Sony HCD-GRX5 Service Manual page 15

DECK B
REC Bias Adjustment
Procedure:
INTRODUCTION
When set to the test mode performed in Tape Speed Adjust-
ment, 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.
(If do not operation of stopped from recording complete, and press
– 0 button then rewind to recording start position.)
[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
50 mV (–23.8 dB)
2) 10 kHz
AF OSC
600
attenuator
5. Mode: Playback
recorded
portion
set
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 Adjust-
ment, 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.
(If do not operation of stopped from recording complete, and press
– 0 button then rewind to recording start position.)
[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]
r button, press P button, then recording
3. After press
start.
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
set
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
[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
set
level meter
+
–
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