Mechanical Adjustments; Electrical Adjustments Tape Section - Sony CFD-S550 Service Manual

CFD-S550
SECTION 4

MECHANICAL ADJUSTMENTS

PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head
erase head
capstan
2. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head magnetizer close to the erase head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the rated power
supply voltage (9V) unless otherwise noted.
Torque Measurement
Mode Torque meter
FWD CQ-102C
FWD
CQ-102C
Back Tension
FF CQ-201B
REW CQ-201B
Tape Tension Measurement
Mode Tension meter
FWD CQ-403A
14
pinch roller
rubber belts
idlers
Meter reading
2.95 – 6.86 mN • m
(30 – 70 g • cm)
(0.42 – 0.97 oz • inch)
0.15 – 0.53 mN • m
(1.5 – 5.5 g • cm)
(0.021 – 0.076 oz • inch)
more than 5.88 mN • m
(more than 60 g • cm)
(more than 0.83 oz • inch)
more than 5.88 mN • m
(more than 60 g • cm)
(more than 0.83 oz • inch)
Meter Reading
more than 100 g
(more than 3.53 oz)
SECTION 5
ELECTRICAL ADJUSTMENTS
TAPE SECTION 0 dB = 0.775 V
• Standard Output Level
Output terminal
load impedance
output signal level
• Test Tape
Type Signal
WS-48A 3 kHz, 0 dB
Tape Speed Adjustment
Procedure:
Mode: playback
test tape
WS-48A
(3 kHz, 0 dB)
set
Adjust so that the value on the digital frequency counter is
3,000 Hz.
Specification Value:
Digital frequency counter
2,940 to 3,060 Hz
Adjust so that the frequency at the beginning and that at the end of
tape winding are between 2,970 to 3,030 Hz.
Adjustment Location:
Tape speed adjustment
control inside motor
HP OUT
32 Ω
0.25 V (–10 dB)
Used for
tape speed adjustment
digital frequency
counter
32 Ω
i jack (J321)