10 - 3
10 - 3
EXPLODED VIEW - TAPE MODULE
1000
3
2
1001
1002
1
3139 118 78730_Module Tape Deck ETF8 SD dd wk0125
TAPE ADJUSTMENT & CHECK TABLE
^
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
125mV +/- 3dB
(see fig.1 for freq.
response)
PLAYBACK LEVEL
& FREQ. RESPONSE
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
/- 2%
< 0.4 % DIN
to
1
2
or
LEFT
RIGHT
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
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
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
315Hz
CHECK RECORD/PLAYBACK FREQUENCY AND DISTORTION
Summary of Contents for MC-M250
Page 13: ...6 1 6 1 CIRCUIT DIAGRAM LED BOARD LAYOUT DIAGRAM LED BOARD ...
Page 15: ...7 2 7 2 LAYOUT DIAGRAM FRONT BOARD ...
Page 16: ...7 3 7 3 LAYOUT DIAGRAM FRONT BOARD ...
Page 29: ...11 4 11 4 LAYOUT DIAGRAM COMBI BOARD ...
Page 30: ...11 5 11 5 3583 LAYOUT DIAGRAM COMBI BOARD ...
Page 34: ...COMBI BOARD LAYOUT DIAGRAM For production after week 0303 11 9 11 9 ...
Page 35: ...11 10 11 10 COMBI BOARD LAYOUT DIAGRAM For production after week 0303 ...