Sony HCD-GRX9000 Service Manual page 15

DECK B
REC Bias Adjustment
Procedure:
INTRODUCTION
When set to the test mode performed in Tape Speed Adjustment,
when the tape is rewound after recording, the "REC memory mode"
which rewinds only the recorded portion and playback is set.
This "REC memory mode" is convenient for performing this ad-
justment. During recording, the input signal FUNCTION will au-
tomatically switch to VIDEO.
(After recording, press the – 0 button without stopping will
return to the position where recording was started.)
[FUNCTION]
1. Press button to select VIDEO. (This step is not
necessary if the above test mode has already been set.)
2. Insert a tape into deck B.
[ REC]
button, press P button, then recording
3. After press r
start.
4. Mode: Record
MD/VIDEO (AUDIO) IN

1) 315 Hz

2) 10 kHz 
AF OSC
600 Ω
attenuator
+ +
+
–
– –
5. Mode: Playback
recorded
portion
set
MAIN board
CN301 (Pin 3 : L-CH)
6. Confirm playback the signal recorded in step 3 become ad-
justable level as follows.
If these levels do not adjustable level, adjustment the RV341
(L-CH) and RV441 (R-CH) on the AUDIO board to repeat
steps 4 and 5.
Adjustable level: Playback output of 315 Hz to playback output
of 10 kHz: ± 1.0 dB
Adjustment Location: AUDIO board
REC Level Adjustment
Procedure:
INTRODUCTION
When set to the test mode performed in Tape Speed Adjustment,
when the tape is rewound after recording, the "REC memory mode"
which rewinds only the recorded portion and playback is set.
This "REC memory mode" is convenient for performing this ad-
justment. During recording, the input signal FUNCTION will au-
tomatically switch to VIDEO.
(After recording, press the – 0 button without stopping will
return to the position where recording was started.)
[FUNCTION]
1. Press button to select VIDEO. (This step is not
necessary if the above test mode has already been set.)
2. Insert a tape into deck B.
[ REC]
button, press P button, then recording
r
3. After press
start.
50 mV (–23.8 dB)
blank tape
CN-123
set
level meter
+
–
(Pin 1 : R-CH)
DECK B
4. Mode: Record
MD/VIDEO (AUDIO) IN
315 Hz, 50 mV (–23.8 dB)
AF OSC
attenuator
+ + +
–
–
–
5. Mode: Playback
recorded
portion
6. Confirm playback the signal recorded in step 3 become ad-
justable level as follows.
If these levels do not adjustable level, adjustment the RV301
(L-CH) and RV351 (R-CH) on the MAIN board to repeat steps
4 and 5.
Adjustable level:
CN301 PB level: 47.2 to 53.0 mV (–24.3 to –23.3 dB)
Adjustment Location: MAIN board
Adjustment Location:
[MAIN BOARD] (Component 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
– 15 –
600 Ω
set
level meter
+
set
–
MAIN board
CN301 (Pin 3 : L-CH)
(Pin 1 : R-CH)

RV301


REC LEVEL

1 3 

CN301

RV351

CN107
CN601
RV311 RV411
L R
PB LEVEL
– DECK A –
CN1001
blank tape
CS-123
L
CN106
R