Sony HCD-GRX50 Service Manual page 16

DECK B
REC Bias Adjustment
Procedure:
1. Mode: Record
FUNCTION: VIDEO
main board
VIDEO (AUDIO) IN jack (J101)
L-CH, R-CH
1) 315 Hz
2) 10 kHz
AF OSC
600
attenuator
2. Mode: Playback
recorded
portion
set
main board
MD OUT jack (J101)
L-CH, R-CH
3. Confirm playback the signal recorded in step 1 become speci-
fication values as follows.
If these values are out of specification values, adjust the RV341
(L-CH) and RV441 (R-CH) on the AUDIO board to repeat
steps 1and 2.
Specification values: Playback output of 315 Hz to playback
output of 10 kHz: ± 0.5 dB
Adjustment Location: AUDIO board
REC Level Adjustment
Procedure:
1. Mode: Record
FUNCTION: VIDEO
main board
VIDEO (AUDIO) IN jack (J101)
L-CH, R-CH
315 Hz, 50 mV (–23.8 dB)
AF OSC
600
attenuator
2. Mode: Playback
recorded
portion
set
main board
MD OUT jack (J101)
L-CH, R-CH
3. Confirm playback the signal recorded in step 1 become speci-
fication values as follows.
If these values are out of specification values, adjust the RV301
(L-CH) and RV351 (R-CH) on the MAIN board to repeat steps
1 and 2.
50 mV (–23.8 dB)
blank tape
CN-123
set
level meter
+
–
DECK B
blank tape
CS-123
set
level meter
+
–
Specification values:
J101 PB level: 47.2 to 53.0 mV (–24.3 to –23.3 dB)
Adjustment Location: MAIN board
– MAIN BOARD (Conductor Side) –
RV301
L
IC301
REC LEVEL
RV351
R
– AUDIO BOARD (Component Side) –
RV441
RV401
IC602
RV301
RV341
L R R L
PB LEVEL REC BIAS
– DECK B –
– LEAF SW BOARD (Component Side) –
TAPE SPEED
(NORMAL) (HIGH)
RV1002 RV1001
– 16 –
VIDEO (AUDIO) IN
(L/R)
J101
MD OUT
(L/R)
CN601
RV311 RV411
L R
PB LEVEL
– DECK A –
CN1001