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Recording
gain
Adjustment
1) Apply a 1kHz signal to the LINE IN
terminals,
record a 1kHz signal
at O dB input for both
L and
R
channels on a normal tape.
2) Play back the recorded
part, and
adjust the recording level controls
so that LINE
OUT
terminal
level
becomes
—8 dBs with peak level
indicator
reading
O. Then
adjust
VR104 and VR204 so that LINE
OUT
terminal
level becomes
—8
dBs.
Adjusting
For
Normal
R303
R301
R:R400
R402
"R403
R404
—8 + 2.5 dB
[
Standard
value
TD-W20A/B/C/E/G/.
Perform the adjustment using a nor-
mal tape. Level difference between
recording
and
playback
for VX/
CrO, and metal tapes should be less
than 1.5 dB, and that between left
and
right channels
should
also be
less than 1 dB.
L:R300 cut by +1.4dB
R302 cut by +0.5dB
R303 cut by —1.3dB
R301 cut by —2.5dB
R:R400 cut by +1.4dB
R402 cut by +0.5dB
R403 cut by —1.3dB
R401 cut by —2.5dB
Be sure to perform
this checking
following bias current and record-
ing level checking.
Checking
Record
a 1kHz,
—8dB
signal to
Normal tape:
record/
LINE
IN
terminals
and
perform
Less than 2%
playback
recording with the peak level indi-
CrO, tape:
distortion
cator reading 0.
Less than 3%
2) Play back the recorded part. Check
Metal tape:
the output with a distortion meter
Less than 2%
to see if the value conforms to the
(THD)
standard value.
Checking
1) Record
a 1 kHz, 0 dB signal. Stop
Normal, CrO2
signal to nosie
the input by disconnecting from the
& Metal tapes:
ratio in
terminal
to
perform
non-signal
More than
recording/
recording.
42 dB
playback
2) Play back the recorded part. Mea-
Checking
erasing
coefficient
sure the O dB recording output and
the non-signal recording output for
comparison using an electronic volt-
meter. Check to see if the value. con-
forms to the standard value.
Apply a 1 kHz signal to the LINE
IN terminals. Adjust the recording
level controls
until the peak level
indicator reads O dB.
2) Perform
recording with the signal
enhanced by 20 dB.
3) Erase a part of the recording.
4) Measure
the output difference be-
tween
the
erased
part
and
non-
erased
part
to
compare
with
an
electronic voltmeter.
More than
65 dB
HA12088
Apply
an input level to LINE
IN
terminals
with
the recording
level
controls
set to maximum
so that
the peak level indicator reads O dB.
For the measurement using a metal
tape, connect a band pass filter be-
tween
the deck and the electronic
voltmeter.
Tape deck
(recording,
Input
(1 kHz0
VU
+20 dB)
erasing)
Electronic
voltmeter
(1 kHz)
Band pass Filter
(No. 4256) 11
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