Mechanical Adjustments; Electrical Adjustments; Tape Section - Sony CFS-B7SMK2 Service Manual

SECTION 3
QQ

MECHANICAL ADJUSTMENTS

3 7 63 1515 0
PRECAUTION
1. Clean the following parts with a denatured alchool-moistened
swab:
record/playback head
erase head
capstan
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 perfomed with the rated power supply
voltage unless otherwise noted.
Torque Measurement
Mode Torque Meter
Forward
CQ-102C
Forward
CQ-102C
back tension
REV
CQ-102C
REV
CQ-102C
back Tension
Fast
CQ-201B
Forward
TE
L 13942296513
Rewind
CQ-201B
Tape Tension Measurement
Mode Torque Meter
Forward
CQ-403A
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pinch roller
rubber belts
idlers
Meter Reading
25 – 60 g•cm
(0.35 – 0.83 oz•inch)
1 – 5 g•cm
(0.014 – 0.069 oz•inch)
25 – 60 g•cm
(0.35 – 0.83 oz•inch)
1 – 5 g•cm
(0.014 – 0.069 oz•inch
55 – 140 g•cm
(0.76 – 1.94 oz•inch)
55 – 140 g•cm
(0.76 – 1.94 oz•inch)
Meter Reading
more than 170 g
(more than6.00 oz)
x ao
y
i
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SECTION 4

ELECTRICAL ADJUSTMENTS

8
4-1.

TAPE SECTION

Standard output level
Output terminal
Load impedance
Output signal level
Test tape
Test Tape Signal
WS-48B 3kHz, 0dB
P-4-A063 6.3 kHz, -10 dB
Tape Speed Adjustment
Procedure :
Mode : Playback
test tape
WS-48B
(3 kHz, 0 dB)
set
1. Playback the test tape in the FWD playback mode.
2. Confirm that the digital frequency counter reading indicates a
Q Q
value in the range of 2,940 to 3,060 Hz at tape top.
3 6 7 1 3
3. If the specification is not satisfied, adjust variable resistor of
motor (M901) until the frequency counter reading is as close to
3,000 Hz as possible at the FWD tape top.
Specification : 2,940 to 3,060 Hz
4. Frequency difference between the beginning and the end of the
tape should be within 1.5% (45Hz).
Adjustment Location :
TAPE
SPEED
ADJ.
(M901)
u163
.
2 9 9 4 2 8
0dB = 0.775V
HP OUT
32 Ω
0.25 V (–10 dB)
Used for
tape speed adjustment
head azimuth adjustment
digital frequency
counter
0000
32 Ω
phones jack
1 5 0 5 8 2 9 9 4
m
co
9 9
2 8 9 9