Sony CFD-V27 Service Manual ▷ View online
— 9 —
SECTION 4
DIAL POINTER INSTALLATION
Note :
Follow the installation procedure in the numerical order given.
1 Align the pointer with the groove of front cabinet and insert it as shown in the illustration.
2 Align Tuning knob with front cabinet and fasten the screw.
2 Align Tuning knob with front cabinet and fasten the screw.
3 Turn the Tuning knob in the direction of the arrow as shown in the illustration until pointer agrees with scale “ 0 ” (at leftmost end of
scale).
4 Turn the tuning capacitor gear fully in the direction of the arrow as shown in the illustration.
5 Fasten the front cabinet and rear cabinet with the screws.
5 Fasten the front cabinet and rear cabinet with the screws.
1
Pointer
Tuning knob B
Front Cabinet
2
Screw (2.6
×
8)
3
Tuning knob
4
Tuning capacitor gear
5
Rear cabinet
— 10 —
SECTION 5
ADJUSTMENTS
Torque Meter
CQ-403A
Meter Reading
more than 60 g
(more than 2.12 oz)
5-2.
ELECTRICAL ADJUSTMENT
Standard output level
Test tape
Tape Speed Adjustment
Procedure :
Mode : Playback
Mode : Playback
Adjustment Value : normal tape speed
Adjust the tape speed adjustment control inside motor, so that the
frequency counter reading becomes 3,000 Hz.
Adjust the tape speed adjustment control inside motor, so that the
frequency counter reading becomes 3,000 Hz.
Specification Value :
Frequency difference between the beginning and the end of the
tape should be within 1.5% (45 Hz).
tape should be within 1.5% (45 Hz).
Adjustment Location :
HP OUT
32
Ω
0.25 V (–10 dB)
Output
Load impedance
Output signal level
Test Tape
WS-48A
P-4-A063
Used for
Tape speed adjustment
Head azimuth adjustment.
Signal
3 kHz, 0 dB
6.3 kHz, –10 dB
5-1.
MECHANICAL ADJUSTMENT
PRECAUTION
1.
Clean the following parts with a denatured-alchool-moistened
swab:
swab:
record/playback head
pinch roller
erase head
rubber belts
capstans
2.
Demagnetize the record/playback head with a head
demagnetizer. (Do not bring the head demagnetizer close to
the erase head.)
demagnetizer. (Do not bring the head demagnetizer close to
the erase head.)
3.
Do not use a magnetized screwdriver for the adjustments.
4.
After the adjustments, apply suitable locking compound to the
parts adjusted.
parts adjusted.
Torque Measurement
Tape Tension Measurement
Meter Reading
18 – 60 g
•
cm
(0.25 – 0.83 oz
•
inch)
1.0 – 5.0 g
•
cm
(0.014 – 0.069 oz
•
inch)
45 – 95 g
•
cm
(0.62 – 1.32 oz
•
inch)
45 – 95 g
•
cm
(0.62 – 1.32 oz
•
inch)
Mode
FWD
FWD
back tension
Fast Forward
Rewind
Torque Meter
CQ-102C
CQ-201B
0dB = 0.775V
TAPE RECODER SECTION
Tape speed adjustment
control inside motor
control inside motor
32
Ω
test tape
WS-48A
(3kHz, 0dB)
WS-48A
(3kHz, 0dB)
set
digital frequency
counter
counter
J301 (phones)
+
–
Digital frequency counter
2,910 – 3,090Hz
— 11 —
5-3.
TUNER SECTION
•
Switch Location
VOLUME
: MAX
MEGA BASS
: OFF
PRESET SOUND MODE : OFF
BAND : AM
Signal generator
Signal generator
BAND : FM
Signal generator
Signal generator
0 dB = 1 µV
• Repeat the procedures in each adjustment several times for the
maximum level meter indication.
• The frequency coverage and tracking adjustments should be
finally done by the trimmer capacitors.
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T2
455 kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
620 kHz
CT3
1,400 kHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
86.5 MHz
CT1
109.5 MHz
AM SECTION
FM SECTION
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
520 kHz
CT4
1,780 kHz
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
10.7 MHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
86.5 MHz
CT2
109.5 MHz
Adjustment Location : Main board (See page 13)
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
signal.
Output level : as low as possible
AM RF signal
generator
generator
0.01
µ
F
FM RF signal
generator
generator
FM ANT IN
terminal
terminal
75kHz (100%) amplitude modulation
by 1kHz signal.
Output level : as low as possible
by 1kHz signal.
Output level : as low as possible
32
Ω
set
+
–
level meter
J301 (phones)
— 12 —
FM VCO Adjustment
Procedure :
1. Connect frequency counter to the positions shown below.
2. Tune the set to 98MHz.
3. Adjust RV1 so that the frequency counter reading becomes
2. Tune the set to 98MHz.
3. Adjust RV1 so that the frequency counter reading becomes
76,000 Hz.
Specification Value :
Adjustment Location : MAIN board (See page 13)
BLACK
10.64MHz
BLUE
10.67MHz
RED
10.70MHz
ORANGE
10.73MHz
WHITE
10.76MHz
0.01
µ
F
FM RF Signal generator
FM ANT IN terminal
Carrier frequency : 98MHz
IF frequency : According to
the color of CF1.
Modulation : no modulation
Output level : 0.1V (100dB)
IF frequency : According to
the color of CF1.
Modulation : no modulation
Output level : 0.1V (100dB)
color
mark
mark
CF1
Frequency counter
75,800 – 76,200 Hz
Frequency counter
0.01
µ
F
+
–
–
33k
Ω
IC1 Pin
4
IC1 Pin
7
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