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Checking
record/
play back
distortion
play
back
the
recorded
part,
and check so that Line out ter-
minal level become O + 2.5 dB.
2. If the standard
value
cannot
be
obtained,
adjust
the
recording
level using R139, 140, 141 and
142
in combination
(for L-ch),
and R239,
240,
241
and 242
(R-ch), respectively.
. Record
a 1kHz,
—8dB
signal to
LINE
IN
terminals
and
perform
recording
with
the
multi-peak
becomes to 0.
2. Play back the recorded part. Check
the output
with a distortion meter
to see if the value conforms
to the
standard value.
NORM
than 3 dB. Perform the adjustment
using a normal tape, level difference
between recording and playback for
SA/CrO2
and
metal
tapes, should
be less than 3 dB, and that between
left and right channels
should also
be less than 3 dB.
tape; Less
Less than 3%
Metal tape;
Less than 2%
(THD)
following
bias current and record-
than 2.0%
ing level checking.
CrO2 tape;
Be sure
to perform
this checking
5 | Checking
signal to
noise ratio
playback
in recording/
2. Play back the recorded part.
1. Record a1 kHz, 0 dB signal.
Stop
the
input
by disconnecting
from
the terminal
to perform
non-
signal recording.
Measure the O dB recording output
and the non-signal recording output
for comparison
using an electronic
voltmeter.
Check to see if the value conforms
to the standard value.
NORM,
CrO2 and
Metal tapes;
||
More than
42 dB
Apply an output (—72 dBs) to the
MIC
terminals
with
the recording
evel controls
set to maximum
so
that the
multi-peak
indicator
be-
comes
0 dB.
Checking
erasing
coefficient
8 (No. 4243)
+
1. Apply a 1 kHz signal to the LINE
2. Perform
recording
with
the signal
3. Erase a part of the recording.
4. Measure
the
output
difference
be-
IN terminals. Adjust the recording
level controls
until the multi-peak
indicator becomes 0 dB.
enhanced by 20 cB.
tween
the
erased
part
and
non-
erased
part
to
compare
with
an
electronic voltmeter.
Ll
More than
65 dB
For the measuring, connect a band
pass filter between the deck and the
electronic voltmeter.
Tape deck
(recording,
erasing)
Input
i
(1 kHz OdB
+ 20 dB)
Electronic
voltmeter
Band pass
filter
(1kHz)
:
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