Section 2 Mechanical Adjustments; Section 3 Electrical Adjustments; Tape Recorder Section - Sony CFS-204 Service Manual

SECTION 2
MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-
moistened swab: | |
record/playback head
erase head
pinch roller
rubber belts
capstan | idlers _ 3
2. Demagnetize the record/playback head with a head
demagnetizer. (Do not bring the head demagnetizer close
to the erase head.) oe
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound
to the parts adjusted. | | | | |
5. The adjustments should be perfomed with the rated
power supply voltage unless otherwise noted.
6. Power supply voltage: 9V dc. _
Torque Measurement
— -20~60g*em
Forward 2—-6g*cm
ae _(0.028—0.083 0z+inch)
Fast more than 45g*-cm
ante (more than 0.62 oz*inch).
—
CQ2018
rein giana
(more than 0.62 oz+inch)
Tape Tension Measurement
ne
more than 70g
{more than 2.47 oz)
CFS-204
SECTION 3
ELECTRICAL ADJUSTMENTS
3-1. TAPE RECORDER SECTION —
Standard Output Level
Output terminal SP OUT HP OUT
oT (dB) | 0250 (1086)
Test Tape
ee
Tape Speed Adjustment
Procedure :
speed checker |
Mode: playback LFEM-30
or eee
test tape _ » digital frequency
WS-48A counter _
(3kHz,0dB)
ne
headphones jack
F
Adjustment Value:
Speed checker Digital frequency cou nter.
Frequency difference between the beginning and the end of
the tape should be within 1% (30Hz).
Adjustment Location :
tape speed adjustment
contro! inside motor