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DT-156
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4. Adjustments Related to Recording
4.3
1)
4.1 Bias Frequency Adjustment
2)
1)
Setup..........
Connect
a frequency
counter
3)
to the
R501
(Lch) and R601
(Rch) circular terminals.
2)
Adjustment Point
. .
OSC Unit
3)
Adjustment
Procedure
.......
Adjust
so
that
the
bias fre-
quency
is 105 kHz + 0.3 kHz.
4.2 Recording Current Adjustment
1)
Test Tape
.......
AC512 (Special)
2)
Adjustment Point...
VR580
(Lch),
VR680
(Rch)
3)
Adjustment
Procedure
.......
Adjust so that the level when a
400
Hz
signal
is record
and
play back after putting the unit
on
rated
record and dropping
the
input
level
30 dB
is the
same as the monitor level.
ADJUSTMENT
POINTS
TAPE
SPEED
TAPE SPEED
(NORM.) TAPE{
(NORM,) TAPE2
veeze(S) Chvrea
TAPE
SPEED
(HIGH) TAPE1
242
Bias Current Adjustment
Test Tape
.......
Adjustment Point . .
Adjustment
Procedure
.......
OUTPUT
INPUT
AC512 (Special)
VR502
(Lch),
VR6O2
(Rch)
Lower
the
input
level
25 dB
after
setting
the
unit to the
rated
recording
values. Adjust
so
that
the
level
difference
when
a 1 kHz signal is record
and
play back and a 6.3 kHz
signal is record and play back
is within +9-° aB.
PB OUTPUT
LEVEL
(TAPE 1)
BIAS
FREQUENCY
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