Mechanical Adjustments; Electrical Adjustments - Sony CFD-G555CP Service Manual

CFD-G555CP/G555CPK
SECTION 4
QQ

MECHANICAL ADJUSTMENTS

3 7 63 1515 0
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
demagnetizer. (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
TE
Tape Tension Measurement
L 13942296513
Mode Torque meter
FWD CQ-403A
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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)
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SECTION 5

ELECTRICAL ADJUSTMENTS

2 9
8
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
Adjust so that the value on the digital frequency counter is
3,000 Hz.
test tape
WS-48A
(3 kHz, 0 dB)
set
Specification Value:
Digital frequency counter
2,940 to 3,060 Hz
Q Q
3 6 7 1 3 1 5
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:
co
.
Tape speed adjustment
control inside motor
(M971)
9 4 2 8
HP OUT
32 Ω
0.25 V (–10 dB)
Used for
tape speed adjustment
digital frequency
counter
32 Ω
i jack (J391)
0 5 8 2 9 9 4 2 8
m
9 9
9 9