Sony CFM-A50 Service Manual ▷ View online
– 5 –
2-3. MAIN BOARD, TUN LED BOARD, TACT SW BOARD REMOVAL
5
2
4
4
3
7
6
1
Screws (+BV 3x10)
Cabinet (Front) assy
Main board
Chassis, TU
TACT SW board
TUN LED board
2-4. H/P JACK BOARD, DOOR EAR (PH), BOX EAR (PH) REMOVAL
5
1
1
2
3
H/P JACK board
4
Screw (+BV 3x10)
4
Screw (+BV 3x10)
6
Screw
(+BV 3x10)
Box, ear(PH)
DOOR, ear(PH)
Cabinet (Front) assy
– 6 –
2-5. MECHANISM DECK, DECK CONTROL BOARD, VOLUME BOARD REMOVAL
1
6
9
4
2
DECK CONTROL board
Volume board
8
Screws (+BV 3x10)
5
Screws (+BV 3x10)
3
Screw +BV (3x10)
3
Screws (+BV 3x10)
7
Knob (TONE SW)
7
Knob (VOL)
Cabinet (Front) assy
Mechanism deck
– 7 –
SECTION 3
DIAL POINTER SETTING
Note :
Follow the instaooation procedure in the numerical order given.
1
Attach TU worm to tuner chassis.
2
Attach needle, tighten needle spring using a bolt, then attach TU
LED board.
LED board.
3
Rotate TU worm until needle stops at the stopper shown in Fig. A.
4
Mount PLATE BLIND and position it as shown in Fig. B.
5
Attach the band knob. Make sure that the projected part of the
tuner chassis fits as shown in Fig. C (the arrow).
tuner chassis fits as shown in Fig. C (the arrow).
6
Tighten idler gear, combine projected part of band knob and the
band slider so that they interlock, then mount to main board.
band slider so that they interlock, then mount to main board.
7
Mount VR gear to main board, then turn in the direction of the
arrow until it stops.
arrow until it stops.
8
Fasten the TU gear to the TU chassis with the screw.
3
Screw (+P 2.6x5)
Retainer, Pointer
Fig. A
Fig. B
Fig. C
1
Worm, TU
5
Knob, band
4
Plate, blind
2
Pointer
Chassis, TU
TUN LED board
Stopper
Screw (+BV 3x10)
Screws (+BV 3x10)
Screw (+BV 3x10)
Screw (+B 2.6x5)
7
Gear, VR
6
Gear, idler
8
Gear, TU
Main board
Slieder, band
Chassis, TU
– 8 –
SECTION 4
ADJUSTMENTS
4-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts wit2h 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
20 – 55 g•cm
(0.28 – 0.76 oz•inch)
Forward
CQ-102C
2 – 5 g•cm
Back Tension
(0.028 – 0.069 oz•inch)
Fast Forward
CQ-201B
more than 50 g•cm
(more than 0.7 oz•inch)
Rewind
CQ-201B
more than 50 g•cm
(more than 0.7 oz•inch)
Tape Tension Measurement
Torque Meter
Meter Reading
CQ-403A
more than 70g
(more than 2.47 oz)
4-2. ELECTRICAL ADJUSTMENTS
TAPE RECORDER SECTION
FUNCTION switch
: TAPE (RADIO OFF)
SLOW PLAYBACK switch
: OFF
EASY LISTENING ADJUSTMENT switch : OFF
VOLUME
VOLUME
: MIN
Standard Output Level
Output terminal
Earphone
Speaker
load impedance
32
Ω
3.2
Ω
output signal level
0.25V (–10dB)
0.775V (0dB)
Test Tape
Type
Signal
Used for
WS-48A
3kHz, 0dB
Tape Speed Adjustment
0dB=0.775V
Record/Playback Head Azimuth Adjustment
Procedure :
1. Playback Mode
1. Playback Mode
2. Rotate the screw to adjust level meter reading to the maximum.
Note :
Adjust to the maximum peak though there may be two or
three peakes
three peakes
3. After the adjustment, lock the adjustment screws with suitable
locking compound.
Adjustment Location :
set
test tape
P-4-A100
(10kHz, -10dB)
P-4-A100
(10kHz, -10dB)
32
Ω
level meter
J101 (Earphone jack)
adjustment screw
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