Sony CFD-V25 / CFD-V35 Service Manual ▷ View online
— 9 —
SECTION 3
DISASSEMBLY
Note :
Follow the disassembly procedure in the numerical order given.
SET
FRONT CABINET
CONTROL (1) BOARD
TUNING KNOB
UPPER CABINET
MECHANISM DECK
PRIMARY BOARD
REC SW BOARD
MAIN BOARD
POWER BOARD
BATT BOARD
OPTICAL PICK-UP SECTION
CONTROL (2) BOARD
HEADPHONES BOARD
•
The equipment can be removed using the following procedure.
3-1.
FRONT CABINET, CONTROL (1) BOARD, CONTROL (2) BOARD, HEADSPHONES BOARD
1
Screws
+BVTP 3
×
12
4
Screws
+BVTP 3
×
12
2
STOP/EJECT
Handle
Cabinet (upper) assy
Tape operation button
Rear cabinet
6
5
7
3
3-2.
UPPER CABINET
Front cabinet
Rear cabinet
6
CONTROL (1) board
!º
CONTROL (2)
board
5
Screws +BVTP 2.6
×
8
!¡
Screw +BVTP 2.6
×
8
7
Screws
+BVTP 2.6
×
8
9
Screws
+BVTP 2.6
×
8
3
Screws +BVTP 3
×
14
3
Screws
+BVTP 3
×
14
8
TUNING KNOB
!™
Headphones board
2
1
4
— 10 —
3-3.
OPTICAL PICK-UP
3-4.
MECHANISM DECK, REC SW BOARD, MAIN BOARD, POWER BOARD, PRIMARY BOARD,
BATT BOARD
BATT BOARD
1
Screws +BVTP 3
×
10
Mechanism deck
REC SW board
BATT board
MAIN board
PRIMARY board
Rear cabinet
3
Screws +BVTP 3
×
10
6
Screws +BVTP 3
×
10
8
Screws +BVTP 3
×
10
!™
Screws
+BVTP 3
×
10
5
CNP301 (4pin)
7
9
POWER board
2
4
!£
!¡
!º
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
— 11 —
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
Frequency difference between the beginning and the end of the
tape should be within 2% (60Hz).
tape should be within 2% (60Hz).
Adjustment Location :
HP OUT
32
Ω
0.25 V (–10dB)
Output Pin
Load impedance
Output signal level
Test Tape
WS-48A
P-4-A063
Used for
Tape speed adjustment
Head azimuth adjustment.
Signal
3kHz, 0dB
6.3kHz, –10dB
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
1dB = 0.775V
Digital frequency counter
2,940 – 3,060Hz
Speed checker
–2.0 to 2.0%
TAPE RECODER SECTION
32
Ω
test tape
WS-48A
(3kHz, 0dB)
WS-48A
(3kHz, 0dB)
set
speed checker
LFM-30 or
digital frequency
counter
LFM-30 or
digital frequency
counter
J302 (phones)
+
–
Tape speed adjustment
control inside motor
control inside motor
— 12 —
4-3.
TUNER SECTION
•
Switch Location
VOLUME
: MAX
MEGA BASS
: OFF
PRESET SOUND MODE : OFF
BAND : AM
Signal generator
Signal generator
BAND : FM
Signal generator
Signal generator
Adjustment Location : MAIN board (Component side)
(See page 13)
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 ALIGNMENT
Adjust for a maximum reading on level meter.
T2
455kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
620kHz
CV1 (3/4)
1,400kHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
86.5MHz
CV1 (1/4)
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
terminal
antenna
terminal
75kHz (100%) amplitude modulation
by 1kHz signal.
Output level : as low as possible
by 1kHz signal.
Output level : as low as possible
32k
Ω
set
+
–
level meter
J302 (phones)
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
520kHz
CV1 (4/4)
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
86.5MHz
CV1 (2/4)
109.5MHz
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