Sony CFT-22 Service Manual ▷ View online
– 5 –
2-3. DIAL, CHASSIS REMOVAL
2
3 Dial chassis
Claw
1 Rubber
ring
MD section
Lead wire
– 6 –
SECTION 3
DIAL POINTER INSTALLATION
Note : Follow the installation procedure in the numerical order given.
2 Pointer
Dial chassis
1 PVC drum
1 Turn the PVC drum fully counterclockwise.
2 Place the pointer in the dial chassis groove.
3 Line up the pointer with A in the dial chassis. (See Fig-1)
2 Place the pointer in the dial chassis groove.
3 Line up the pointer with A in the dial chassis. (See Fig-1)
A
A
Fig-1
Pointer
4 Attach the front cabinet in the direction of the arrow.
5 Attach the rear cabinet in the direction of the arrow.
6 Insert the tuning knob.
5 Attach the rear cabinet in the direction of the arrow.
6 Insert the tuning knob.
Rear cabinet
5
4
Front cabinet
6 Tuning knob
3 Dial chassis
– 7 –
4-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
playback head
pinch roller
rubber belts
capstan
2. Demagnetize the playback head with a head demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
3. Do not use a magnetized screwdriver for the adjustments.
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 (6V) unless otherwise noted.
Torque Measurement
Mode
Torque meter
Meter reading
FWD
CQ-102C
20-42 g • cm
(0.28-0.58 oz • inch)
FWD
less than 2 g • cm
Back Tension
(less than 0.03 oz • inch)
REV
CQ-102RC
20-42 g • cm
(0.28-0.58 oz • inch)
REV
less than 2 g • cm
Back Tension
(less than 0.03 oz • inch)
FF, REW
CQ-201B
more than 50 g • cm
(more than 0.69 oz • inch)
SECTION 4
ADJUSTMENTS
4-2. ELECTRICAL ADJUSTMENTS
TAPE PLAYER SECTION
r
Supplied voltage : 6V
Standard Output Level
Ouput terminal
EARPHONE
load impedance
32
Ω
output signal level
0.14V (–15dB)
r
Test tape
Type
Signal
Used for
WS-48A
3kHz, 0dB
Tape Speed Adjustment
Tape Speed Adjustment
Procedure :
Procedure :
Mode : Playback
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
earphone jack
1. Playback WS-48A (tape center portion) in reverse mode.
Adjust the RV401 so that the frequency counter reads
2,985Hz
2,985Hz
±
10Hz.
Adjustment Location :
RV401
adjustor (7-721-052-82)
– 8 –
TUNER SECTION
AM Section
BAND switch
: AM
Volume
: MIN
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 Section
BAND switch
: FM
Volume
: MIN
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
set
32
Ω
level meter
earphone jack
+
–
r
Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally done
by the trimmer capacitors.
by the trimmer capacitors.
no mark : AEP, E, UK model
( ) : Italian model
[ ] : Saudi Arabia model
( ) : Italian model
[ ] : Saudi Arabia model
AM IF ALIGNMENT
Adjust for a maximum reading on level meter.
T1
455kHz
(455kHz)
[455kHz]
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
520kHz
(516kHz)
[520kHz]
CT4
1,680kHz
(1,630kHz)
[1,680kHz]
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
620kHz
(620kHz)
[620kHz]
CT3
1,400kHz
(1,400kHz)
[1,400kHz]
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
87.0MHz
(87.35MHz)
[87.35MHz]
CT2
108.3MHz
(108.25MHz)
[107.8MHz]
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
87.0MHz
(87.35MHz)
[87.35MHz]
CT1
108.3MHz
(108.25MHz)
[107.8MHz]
Adjustment Location : Main board
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