Sony CFS-1055 Service Manual ▷ View online
– 5 –
SECTION 2
DIAL POINTER INSTALLATION
Note : Follow the installation procedure in the numerical order given.
(Fig-2)
(Fig-1)
Knob (Tune)
Chassis
PVC shaft
Tuner board
3
Pointer
2
1
4
Knob (Tune)
5
Screw +P2.6x6
1
Turn the PVC shaft fully counterclockwise.
2
Place the pointer in the chassis groove.
3
Line up the tip of the pointer with the notch in the chassis.
(See Fig-1)
(See Fig-1)
4
Attach so that the knob (Tune) is at the position shown in
Fig-2.
Fig-2.
Notch
Pointer
Chassis
– 6 –
SECTION 3
ADJUSTMENTS
3-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-
moistened swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
idlers
2. Demagnetize the record/playback head with a head
demagnetizer. (Do not bring the head demagnetizer
close to the erase head.)
close to the erase head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound
4. After the adjustments, apply suitable locking compound
to the parts adjusted.
5. The adjustments should be performed with the rated
power supply voltage unless otherwise noted.
Mode
Torque Meter
Meter Reading
Playback
CQ-102C
30 – 70g•cm
(0.42 – 0.97 oz•inch)
Back Tension
CQ-102C
1.5 – 5.5g•cm
(0.021– 0.076 oz•inch)
Rewind
CQ-201B
55 – 135g•cm
Fast Forward
(0.77– 1.87 oz•inch)
1. Torque Measurement
2.Tape Tension Measurement
3-2. ELECTRICAL ADJUSTMENTS
TAPE SECTION
Mode
Tension Meter
Meter Reading
FWD
CQ-403A
more than 100g (3.53 oz)
1. The adjustments should be performed in the order given in the
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit adjust-
ment.)
should be completed before performing recording circuit adjust-
ment.)
2. The adjustments should be performed for both L-CH and R-CH
unless otherwise indicated.
r
Switch location
FUNCTION
FUNCTION
• • • • • • • • • • • • • • • • •
TAPE (RADIO OFF)
GRAPHIC EQUALIZER
• •
center click
BALANCE
• • • • • • • • • • • • • • • • • •
center click
VOLUME
• • • • • • • • • • • • • • • • • • • •
mechanical center
BASS BOOST
• • • • • • • • • • • • • •
mechanical center
0 dB=0.775V
Type
Signal
Used for
WS-48B
3kHz, 0dB
Tape Speed Adjustment
P-4-A063
6.3kHz, – 10dB
Azimuth Adjustment
P-4-L300
315Hz, 0dB
Level Adjustment
Test Tape
– 7 –
Record/Playback Head Azimuth Adjustment
Procedure :
1. Mode : playback
Procedure :
1. Mode : playback
VTVM
32
Ω
phones jack
set
test tape
P-4-A063
(6.3kHz, -10dB)
P-4-A063
(6.3kHz, -10dB)
L
R
Tape Speed Adjustment
Procedure :
Procedure :
Mode : playback
speed checker
LFM-30 or
digital frequency
counter
LFM-30 or
digital frequency
counter
32
Ω
set
test tape
WS-48B
(3kHz, 0dB)
WS-48B
(3kHz, 0dB)
phones jack
Adjustment Values :
Speed checker
Digital frequency counter
±
3%
2,910 to 3,090Hz
Adjustment Location :
2. Turn the adjustment screw for the maximum output levels. If these
levels do not match, turn the adjustment screw until both of output
levels match together within 3dB.
levels match together within 3dB.
L-CH
peak
peak
R-CH
peak
peak
screw position
within
3dB
3dB
within
3dB
3dB
L-CH
peak
peak
R-CH
peak
peak
screw
position
position
Phase Check
Mode : playback
Mode : playback
VTVM
32
Ω
L-CH
32
Ω
R-CH
set
L
+
–
–
+ R
Phones jack
in phase
45
°
90
°
135
°
180
°
wrong
good
3. After the adjustment, lock the screws with locking compound.
Adjustment Location :
adjustment screw
output
level
level
screen patten
tape speed adjustment
control inside motor
control inside motor
Frequency difference between the begining and the end of the
tape should be within 1 % (30Hz).
tape should be within 1 % (30Hz).
– 8 –
TUNER SECTION
r
Switch location
VOLUME
VOLUME
• • • • • • • • • • • • • • • • • • • • • • •
mechanical center
BALANCE
• • • • • • • • • • • • • • • • • • • • •
center click
BASS BOOST
• • • • • • • • • • • • • • • • •
center click
GRAPHIC EQUALIZER
• • • • •
center click
FM RF signal
generator
generator
22.5kHz frequency deviation by
400Hz signal.
Output level : as low as possible
400Hz signal.
Output level : as low as possible
telescopic
antenna
terminal
antenna
terminal
0.01
µ
F
VTVM
phones jack
32
Ω
set
+
–
r
Repeat the procedures in each adjustment several times,
and the frequency coverage and tracking adjustments should
be finally done by the trimmer capacitors.
and the frequency coverage and tracking adjustments should
be finally done by the trimmer capacitors.
AM IF ALIGNMENT
Adjust for a maximum reading on VTVM.
T1
455kHz
(455kHz)
<455kHz>
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on VTVM.
L3
600kHz
(600kHz)
<600kHz>
CT3
1,500kHz
(1,400kHz)
<1,400kHz>
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on VTVM.
L4
520kHz
(520kHz)
<516kHz>
CT4
1,780kHz
(1,680kHz)
<1,630kHz>
no mark : US, Canadian, E, Australian model
( )
: AEP model
< > : Italian model
AM Section
FUNCTION SW : FM
AM RF signal
generator
generator
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
Output level : as low as possible
FM Section
FUNCTION SW : FM
MONO/ST SW : STEREO (AEP, Italian model only)
MONO/ST SW : STEREO (AEP, Italian model only)
no mark : US, Canadian, E, Australian model
( )
: AEP model
< > : Italian model
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on VTVM.
L2
86.5MHz
(87.0MHz)
<87.35MHz>
CT2
109.5MHz
(108.3MHz)
<108.25MHz>
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on VTVM.
L1
86.5MHz
(87.0MHz)
<87.35MHz>
CT1
109.5MHz
(108.3MHz)
<108.25MHz>
1. Connect the frequency counter to 4 and 7 pins of IC1 as
shown the figure below.
2. Turn the set to 98MHz.
3. Adjust RV1 for 76 kHz
3. Adjust RV1 for 76 kHz
±
500 Hz reading on frequency counter.
FM RF signal
generator
generator
0.01
µ
F
Carrier frequency :
98MHz
Modulation :
no modulation
output level:
0.032V(90dB)
VCO Adjustment
procedure :
procedure :
Set
33k
Ω
1
µ
F
frequency
counter
counter
+
telescopic antenna
terminal
terminal
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