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General
TEST
RECORDER
CASSETTE
MODE
ADJUST MOTOR SPEED
HIGH SPEED
SBC420
DUBBING
(4822 397 30071)
PLAY B
3150Hz
NORMAL SPEED
PLAY A
CHECK WOW & FLUTTER
SBC420
DECK A & B
(4822 397 30071)
PLAY
3150Hz
ADJUST AZIMUTH
SBC420
PLAY FWD
(4822 397 30071)
DECK A & B
10kHz
PLAY REV #
Playback
TEST
RECORDER
CASSETTE
MODE
ADJUST DOLBY PLAYBACK LEVEL *
DECK A
PLAY
TCC-130
(4822 397 30269)
DECK B
PLAY FWD
200nWb/m
PLAY REV #
CHECK PLAYBACK FREQUENCY RESPONSE
SBC420
PB. FREQ. RESP.
PLAY
(4822 397 30071)
* For Dolby version only
# For Auto-reverse version only
level(dB)
Dolby version
3dB
4dB
f(Hz)
250
10k
12.5k
9A-6
ADJUST
MEASURE
READ ON
with
ON
5040Hz ± 0.5%
3622 *
frequency
1
or
2
3150Hz ± 0.5%
3620
counter
LEFT
RIGHT
check
3150Hz -0.8/+1.8%
≤0.4 % DIN or
1
or
2
W&F-meter
check only
≤0.35 % CCIR *
LEFT
RIGHT
left hand screw
max. output level
1
or
2
mV-meter
& left=right
right hand screw
LEFT
RIGHT
ADJUST
MEASURE
READ ON
with
ON
3641(L), 3642(R)
548mV ±0.5dB
7
or
8
3635(L), 3636(R)
mV-meter
LEFT
RIGHT
548mV ±1dB
Check
1
or
2
mV-meter
Check
limits see fig.1
LEFT
RIGHT
level(dB)
Non-Dolby version
8dB
6dB
8dB
f(Hz)
80
250
4k
12.5k
figure. 1
Recording
TEST
to
CASSETTE
PRE-ADJUST BIAS AND BIAS-SYMMETRY
CrO
DECK B
FERRO
CHECK OVERALL FREQUENCY RESPONSE AND DISTORTION
Inject 3mV signals
100Hz, 250Hz, 1kHz,
CrO
10kHz, 12.5kHz
via
3
or
4
RECORDED
CASSETTE
Inject 1kHz 8.85mV
CrO
via
3
or
4
RECORDED
to
CASSETTE
Remark: If high frequencies are not within limits, decrease bias and re-measure.
If distortion is too high increase bias and re-measure.
ADJUST DOLBY RECORD LEVEL *
Inject 400Hz 8.85mV
CrO
via
3
or
4
RECORDED
CASSETTE
Remark: If measured value is out, re-adjust record level up or down slightly to attain play level.
* For Dolby version only
level(dB)
Dolby version
250
9A-6
MEASURE
RECORDER
READ ON
ON
MODE
2
5
or
6
RECORD
mV-meter
LEFT
RIGHT
RECORD
2
1
or
2
mV-meter
PLAY
LEFT
RIGHT
RECORD
2
1
or
2
THD-meter
PLAY
LEFT
RIGHT
9
or 10
RECORD
mV-meter
2
LEFT
RIGHT
7
or
8
mV-meter
PLAY
LEFT
RIGHT
level(dB)
Non-Dolby version
8dB
3dB
5dB
10dB (HSD)
f(Hz)
250
10k
12.5k
100
figure. 2
ADJUST
with
to
3773
995mV
3785 *
left = right
750mV ± 1.5dB
check only
check only
limits see fig.2
≤3%
check only
3655 & 3556
420mV
170mV ± 1dB
check
6dB
8dB
10dB (HSD)
f(Hz)
4k
10k
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