Sony CFD-V3 / CFD-V7 / CFD-V7L Service Manual ▷ View online
9
CFD-V3/V7/V7L
SECTION 4
DIAL POINTER INSTALLATION
Note : Follow the installation procedure in the numerical order given.
1
Align the pointer with the groove of “cabinet (front) sub ASSY” and insert it as shown in the illustration.
2
Align knob (TU) with “cabinet (front) sub ASSY” and fasten the screw.
3
Turn the knob (TU) fully in the direction of the allow as shown in the illustration.
4
Turn the tuning capacitor gear fully in the direction of the allow as shown in the illustration.
5
Fasten the “cabinet (front) sub ASSY” and cabinet (rear) with the screws.
1
Pointer
knob (Tu)
Cabinet (front) sub ASSY
2
Screw (+BVTP 2.6
×
8)
3
Tuning knob
4
Tuning capacitor gear
5
Cabinet (rear)
10
CFD-V3/V7/V7L
5-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
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. The adjustments should be performed with the rated power sup-
4. The adjustments should be performed with the rated power sup-
ply voltage (9V) unless otherwise noted.
Torque Measurement
Torque
Torque Meter
Meter Reading
1.77 – 5.88 mN•m
Forward
CQ-102C
(18 – 60 g•cm)
(0.25 – 0.83 oz•inch)
Forward
0.1 – 0.49 mN•m
Back Tension
CQ-102C
(1.0 – 5.0 g•cm)
(0.014 – 0.069 oz•inch)
4.42 – 9.31 mN•m
Fast Forward
CQ-201B
(45 – 95 g•cm)
(0.62 – 1.32 oz•inch)
4.42 – 9.31 mN•m
Rewind
CQ-201B
(45 – 95 g•cm)
(0.62 – 1.32 oz•inch)
Tape Tension Measurement
Torque Meter
Meter Reading
CQ-403A
more than 60g
(more than 2.12 oz)
TUNER SECTION
AM Section
Function switch : AM or LW
Volume
Volume
: MIN
FM Section
Function switch : FM
Volume
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 RF signal
generator
generator
22.5kHz frequency deviation by
1kHz signal.
Output level : as low as possible
1kHz signal.
Output level : as low as possible
telescopic
antenna
terminal
antenna
terminal
0.01
µF
set
32
Ω
J301 (phones)
level meter
SECTION 5
ADJUSTMENTS
5-2. ELECTRICAL ADJUSTMENTS
TAPE RECORDER SECTION
Standard Output Level
Output terminal
HP OUT
load impedance
32
Ω
output signal level
0.25V (–10dB)
Test Tape
Type
Signal
Used for
WS-48A
3kHz, 0dB
Tape Speed Adjustment
Tape Speed Adjustment
Procedure :
Procedure :
Mode : Playback
Adjustment Value : 3,000Hz
Standard Value : 2,940 - 3,060Hz
Standard Value : 2,940 - 3,060Hz
Frequency difference between the beginning and the end of the tape
should be within 1.5% (45Hz).
should be within 1.5% (45Hz).
set
test tape
WS-48A
(3kHz, 0dB)
WS-48A
(3kHz, 0dB)
32
Ω
digital frequency
counter
counter
J301 (phones)
Tape speed adjustment
control inside motor
control inside motor
0dB = 0.775V
Adjustment Location : Mechanism deck
0dB = 1
µV
11
CFD-V3/V7/V7L
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
( ) : V3/V7: AEP, UK, CET, SP,KR
< > : V7:Italian
[ ] : V7L
< > : V7:Italian
[ ] : V7L
AM/LW IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T2
455kHz
EXCEPT V7L
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
520kHz ( 520kHz) < 516kHz>
CT4
1,780kHz (1,680kHz) <1,630kHz>
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
620kHz
CT3
1,400kHz
V7L
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
145kHz
CT4, CV2
300kHz
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
160kHz
CT3, CV3
260kHz
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
10.7MHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
86.5MHz ( 87.0MHz) < 87.35MHz> [ 87.0MHz]
CT2
109.5MHz (108.3MHz) <108.25MHz> [108.3MHz]
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
86.5MHz ( 87.0MHz) < 87.35MHz> [ 87.0MHz]
CT1
109.5MHz (108.3MHz) <108.25MHz> [108.3MHz]
Adjustment Location : Main board (See page 12)
CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.
In case of operation check, confirm that focus bias.
Focus Bias Check
1. Connect the oscilloscope between TP (RF) and GND on CD
1. Connect the oscilloscope between TP (RF) and GND on CD
board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the 7 button two times (LPC ON).
4. Confirm that the oscilloscope waveform is as shown in the fig-
3. Press the 7 button two times (LPC ON).
4. Confirm that the oscilloscope waveform is as shown in the fig-
ure below. (eye pattern)
A good eye pattern means that the diamond shape (
A good eye pattern means that the diamond shape (
◊) in the
center of the waveform can be clearly distinguished.
•
RF Signal Reference Waveform (eye pattern)
When observing the eye pattern, set the oscilloscope for AC range
and raise certical sensitivity
and raise certical sensitivity
RF level
0.7 – 1.0 Vp-p (LPC ON)
1.0 – 1.4 Vp-p (LPC OFF)
0.7 – 1.0 Vp-p (LPC ON)
1.0 – 1.4 Vp-p (LPC OFF)
VOLT/TV : 200mV
TIME/DIV : 500 nS
TIME/DIV : 500 nS
CD SECTION
How to put the set into CD Test Mode
1. Set the function switch to power off.
2. Set the function switch to CD.
3. Set Test mode by momentarily shorting both of the IC801 51pin
1. Set the function switch to power off.
2. Set the function switch to CD.
3. Set Test mode by momentarily shorting both of the IC801 51pin
to GND. (Shorting the terminals momentarily is sufficient).
The set is into CD test mode (
The set is into CD test mode (
88 is displayed).
4. Turn the power off to release test mode.
S351
R812
R811
R811
R809
R810
-1 -2
R851
C844
C
8
C8
R815
R814
R813
R814
R813
C801
R816
R
JC310
C810
JW316
JW317
JW318
320
21
IC801
GND
51pin
TEST mode : momentarily short
[MAIN BOARD] (Conductor side)
C730
R730
R729
C704
C736
C734
R704
R702
R703
R705
R701
C703
IC701
C731
R706
C
703
C743
C744
C
4
2
R709
R710
R708
C705
R711
TP
(RF)
J
JW
JW726
C
C747
JW710
9
oscilloscope
(AC range)
[CD BOARD] (Conductor side)
(GND)
TP (RF)
• Abbreviation
CET : East European & Russian
SP : Singapore
CET : East European & Russian
SP : Singapore
12
CFD-V3/V7/V7L
Adjustment Location :
[MAIN BOARD]
(Component side)
(Component side)
[MAIN BOARD]
(Conductor side)
(Conductor side)
CT1 : FM Tracking Adjustment
CT3 : AM/LW Tracking Adjustment
L3: AM/LW Tracking Adjustment
CV3: LW Tracking Adjustment (V7L)
T2 : AM/LW IF Adjustment
T1 : FM IF Adjustment
L2 : FM Frequency Coverage Adjustment
CT4: AM/LW Frequency
Coverage Adjustment
Coverage Adjustment
CT2 : FM Frequency
Coverage Adjustment
Coverage Adjustment
L4 : AM/LW Frequency
Coverage Adjustment
Coverage Adjustment
CV2 : LW Frequency Coverage Adjustment
(V7L)
L1 : FM Tracking Adjustment
Click on the first or last page to see other CFD-V3 / CFD-V7 / CFD-V7L service manuals if exist.