Sony CFD-V37 Service Manual ▷ View online
— 5 —
SECTION 3
DISASSEMBLY
Note :
Follow the disassembly procedure in the numerical order given.
Set
Front cabinet
Control (1) board
Control (2) board
Upper cabinet
Mechanism deck
Primary board
REC SW board
Main board
Power board
BATT board
Optical pick-up
Headphone board
•
The equipment can be removed using the following procedure.
3-1.
FRONT CABINET, CONTROL (1) BOARD, CONTROL (2) BOARD, HEADPHONE BOARD
1
Three screws
+BVTP 3
×
12
4
Two screws
+BVTP 3
×
12
2
STOP/EJECT
Handle
Upper cabinet
Tape operation button
Rear cabinet
6
5
7
3
3-2.
UPPER CABINET
Front cabinet
Rear cabinet
7
CONTROL (1) board
!¡
CONTROL (2)
board
6
Five screws +BVTP 2.6
×
8
!™
Screw +BVTP 2.6
×
8
8
Two screws
+BVTP 2.6
×
8
0
Seven screws
+BVTP 2.6
×
8
4
Four screws +BVTP 3
×
14
3
Four screws
+BVTP 3
×
14
9
Tuning knob
!£
Headphone board
2
1
5
— 6 —
3-3.
OPTICAL PICK-UP
3-4.
MECHANISM DECK, REC SW BOARD, MAIN BOARD, POWER BOARD, BATT BOARD,
PRIMARY BOARD
PRIMARY BOARD
1
Three screws +BVTP 3
×
10
2
Mechanism deck
4
REC SW board
!™
BATT board
7
MAIN board
!¢
PRIMARY board
Rear cabinet
3
Two screws +BVTP 3
×
10
6
Three screws +BVTP 3
×
10
9
Three screws +BVTP 3
×
10
!£
Three screws
+BVTP 3
×
10
5
CNP301 (4pin)
8
Chassis (PWB)
0
POWER board
!¡
3
Wire (Flat type) (16 core)
to MAIN board (CNP701)
2
CNP702 (6pin)
1
5
CD Motor
board
board
Optical pick-up section
4
Remove solder
— 7 —
SECTION 4
ADJUSTMENTS
Torque Meter
CQ-403A
Meter Reading
more than 80g
(more than 2.83 oz)
4-2.
ELECTRICAL ADJUSTMENT
Standard output level
Test tape
Tape Speed Adjustment
Procedure :
Mode : Playback
Mode : Playback
Adjustment Value : normal tape speed
Adjust the tape speed adjustment control inside motor, so that the
frequency counter reading becomes 3,000 Hz.
Adjust the tape speed adjustment control inside motor, so that the
frequency counter reading becomes 3,000 Hz.
Specification Value :
Frequency difference between the beginning and the end of the
tape should be within 3% (90 Hz).
tape should be within 3% (90 Hz).
Adjustment Location :
HP OUT
32
Ω
0.25 V (–10dB)
Output Pin
Load impedance
Output signal level
4-1.
MECHANICAL ADJUSTMENT
PRECAUTION
1.
Clean the following parts with a denatured-alchool-moistened
swab:
swab:
record/playback head
pinch roller
erase head
rubber belts
capstans
2.
Demagnetize the record/playback head with a head
demagnetizer. (Do not bring the head demagnetizer close to
the erase 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.
parts adjusted.
Torque Measurement
Tape Tension Measurement
Meter Reading
60g
•
cm
(0.42 – 0. 83 oz
•
inch)
1 – 5g
•
cm
(0.014 – 0.07 oz
•
inch)
more than 55g
•
cm
(more than 0.77 oz
•
inch)
more than 55g
•
cm
(more than 0.77 oz
•
inch)
Mode
FWD
FWD
back tension
Fast Forward
Rewind
Torque Meter
CQ-102C
CQ-201B
0dB = 0.775V
TAPE RECODER SECTION
Test Tape
WS-48A
P-4-A063
Used for
Tape speed adjustment
Head azimuth adjustment
Signal
3kHz, 0dB
6.3 kHz, –10 dB
Digital frequency counter
2,910 – 3,090Hz
32
Ω
test tape
WS-48A
(3kHz, 0dB)
WS-48A
(3kHz, 0dB)
set
digital frequency
counter
counter
J302 (phones)
+
–
Tape speed adjustment
control inside motor
control inside motor
— 8 —
4-3.
TUNER SECTION
•
Switch Location
VOLUME
: MAX
MEGA BASS : OFF
TONE
TONE
: OFF
BAND : AM
Signal generator
Signal generator
BAND : FM
Signal generator
Signal generator
Adjustment Location : MAIN board (Component side)
(See page 9)
0 dB = 1 µV
• Repeat the procedures in each adjustment several times for the
maximum level meter indication.
• The frequency coverage and tracking adjustments should be
finally done by the trimmer capacitors.
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T2
455kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
620kHz
CT1 (3/4)
1,400kHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
87.35MHz(86.5MHz)
CT1 (1/4)
107.8MHz(109.5MHz)
AM SECTION
FM SECTION
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
signal.
Output level : as low as possible
AM RF signal
generator
generator
0.01
µ
F
FM RF signal
generator
generator
telescopic
antenna
input
(ANT1)
antenna
input
(ANT1)
75kHz (100%) amplitude modulation
by 1kHz signal.
Output level : as low as possible
by 1kHz signal.
Output level : as low as possible
32
Ω
set
+
–
level meter
J302 (phones)
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
516kHz(520kHz)
CT1 (4/4)
1,630kHz(1,780kHz)
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
10.7MHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
87.35MHz(86.5MHz)
CT1 (2/4)
107.8MHz(109.5MHz)
( ) : E92 model
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