Sony SA-VA100 Service Manual page 32

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3 7 63 1515 0
Record Bias Adjustment
Procedure:
1. Mode: record
VIDEO 1 IN
1) 315Hz
2) 10kHz
AF OSC
600 Ω
attenuator
2. Mode: Playback
recorded
position
set
VIDEO 1 OUT
3. Confirm playback the signal recorded in step 1 become adjust-
ment level as follows.
If these levels do not adjustment level, adjust the RV12 (L-CH)
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and RV22 (R-CH) on the AUDIO board to repeat steps 1 and 2.
Adjustment level: The playback output of 10 kHz level difference
against 315 Hz reference should be ± 0.5 dB.
Adjustment Location: AUDIO board
Adjustment Location
[AUDIO BOARD] (Conductor Side)
RV22
RV12
(R-CH)
(L-CH)
Record Bias
Playback
Level
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} 54.9 mV (–23 dB)
blank tape
CS-123
set
level meter
RV71
Tape Speed
RV21 (R-CH)
RV11 (L-CH)
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8
Record Level Adjustment
Procedure:
1. Mode: record
AF OSC
attenuator
2. Mode: Playback
recorded
portion
set
3. Confirm playback the signal recorded in step 1 become adjust-
ment level as follows.
Q Q If these levels do not adjustment level, adjust the RV203 (L-CH)
3 6 7 1 3
and RV204 (R-CH) on the TC board to repeat steps 1 and 2.
Adjustment level:
VIDEO 1 OUT level: 46.2 to 51.8 mV (–24.5 to –23.5 dB)
Adjustment Location: TC board
[TC BOARD] (Component Side)
CN202
CN201
RV203
Record Level (L-CH)
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2 9 9 4 2 8
VIDEO 1 IN
315Hz 54.9 mV (–23 dB)
blank tape
600 Ω
CS-123
set
level meter
VIDEO 1 OUT
1 5 0 5 8 2 9 9 4
CN204 CN203
IC203
RV204
Record Level(R-CH)
m
co
9 9
2 8 9 9