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TAPE ADJUSTMENT & CHECK TABLE
TEST
RECORDER
CASSETTE
MODE
SBC420
MOTOR SPEED
PLAY
3150Hz
SBC420
WOW & FLUTTER
PLAY
3150Hz
PLAY FWD
SBC420
ADJUST AZIMUTH
10kHz
PLAY REV ^
PLAYBACK
PLAY
SBC420
FREQ. RESPONSE
CHECK RECORD/PLAYBACK FREQUENCY AND DISTORTION
Inject 8.85mV signals
100Hz, 250Hz, 1kHz,
SBC419A
10kHz, 12.5kHz
or
RECORD
SBC420
via
or
3
4
RECORDED
PLAY
CASSETTE
Inject 1kHz 28mV
SBC419A
or
RECORD
via
or
3
4
SBC420
RECORDED
PLAY
CASSETTE
SBC419A : 4822 397 30069
SBC420 : 4822 397 30071
level(dB)
8dB
6dB
250
80
4k
12.5k (AR)
10k (Non-AR)
figure. 1
9-3
ADJUST
MEASURE
READ ON
ON
with
frequency
check
3150Hz +/- 2%
counter
check
W&F-meter
< 0.4 % DIN
or
1
2
left hand screw
max. output level
LEFT RIGHT
mV-meter
& left=right
right hand screw
mV-meter
check
limits see fig. 1 *
1
or
2
mV-meter
check
limits see fig. 2 *
LEFT RIGHT
1
or
2
THD-meter
check
LEFT RIGHT
^
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
level(dB)
8dB
8dB
6dB
f(Hz)
250
100
4k
figure. 2
HEF4094BT FUNCTIONAL BLOCK DIAGRAM
16
to
V
DD
D
2
8-STAGE SHIFT
CP
REGISTER
3
8-BIT STORAGE
STR
1
REGISTER
EO
15
3-STATE OUTPUTS
O
O
O
O
0
1
2
3
V
SS
8
4
5
6
7
AF Control Logic State Table
< 3% *
State of Module
CR_SEL
Stop
Playback (Ferro)
Playback (Chrome)
Record (Ferro)
Record (Chrome)
FWD
REW
Note:
0 = Logic Low
8dB
1 = Logic High
X = Not applicable
f(Hz)
10k
9-3
O
'
S
10
O
S
9
O
O
O
O
4
5
6
7
14
13
11
12
Control lines from HEF4094BT
O
O
O
O
O
O
0
1
2
3
4
5
REC
BIAS_OFF
CR_BIAS
SOL
0
0
1
X
0
0
1
0
1
0
1
1
0
1
0
0
1
1
0
1
0
0
1
X
0
0
1
X
O
O
6
7
MUTE_OFF
MOT
0
0
1
1
1
1
0
1
0
1
0
1
0
1
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