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Philips MCM765/85 Service Manual page 26

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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 LEVEL
SBC420
PLAY
& FREQ. RESPONSE
315Hz
CHECK RECORD/PLAYBACK FREQUENCY AND DISTORTION
Inject 3mV signals
100Hz, 250Hz, 1kHz,
SBC419A
10kHz, 12.5kHz
or
RECORD
SBC420
via
3
or
4
RECORDED
PLAY
CASSETTE
Inject 1kHz 8.85mV
SBC419A
or
RECORD
via
or
3
4
SBC420
RECORDED
PLAY
CASSETTE
SBC419A : 4822 397 30069
^
SBC420 : 4822 397 30071
*
level(dB)
8dB
6dB
8dB
80
250
4k
12.5k
figure. 1
8 - 3
ADJUST
MEASURE
READ ON
ON
with
frequency
check
counter
check
W&F-meter
or
1
2
left hand screw
max. output level
LEFT RIGHT
mV-meter
right hand screw
mV-meter
check
1
or
2
mV-meter
check
LEFT RIGHT
or
1
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
6dB
f(Hz)
100
250
4k
10k
figure. 2
to
3150Hz +/- 2%
< 0.4 % DIN
& left=right
125mV +/- 3dB
(see fig.1 for freq.
response)
limits see fig. 2 *
< 3% *
8dB
f(Hz)
8 - 3

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