Hitachi D-E99 Service Manual page 6

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)
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