Sony CFS-1055 - Service Adjustment Procedures; Mechanical Adjustments and Cleaning; Tape Section Electrical Adjustments

SECTION 3
ADJUSTMENTS
3-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-
moistened swab :
record/playback head __ pinch roller
erase head rubber belts
capstan idlers
2. Demagnetize the record/playback head with a head
demagnetizer. (Do not bring the head demagnetizer
close to the erase head.)
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 performed with the rated
power supply voltage unless otherwise noted.
1. Torque Measurement
Torque Meter
Meter Reading
30 — 70gecm
Playback CQ-102C (0.42 — 0.97 ozeinch)
. 1.5-5.5gecm
CQ 102C (0.021- 0.076 ozeinch)
55 — 135gecm
(0.77— 1.87 ozeinch)
Rewind
| Fast Forward CQ018
2.Tape Tension Measurement
|_Mode | Tension Meter_| Meter Reading
CQ-403A more than 100g (3.53 02)
3-2. ELECTRICAL ADJUSTMENTS
TAPE SECTION
1. The adjustments should be performed in the order given in the
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit adjust-
ment.)
2. The adjustments should be performed for both L-CH and R-CH
unless otherwise indicated.
@ Switch location
FUNCTION ....ceccececesees TAPE (RADIO OFF)
GRAPHIC EQUALIZER .. center click
BALANCE. .--ccseeeseceveees center click
VOLUME. ..«-ecceeeeeceeeeeees mechanical center’
BASS BOOST ...-ceeeceeees mechanical center
0 dB=0.775V
Test Tape
3kHz, 0dB Tape Speed Adjustment
6.3kHz, — 10dB Azimuth Adjustment
P-4-L300 315Hz, OdB Level Adjustment