. Press FUNCTION button to Select VIDEO.
2. Mode: record
VIDEO IN
1) 315Hz
2) 10kHz
AF OSC
attenuator
3. Mode: Playback
recorded
position
set
main board
CN403 Pin 3 (L-CH)
4. Confirm playback the signal recorded in step 2 become adjustment
level as follows.
If these levels do not adjustment level, adjust the RV341 (L-CH)
and RV441 (R-CH) on the MD board to repeat steps 2 and 3.
Adjustment level: The playback output of 10 kHz level difference
against 315 Hz reference should be ± 0.5 dB.
Adjustment Location: MD board
Adjustment Location:
[MD BOARD] (Conductor Side)
RV341 (L CH), 441 (R CH)

Record Bias Adjustment

RV651 (Normal speed)
RV301
RV652 (High speed)
Tape Speed Adjustment
RV341
RV401
RV441
RV301 (L CH), 401(R CH)
Playback Level Adjustment
(Deck B)
}
50 mV (–23.8 dB)
blank tape
600
CS-123
set
level meter
Pin 1 (R-CH)
RV651 RV652
RV311
RV411
RV311 (L CH), 411 (R CH)
Playback Level Adjustment
(Deck A)
Record Level Adjustment (Deck B)
Procedure:
1. Press FUNCTION button to Select VIDEO.
2. Mode: record
AF OSC
attenuator
3. Mode: Playback
recorded
portion
4. Confirm playback the signal recorded in step 2 become adjustment
level as follows.
If these levels do not adjustment level, adjust the RV301 (L-CH)
and RV351 (R-CH) on the main board to repeat steps 2 and 3.
Adjustment level:
CN403 PB level: 47.3 to 53.1 mV (–24.3 to –23.3 dB)
Adjustment Location: MAIN board
[MAIN BOARD] (Component Side)
RV351

Record Level Adjustment

(R CH)
— 13 —
VIDEO IN
315kHz 50mV (–23.8 dB)
blank tape
600
CS-123
set
level meter
set
main board
CN403 Pin 3 (L-CH)
Pin 1 (R-CH)
1 3
RV351
CN403
IC401
RV301
RV301
Record Level Adjustment
(L CH)