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ELECTRICAL ADJUSTMENTS (continuea)
PLAYBACK OUTPUT LEVEL ADJUSTMENT
LEFT CHANNEL
. Connect
a
VTVM
to
the
left
channel
LINE
OUT
as
illustrated.
Then,
insert
test
tape for the DOLBY
Level
Calibration
(Example:
TEAC
MTT-150)
into the cassette
compartment.
VTVM 560mV
47 k-ohm
Dummy Load
. While playing back the test tape, adjust the potentiometer
(P101)
until
the
output
level
becomes
560mV
on
the
VTVM.
RIGHT CHANNEL
Connect
a VTVM
to the right channel
LINE
OUT.
Then,
adjust the potentiometer
(P201) for the right channel
by
following the same procedure as for the left channel.
METER LEVEL ADJUSTMENT
LEFT CHANNEL
Connect an audio signal generator and an attenuator to the
left channel LINE IN, anda VTVM to the left channel LINE
OUT
as illustrated. Then, insert a bulk-erased tape into the
cassette compartment and set the unit in the recording mode.
:
;
LINE
IN
Audio Signal
RECORO
Generator
R
1
Attenuator
:
315mV
(—10dB)
LINE
OUT
PLAY
BACK
Dummy Load
While
feeding
the
1kHz
signal
from
the
audio
signal
generator
at 315mV
(—10dB) to the unit, adjust the left
channel INPUT Level Control until the VTVM reads 560mvV.
Keeping the unit in the condition, adjust the potentiometer
(P103) until the pointer of the left channel Meter swings to
the DOLBY mark position as illustrated.
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100
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INPUT
LEVE
OUTPUT
LEVEL
RIGHT CHANNEL
Connect an audio signal generator and an attenuator to the
right channel
LINE
IN, and a VTVM
to the right channel
LINE
OUT.
Then,
adjust
the right channel
INPUT
Level
Control and the potentiometer (P203) for the right channel
by following the same procedure as for the left channel.
RECORD
& PLAYBACK
FREQUENCY
RESPONSE
ADJUSTMENT
1.
for Chromium Dioxide Tape
LEFT CHANNEL
Connect an audio signal generator and an attenuator to the
left channel
LINE
IN, and a VTVM
to the left channel
LINE OUT as illustrated. Then, insert a chromium
dioxide
tape (Example: TDK AC-221)
into the cassette compartment.
Generator
R
L
1kHz, 12.5kHz
Attenuator
5mV (—46 dB)
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