11-2 11-2
PCS 104 197
# For Auto-reverse version only
* If high frequencies are not within limits, decrease bias and re-measure.
If distortion is too high, increase bias and re-meaure
PLAY
mV-meter
check
limits see fig.1
CHECK PLAYBACK FREQUENCY RESPONSE
TAPE ADJUSTMENT & CHECK TABLE
TEST
CASSETTE
RECORDER
MODE
MEASURE
ON
READ ON
ADJUST
with
ADJUST MOTOR SPEED
SBC420
3150Hz
PLAY B
PLAY A
frequency
counter
3620
check
NORMAL SPEED
PLAY
PLAY FWD
PLAY REV #
W&F-meter
mV-meter
left hand screw
right hand screw
max. output level
& left=right
CHECK WOW & FLUTTER
DECK A & B
ADJUST AZIMUTH
3150Hz ± 0.5%
3150Hz -0.8/+1.8%
≤0.4 % DIN
DECK A & B
to
mV-meter
DECK B
ADJUST BIAS CURRENT
RECORD
5
6
or
LEFT
RIGHT
1
2
or
LEFT
RIGHT
1
2
or
LEFT
RIGHT
1
2
or
LEFT
RIGHT
1
2
or
LEFT
RIGHT
CHECK OVERALL FREQUENCY RESPONSE AND DISTORTION
Inject 3mV signals
100Hz, 250Hz, 1kHz,
10kHz, 12.5kHz
1
2
or
LEFT
RIGHT
Inject 1kHz 8.85mV
3
4
or
via
3
4
or
via
1
2
or
LEFT
RIGHT
RECORD B
RECORD B
PLAY B
PLAY B
mV-meter
THD-meter
check
check
limits see fig. 2 *
≤3% *
RECORDED
CASSETTE
RECORDED
CASSETTE
995mV
750mV ± 1.5dB
3773
check
figure. 1
f(Hz)
level(dB)
8dB
6dB
12.5k
4k
250
80
8dB
f(Hz)
level(dB)
8dB
10dB (HSD)
6dB
10k
4k
250
100
8dB
10dB (HSD)
figure. 2
check
SBC419A : 4822 397 30069
SBC420 : 4822 397 30071
SBC420
3150Hz
SBC420
10kHz
SBC420
DECK A & B
SBC419A
SBC420
SBC419A
or
SBC420
SBC419A
or
SBC420
REC
FWD
CRO2
REC
REV
MODE
SW
TO ETF6-FE BOARD
CONNECTOR 1710
TAPE DECK WIRING
TAPE DECK
MOTOR
TO ETF6-FE BOARD 1760
Solenoid
_
+
NC
NC
8. Gnd
7. Mode SW
6. Vcc 12V
5. Sol.
4. Photo Out
3. CrO2 SW
2. Rec SW Forward
1. Rec SW Reverse
Solenoid
R1 = 680R
Photo Sensor
Mode
CrO2
TAPE MECHANISM ELECTRONICS
+
-
Motor
Rec-F
Rec-R
Rec/Pb
Head
Head wire
connector pcb
1. +L ch (White)
2. Earth (Black)
3. +R ch (Red)
4. E Head (Blue)
5. E Head (Yellow)
Variation table for Analog Circuit
Autoreverse (FR)
12k
12k
1k2
1k2
12k
4k7
10k
Non-Autoreverse (FF)
15k
15k
1k
1k
8k2
5k6
8k2
Item No.
3723
3724
3743
3744
3769
3772
3774
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