Sony HCD-D670AV - Compact Disk Deck Receiver - Record Bias Current Adjustment (Deck B); Record Level Adjustment (Deck B)

— 13 —
VIDEO IN
1) 315Hz
2) 10kHz
50mV (–23.8dB)
blank tape
CS-123
AF OSC
attenuator
600
Ω
set
Record Bias Current Adjustment DECK B
Procedure :
1. Mode : record
2. Mode : Playback
recorded
position
set
level meter
CN 403 (Pin
3 : L-CH)
(Pin 1 : R-CH)
Confirm playback the signal recorded in step 1 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 step 1 and 2.
Adjustment level : The playback output of 10 kHz level difference
against 315Hz reference should be ± 0.5 dB
Adjustment Location : MD board
Record Level Adjustment DECK B
Procedure :
1. Mode : record
VIDEO IN
315Hz, 50mV (–23.8dB)
AF OSC
attenuator
600
Ω
blank tape
CS-123
set
2. Mode : Playback
recorded
position
set
level meter
main board
CN403 (Pin
3 : L-CH)
(Pin 1 : R-CH)
Confirm playback the signal recorded in step 1 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 1 and 2.
Adjustment level: CN 403 PB level: 47.2 to 53.0 mV
(–24.3 to –23.3 dB)
Adjustment Location : main board
Adjustment Location
[MAIN BOARD] (Component Side)
RV351 REC LEVEL (R-CH)
RV301 REC LEVEL
(L-CH)
1
3
CN403
– DECK B –
RECORD
BIAS
L
RV441
RV341
(NORMAL)
RV651
¬
R
TAPE SPEED
(HIGH)
RV652
¬
PB
LEVEL
L
¬
R ¬
– DECK A –
[MD BOARD] (Conductor Side)
PB LEVEL
RV301
¬ L
RV401 ¬ R