DOWNLOAD Sony CFS-B15 (serv.man2) Service Manual ↓ Size: 2.61 MB | Pages: 17 in PDF or view online for FREE

Model
CFS-B15 (serv.man2)
Pages
17
Size
2.61 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cfs-b15-sm2.pdf
Date
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— 5 —
SECTION 3
MECHANICAL ADJUSTMENTS
SECTION 4
ELECTRICAL ADJUSTMENTS
PRECAUTION
1.
Clean the  following parts with a denatured-alcohol moistened
swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
idlers
2.
Demagnetize the record/playback head with a head
demagnetizer. (Do not bring the head demagnetizer close to
the erase head.)
3.
Do not use a magnetizer screwdriver for the adjustments.
4.
After the adjustments, apply suitable locking compound to
the parts adjusted.
5.
The adjustment should be perfomed with the reted power
supply voltage unless otherwise noted.
6.
Power supply voltage: 6V dc.
Torque Measurement
Tape Tension Measurement
Torque meter
CQ-403A
Meter reading
more than 100g
(more than 3.53 oz)
Torque
Forward
Forward
back tension
Fast
Forward
Rewind
Torque meter
CQ-102C
CQ-102C
CQ-201B
CQ-201B
Meter reading
30-70g•cm
(0.42-0.97 oz•inch)
1.5-5.5g•cm
(0.020-0.076 oz•inch)
more than 60g•cm
(more than 0.83 oz•inch)
more than 60g•cm
(more than 0.83 oz•inch)
4-1
TAPE RECODER SECTION
Standard Output Level
Test Tape
Tape Speed Adjustment
Procedure :
Mode : playback
Adjustment Value :
Frequency difference between the beginning and the end of the tape
should be within 1.5% (45Hz).
Adjustment Location :
Type
WS-48A
P-4-A063J
Used for
tape speed adjustment
head azimuth adjustment
Signal
3kHz, 0dB
6.3kHz, –10dB
Speed checker
–1% to +1%
Digital frequency counter
2,970–3,030Hz
output terminal
load impedance
output signal level
HP OUT
32
Ω
0.25V (–10dB)
SP OUT
12
Ω
0dB
tape speed adjustment
control inside motor
— 6 —
4-2.
RADIO SECTION
¡
FM Section
Setting :
FUNCTION switch : FM
¡
AM Section
Setting :
FUNCTION switch : AM
¡ Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
¡ Remove terescopic antenna in FM section adjustments.
FM FREQUENCY COVERAGE
ADJUSTMENT
Adjust for a maximum reading on VTVM.
L2
86.5MHz
CT1-3
109.5MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on VTVM.
L1/L3
86.5MHz
CT1-2
109.5MHz
AM FREQUENCY COVERAGE
ADJUSTMENT
Adjust for a maximum reading on VTVM.
T1
520kHz
CT1-4
1,780kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on VTVM.
ANT2
600kHz
CT1-1
1,400kHz
AM IF ADJUSTMENT
Adjust for a maximum reading on VTVM.
T2
455kHz
FM IF ADJUSTMENT
Adjust for a maximum reading on VTVM.
T3
*
* : The FM IF adjustment specifications are different depending
upon the color code of CF1.  See the following table.
CF1 color
Red
Blue
Orange
Black
White
frequency
10.70MHz
10.67MHz
10.73MHz
10.64MHz
10.76MHz
color code
CF1
SECTION 5
DIAGRAMS
5-1.
PRINTED WIRING BOARD – TUNER SECTION –
Note:
•
:parts extracted from the component side.
•
:indicates side identified with part number.
Adjustment Location : TUNER BOARD (COMPONENT SIDE)
VCO Adjustment
Procedure :
1.
Connect frequency counter as shown below.
2.
Tune the set to 98MHz.
3.
Adjust RV1 for 76kHz
±50Hz reading on the frequency counter.
ANT2
AM TRACKING
ADJ
T1
AM FREQUENCY
COVERAGE
ADJ
CV1
CT1-4
CT1-1
CT1-2
CT1-3
L1/L3
FM TRACKING
ADJ
L2
FM FREQUENCY
COVERAGE ADJ
T2
AM IF ADJ
IC1
T3
FM IF ADJ
RV1
VCO ADJ
CT1-2
FM TRACKING
ADJ
CT1-3
FM FREQUENCY
COVERAGE
ADJ
CT1-1
AM TRACKING ADJ
CT1-4
AM FREQUENCY
COVERAGE
 ADJ
Adjustment Location :
[TUNER BOARD] (conductor side)
– 7 –
– 8 –
CFS-B15
5-2.
SCHEMATIC DIAGRAM – TUNER SECTION –
– 9 –
– 10 –
• IC Block Diaguram
IC1 CXA1538S
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