Sony M-101 - Electrical Adjustments; Tape Speed Adjustment

7 M-101/101B
3-2. ELECTRICAL ADJUSTMENTS
PRECAUTION
Clean the following parts with a
denatured-alcohol-
moistened swab:
Record/Playback head Pinch roller
Erase head
Rubber belts
Capstan Idlers
Demagnetize the record/playback head with a
head demagnetizer.
(Do not bring the head demagnetizer close to
the erase head, and do not use a magnetized screw-
driver for adjustments).
After the adjustments, apply the locking com-
pound to the adjusted parts.
The adjustments should be performed in the order
listed in this service manual.
1. Tape Speed Adjustment
Setting:
Power source:
2.5 V dc
Procedure:
1. Mode: playback
rest rape
WS-24
13 kHz, 0 dB)
speed checker (SONY L FM-30
or digital frequency counter
EARPHONE
1) Adjust R18 for 0 % on the speed checker or
3000 Hz on the digital frequency counter.
2) Following specifications should be satisfied with
the power source from 2 V dc to 3.5 V dc.
3) Specifications:
Speed checker Digital frequency counter
+3%
- 2.5 %
2925 Hz ~ 3090 Hz
Frequency difference between beginning and
end of tape should be within 1 % (30 Hz).
Adjustment Location:
R18
-6-