9-3 9-3
^ 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
PLAYBACK
FREQ. RESPONSE
TAPE ADJUSTMENT & CHECK TABLE
TEST
CASSETTE
RECORDER
MODE
MEASURE
ON
READ ON
ADJUST
with
MOTOR SPEED
SBC420
3150Hz
PLAY
frequency
counter
check
PLAY
PLAY FWD
PLAY REV ^
W&F-meter
mV-meter
left hand screw
right hand screw
max. output level
& left=right
WOW & FLUTTER
ADJUST AZIMUTH
3150Hz +/- 2%
< 0.4 % DIN
to
1
2
or
LEFT
RIGHT
Inject 8.85mV signals
100Hz, 250Hz, 1kHz,
10kHz, 12.5kHz
1
2
or
LEFT
RIGHT
Inject 1kHz 28mV
3
4
or
via
3
4
or
via
1
2
or
LEFT
RIGHT
RECORD
RECORD
PLAY
PLAY
mV-meter
THD-meter
check
check
limits see fig. 2 *
< 3% *
RECORDED
CASSETTE
RECORDED
CASSETTE
figure. 1
f(Hz)
level(dB)
8dB
6dB
12.5k (AR)
4k
250
80
8dB
f(Hz)
level(dB)
8dB
6dB
10k
4k
250
100
8dB
figure. 2
check
SBC419A : 4822 397 30069
SBC420 : 4822 397 30071
SBC420
3150Hz
SBC420
10kHz
SBC419A
or
SBC420
SBC419A
or
SBC420
SBC420
CHECK RECORD/PLAYBACK FREQUENCY AND DISTORTION
limits see fig. 1 *
10k (Non-AR)
8-STAGE SHIFT
REGISTER
8-BIT STORAGE
REGISTER
3-STATE OUTPUTS
10
9
11
12
13
14
7
6
54
15
1
3
2
V
DD
VSS
O
7
O
6
O
0
O
1
O
2
O
3
O
4
O
5
O
S
’
O
S
D
CP
STR
EO
8
16
HEF4094BT FUNCTIONAL BLOCK DIAGRAM
State of Module
Stop
Playback (Ferro)
Playback (Chrome)
Record (Ferro)
Record (Chrome)
FWD
REW
O0
CR_SEL
0
0
1
0
1
0
0
O
1
REC
0
0
0
1
1
0
0
O
2
BIAS_OFF
1
1
1
0
0
1
1
O
3
CR_BIAS
X
0
1
0
1
X
X
O
7
MOT
0
1
1
1
1
1
1
O
6
MUTE_OFF
0
1
1
0
0
0
0
O
4
Not in used
O5
SOL
Deck Mechanism Timing
Control lines from HEF4094BT
AF Control Logic State Table
Note: 0 = Logic Low
1 = Logic High
X = Not applicable
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