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Model
CFD-G70L
Pages
52
Size
4.72 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cfd-g70l.pdf
Date

Sony CFD-G70L Service Manual ▷ View online

11
CFD-G70L
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)
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-G70L
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-G70L
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.)
3. Do not use a magnetized screwdriver for the adjustments.
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 
output signal level
0.25V (–10dB)
Test Tape
Type
Signal
Used for
WS-48A
3kHz, 0dB
Tape Speed Adjustment
Tape Speed Adjustment
Procedure :
Mode : Playback
Adjustment so than the value on the digital frequency counter is
3,000 Hz.
Adjustment Value : 3,000Hz
Standard Value : 2,940 - 3,060Hz
Frequency difference between the beginning and the end of the tape
should be within 1.5% (45Hz).
set
test tape
WS-48A
(3kHz, 0dB)
32
digital frequency
counter
J391 ( 
i
 jack)
Tape speed adjustment 
control inside motor
 0dB = 0.775V
Adjustment Location : Mechanism deck
14
CFD-G70L
MW IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
450 kHz
(     ): AR
MW FREQUENCY COVERAGE CHECK
Frequency Display
531 kHz
1,611 kHz
(530 kHz)
(1,610 kHz)
Reading on Digital voltmeter
0.9 
± 0.4 V
5.2 
± 0.5V
Adjustment Part
<confirmation>
<confirmation>
(     ): AR
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
CT3
621kHz (620 kHz)
1,404 kHz (1,400kHz)
LW FREQUENCY COVERAGE CHECK
Frequency Display
153 kHz
279 kHz
Reading on Digital voltmeter
0.6 
± 0.2 V
5.0 
± 0.2V
Adjustment Part
< L 4 >
<confirmation>
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
CT5
162 kHz
261 kHz
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T2
10.7 MHz
FM FREQUENCY COVERAGE ADJUSTMENT
Frequency Display
87.5 MHz
108 MHz
Reading on Digital voltmeter
1.3 
± 0.4 V
3.0 
± 0.3 V
Adjustment Part
<confirmation>
L2
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT1
87.5 MHz
108 MHz
Adjustment Location : Main board (See page 16)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
 TUNER  SECTION
 MW/LW Section
Function switch : MW/LW
Volume
: MIN
 FM Section
Function switch : FM
Volume
: MIN
• Connecting Level Meter (FM/MW/LW)
• Connecting Digital Voltmeter (FM/MW/LW)
AM  RF signal
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
Put the lead-wire
antenna close to 
the set.
FM RF signal
generator
33.75kHz frequency deviation by 
1kHz signal.
Output level : as low as possible
telescopic
antenna
terminal
0.01
µF
 0dB = 1 
µV
J391 ( i jack)
set
32 
level meter
(range: 0.5–5 V ac)
digital
voltmeter
100 k
TP (VT)
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