Sony CFD-S27 Service Manual ▷ View online
– 5 –
SECTION 3
DISASSEMBLY
Note :
Follow the disassembly procedure in the numerical order given.
r
The equipment can be removed using the following procedure.
3-1. FRONT CABINET, SW BOARD REMOVAL
3-2. BATT BOARD, TUNER BOARD, AC INLET BOARD, POWER BOARD REMOVAL
Upper cabinet
Optical pick-up section
Front cabinet
Mechanism deck
Set
SW board
Main board, CD motor board
REC SW board
BATT board, Tuner board, AC Inlet board, Power board
5
Screws +BVTP (2.6X8)
Front cabinet
SW board
4
1
2
3
Screws +BVTP (3X14)
3
Screws
+BVTP (3X14)
Rear cabinet
6
BATT board
Power board
AC INLET board
1
2
8
7
Screws
+BVTP (3X10)
5
Screw +BVTP (3X10)
Rear cabinet
Tuner board
6
3
Tuner retainer board
4
Screw
+BVTP (3X10)
– 6 –
3-3. UPPER CABINET REMOVAL
3-4. OPTICAL PICK-UP SECTION, MECHANISM DECK, MAIN BOARD,
CD MOTOR BOARD, REC SW BOARD REMOVAL
CD MOTOR BOARD, REC SW BOARD REMOVAL
Rear cabinet
6
7
3
5
2
STOP/EJECT
4
Screws
+BVTP (3X10)
1
Screws
+BVTP (3X10)
Handle
Tape operation buttons
Upper cabinet
2
CNP707 (6pin)
Rear cabinet
Main board
REC SW board
3
Wire (Flat type) (16 core)
to MAIN board (CN701)
5
Screws +BVTP (3X10)
7
Screws +BVTP (3X10)
6
1
4
Optical pick-up
section
Mechanism deck
9
CD motor board
8
Remove solder
– 7 –
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
0dB = 0.775V
Tape Speed Adjustment
Procedure :
Mode : Playback
Adjustment Value :
Speed checker
Digital frequency counter
–1 to +1%
2,970 – 3,030Hz
Frequency difference between the beginning and the end of the tape
should be within 1.5% (45Hz).
should be within 1.5% (45Hz).
Adjustment Location :
SECTION 4
ADJUSTMENTS
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. After the adjustments, apply suitable locking compound to the
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power sup-
ply voltage unless otherwise noted.
Torque Measurement
Torque
Torque Meter
Meter Reading
Forward
CQ-102C
30 – 70 g•cm
(0.42 – 0.97 oz•inch)
Forward
CQ-102C
1.5 – 5.5 g•cm
Back Tension
(0.020 – 0.076 oz•inch)
Fast Forward
CQ-201B
more than 60 g•cm
(more than 0.84 oz•inch)
Rewind
CQ-201B
more than 60 g•cm
(more than 0.84 oz•inch)
Tape Tension Measurement
Torque Meter
Meter Reading
CQ-403A
more than 100g
(more than 3.53 oz)
set
test tape
WS-48A
(3kHz, 0dB)
WS-48A
(3kHz, 0dB)
32
Ω
speed checker
LFM-30 or
digital frequency
counter
LFM-30 or
digital frequency
counter
J301 (phones)
Tape speed adjustment
control inside motor
control inside motor
– 8 –
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
AM IF ALIGNMENT
Adjust for a maximum reading on level meter.
CFT1
450kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust part
Frequency display
reading on digital
voltmeter
Confirmation
531kHz
1.0 ± 0.2V
L4
1,611kHz
5.1 ± 0.2V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
621kHz
CT2
1,404kHz
FM IF ALIGNMENT
Adjust for a maximum reading on level meter.
T1
10.7MHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust part
Frequency display
reading on digital
voltmeter
Confirmation
87.5MHz
1.3 ± 0.2V
L2
108MHz
3.5 ± 0.2V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
87.5MHz
CT1
108MHz
TUNER SECTION
AM Section
Function switch : AM
Volume
Volume
: MIN
FM Section
Function switch : FM
Volume
Volume
: MIN
Frequency Coverage Adjustment
Setting :
[TUNER BOARD]
Adjustment Location :
Tuner board (See page 12)
AM RF signal
generator
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
signal.
Output level : as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
FM RF signal
generator
generator
22.5kHz frequency deviation by 400Hz signal.
Output level : as low as possible
Output level : as low as possible
telescopic
antenna
terminal
antenna
terminal
0.01
µ
F
set
32
Ω
J301 (phones)
level meter
C44
IC3
Digital voltmeter
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