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Record Bias Current Adjustment
Procedure :
1. Mode : record
AF OSC
attenuator
2. Mode : Playback
recorded
position
Confirm playback the signal recorded in step 1 become adjustment
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L 13942296513
level as follows.
If these levels do not adjustment level, adjust the RV341 (L-CH) and
RV441 (R-CH) on the MD board to repeat step 1 and 2.
Adjustment level : The playback output of 10 kHz level difference
against 315Hz reference should be ± 0.5 dB
Adjustment Location : MD board
Record Level Adjustment
Procedure :
1. Mode : record
AF OSC
attenuator
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DECK B
VIDEO IN
1) 315Hz
50mV (–23.8dB)
2) 10kHz
blank tape
600 Ω
CS-123
set
level meter
set
CN 403 (Pin 3 : L-CH)
(Pin 1 : R-CH)
DECK B
VIDEO IN
315Hz, 50mV (–23.8dB)
blank tape
600 Ω
CS-123
set
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2 9
8
2. Mode : Playback
recorded
position
Confirm playback the signal recorded in step 1 become adjustment
level as follows.
If these levels do not adjustment level, adjust the RV301 (L-CH) and
RV351 (R-CH) on the main board to repeat steps 1 and 2.
Adjustment level: CN 403 PB level: 47.2 to 53.0 mV
Adjustment Location : main board
Adjustment Location
[MAIN BOARD] (Component Side)
Q Q
3
6 7
1 3
1 5
[MD BOARD] (Conductor Side)
RECORD
BIAS
R
RV301 ¬ L
RV401 ¬ R
RV441 RV341
PB LEVEL
– DECK B –
co
.
— 13 —
9 4
2 8
level meter
set
main board
CN403 (Pin 3 : L-CH)
(Pin 1 : R-CH)
(–24.3 to –23.3 dB)
1
RV351 REC LEVEL (R-CH)
3
0 5
8
2 9
9 4
2 8
CN403
RV301 REC LEVEL
(L-CH)
TAPE SPEED
L
(NORMAL)
(HIGH)
RV651
RV652
¬
L ¬
PB
LEVEL
R ¬
m
– DECK A –
9 9
9 9
¬
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