Sony CFD-G70 Service Manual ▷ View online
10
CFD-G70
3-8. BATT BOARD, BATT COM BOARD
3-9. MAIN BOARD
1
Screw
(+WH 3
×
8)
3
Claw
BATT COM board
BATT board
4
2
1
Screws
(+BVTP 3
×
10)
4
Flexible cable
(from Main board CNP802)
2
Flexible cable
(from Main board CNP801)
3
Connector
(from Main board CNP322)
1
Screw
(+BVTP 3
×
10)
Main board
5
11
CFD-G70
3-10. CD BOARD, TC BOARD, OPTICAL PICK-UP BLOCK, MECHANISM DECK
3-11. M321 (CAPSTAN/REEL MOTOR), BELT,
“HRP301 HEAD, MAGNETIC (RECORD/PLAYBACK)”
HE301 HEAD (ERASE)
HE301 HEAD (ERASE)
6
Screws
(+BVTP 3
×
10)
8
Screw (+PTT 2
×
6)
3
Screw (+P 2
×
6)
1
Screws
(+PWH 2.6
×
10)
1
Screws
(+PWH 2.6
×
10)
4
Flexible cable
(from CD board CNP701)
5
CD board
0
TC board
9
Unsolder lead wires
Mechanism deck
Optical pick up block
2
7
Mechanism deck
1
Screws
(+B 2.6
×
5)
5
HRP301
Head, magnetic (record/playback)
6
HE301
Head (erase)
4
M321
(Capstan/reel motor)
2
3
Belt
12
CFD-G70
3-12. OPTICAL PIC-UP (KSS-213C)
4
1
2
5
3
Bend the stopper
Chassis ASSY, motor (MB) (spindle)
Shaft, sled
Claws
Claw
Claw
Claw
Cover, CD
Gear
Optical pick-up (KSS-213C)
13
CFD-G70
4-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
2. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head demagnetizer close to the erase
head.)
head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the rated power sup-
4. The adjustments should be performed with the rated power sup-
ply voltage (12V) unless otherwise noted.
Torque Measurement
Torque
Torque Meter
Meter Reading
1.77 – 5.88 mN•m
Forward
CQ-102C
(18 – 60 g•cm)
(0.25 – 0.83 oz•inch)
Forward
0.1 – 0.49 mN•m
Back Tension
CQ-102C
(1.0 – 5.0 g•cm)
(0.014 – 0.069 oz•inch)
4.42 – 9.31 mN•m
Fast Forward
CQ-201B
(45 – 95 g•cm)
(0.62 – 1.32 oz•inch)
4.42 – 9.31 mN•m
Rewind
CQ-201B
(45 – 95 g•cm)
(0.62 – 1.32 oz•inch)
Tape Tension Measurement
Torque Meter
Meter Reading
CQ-403A
more than 60g
(more than 2.12 oz)
SECTION 4
ADJUSTMENTS
4-2. ELECTRICAL ADJUSTMENTS
TAPE RECORDER SECTION
Standard Output Level
Output terminal
HP OUT
load impedance
32
Ω
output signal level
0.25V (–10dB)
Test Tape
Type
Signal
Used for
WS-48A
3kHz, 0dB
Tape Speed Adjustment
Tape Speed Adjustment
Procedure :
Procedure :
Mode : Playback
Adjustment so than the value on the digital frequency counter is
3,000 Hz.
3,000 Hz.
Adjustment Value : 3,000Hz
Standard Value : 2,940 - 3,060Hz
Standard Value : 2,940 - 3,060Hz
Frequency difference between the beginning and the end of the tape
should be within 1.5% (45Hz).
should be within 1.5% (45Hz).
set
test tape
WS-48A
(3kHz, 0dB)
WS-48A
(3kHz, 0dB)
32
Ω
digital frequency
counter
counter
J391 (
i
jack)
Tape speed adjustment
control inside motor
control inside motor
0dB = 0.775V
Adjustment Location : Mechanism deck
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