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Head replacement and azimuth adjustment
' After replacing the head, demagnetize (clean) it with head
cleanings and head silencer. Play back the test tape for
azimuth adjustment (VTT-658, 10 kHz for instance), and
turn the azimuth adjusting screw with Phillips screwdriver
so that the left and right outputs of both SIDE 1 and SIDE
2 of cassette will be maximized.
Motor replacement and speed regulation
Play back the test tape (MTT-111, 3 kH for instance), and
turn the SVR located on the back of motor with blade
screwdriver so that the frequency counter will indicate
3,000 Hz.
Mechanism adjustment
*
Before measurement, clean the head, capstan and pinch
roller.
Check torque and tensions.
*
Measuring
Take-up
torque
Measurement
| PLAY:
PLAY/F.FWD:
Drive power
cassette
TW-2111
TW-2111
cassette
F.FWD/REW:
| REW:
TW-2412
TW-2231
towque gauge
PLAY
35~60 gr.cm
Greater than
180 gr.
F.FWD
90~130 gr.cm
Back tension
Tape tension
Belt replacement
1. Flat Belt, Flywheel
141-2-561T-05271
2. Square Belt, Idler
141-2-564T-23971
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