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HTC-NX1, MHC-NX1, MHC-NX3AV - Sony Audio Service Manual (repair manual). Page 16

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16
REC Bias Adjustment
   DECK B
Procedure:
1. Mode: Record
2. Mode: Playback
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
   DECK B
Procedure:
1. Mode: Record
2. Mode: Playback
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.
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) –
– LEAF  SW  BOARD (Component Side) –
RV401
RV301
RV341
RV311
RV411
IC602
CN601
L
R
R L
 
 
RV441
PB LEVEL
– DECK B –
REC BIAS
L
R
 
PB LEVEL
– DECK A –
TAPE SPEED
RV1002
RV1001
(NORMAL)  (HIGH)
CN1001
attenuator
1) 315 Hz
2) 10 kHz
50 mV (–23.8 dB)
PFJ-1
or
STR-NX1/
NX3
AUDIO IN jack
600 
Ω
blank tape
CN-123
AF OSC
set
+
–
recorded
portion
level meter
AUDIO OUT jack
PFJ-1
or
STR-NX1/
NX3
set
attenuator
315 Hz, 50 mV (–23.8 dB)
AUDIO IN jack
600 
Ω
blank tape
CN-123
AF OSC
PFJ-1
or
STR-NX1/
NX3
set
+
–
recorded
portion
level meter
AUDIO OUT jack
PFJ-1
or
STR-NX1/
NX3
set
RV351
(R-CH)
RV301
(L-CH)
IC301
REC
LEVEL
CN301
1
3
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