0-E99
1
2
3
4
5
6
7
8
9
IC401
Pin@
152473
or
152076
Fig. 2
5.
1)
Perform the
ATRS
test using Hitachi
UD(C-90)
tape.
2)
Set the monitor switch
to
the SOURCE position and
feed a 1 kHz signal
to
the LINE IN jacks
in
the
recording mode.
3)
Adjust
the audio oscillator
output
so
that
the digital
peak meter indicates
0 dB. Then, adjust the attenuator
to lower the
output
level
by
23
dB.
·4)
Read
the
output
of
LINE
OUT
jacks when the
monitor
switch
is changed over, and adjust RT302L,
R so
that
the
output
when the MONITOR switch
is
set
to
TAPE is within ±
0.3
dB with respect to the
output
when the monitor switch is set
to
SOURCE.
INSPECTION
OF
MECHANISM
Check Item Reference Value
Remarks
Pressure
roller
Pressure
420-500g
(Take-up side)
Measure
in
playback mode (Fig.
3)
Driving force
120g
or more
Pressure
of
pressure roller (Supply
130-180g
Measure
in
playback mode (Fig.
4)
side)
Pressure
of
take-up idler
60g
or more
Measure
in
playback mode (Fig.
5)
Take-up
35-65g·cm
Torque
Fast
forward
Measure
in
fast forward mode
75-110g·cm
Rewind
Measure
in
rewind mode
Supply side
(See )
Back tension
9-12g·cm
Note 1
Measure
in
playback mode (Fig.
6)
Take-up side
1.7-5g·cm
Supply side
Brake torque
50-100g·cm
Measure
in
stop mode
(Fig.
7)
Take-up side
Head
plate return strength
200g
or more
Measure
in
stop mode
(Fig.
8)
Head
plate play lock allowance
300g
or more
Measure
in
playback mode (Fig.
9)
Head plate pressing strength
150g
or more
Measure
in
playback mode (Fig.
10)
- 6 -
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