DOWNLOAD Sony CFD-V27 Service Manual ↓ Size: 6.1 MB | Pages: 57 in PDF or view online for FREE

Model
CFD-V27
Pages
57
Size
6.1 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cfd-v27.pdf
Date

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.
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.
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
Adjustment Value : normal tape speed
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).
Adjustment Location :
HP OUT
32 
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:
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.)
3.
Do not use a magnetized screwdriver for the adjustments.
4.
After the adjustments, apply suitable locking compound to the
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
32 
test tape
WS-48A
(3kHz, 0dB)
set
digital frequency
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
BAND : FM
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.
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
AM RF signal
generator
0.01
µ
F
FM RF signal
generator
FM ANT IN
terminal
75kHz (100%) amplitude modulation
by 1kHz signal.
Output level : as low as possible
32
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
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)
color
mark
CF1
Frequency counter
75,800 – 76,200 Hz
Frequency counter
0.01
µ
F
+
33k 
IC1 Pin 
4
IC1 Pin 
7
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