Sony MHC-NX1 Service Manual page 59

DECK B
REC Bias Adjustment
Procedure:
1. Mode: Record
AUDIO IN jack
1) 315 Hz
50 mV (–23.8 dB)
2) 10 kHz
AF OSC
600
attenuator
2. Mode: Playback
recorded
portion
set
STR-NX1/
3. Confirm playback the signal recorded in step 1 become speci-
fied value as follows.
If these values are out of specified value, adjust the RV341 (L-
CH) and RV441 (R-CH) on the AUDIO board to repeat steps
1and 2.
Specified value: 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
AUDIO IN jack
315 Hz, 50 mV (–23.8 dB)
AF OSC
600
attenuator
2. Mode: Playback
recorded
portion
set
3. Confirm playback the signal recorded in step 1 become speci-
fied value as follows.
If these values are out of specified value, adjust the RV301 (L-
CH) and RV351 (R-CH) on the MAIN board to repeat steps 1
and 2.
16
blank tape
CN-123
PFJ-1
or
set
STR-NX1/
NX3
level meter
PFJ-1
or
+
–
NX3
AUDIO OUT jack
DECK B
blank tape
CN-123
PFJ-1
or
set
STR-NX1/
NX3
level meter
PFJ-1
or
+
STR-NX1/
–
NX3
AUDIO OUT jack
Specified value:
AUDIO OUT jack PB level: 47.2 to 53.0 mV (–24.3 to –23.3 dB)
Adjustment Location: MAIN board
– MAIN BOARD (Conductor Side) –
– 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
RV351
(R-CH)
IC301
REC
LEVEL
RV301
(L-CH)
CN301
CN601
RV311 RV411
L R
PB LEVEL
– DECK A –
CN1001
1
3