Read Sony CFD-44 Service Manual online
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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 : Common
( ) : US, Canadian model
< > : AEP, UK, Italian model
AM IF ADJUSTMENT
Adjust for a maximum reading on LEVEL METER.
CFT1
455kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for following values on digital voltmeter.
Display indication
(530 kHz)
<531kHz>
(1,710 kHz)
<1,611kHz>
Display voltmeter reading
0.8
±
0.1V
5.5
±
0.6V
Adjustment part
L4
confirm
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on LEVEL METER.
L3
(620kHz) <621kHz>
CT2
(1,400kHz) <1,404kHz>
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for following values on digital voltmeter.
Display indication
108 MHz
87.5MHz
Display voltmeter reading
4.5
±
0.2V
2.0
±
0.2V
Adjustment part
L2
confirm
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on LEVEL METER.
L1
87.5MHz
CT1
108.0MHz
Adjustment Location : Main board (See page 14)
CD SECTION
Note on Adjustment
1.
Perform adjustment in test mode.
After adjustment, be sure to release test mode.
After adjustment, be sure to release test mode.
2.
Perform adjustments in the order given.
3.
Use the disc (YEDS-18. Part No. 3-7029-101-01) only when
so indicated.
so indicated.
How to put the Set into Test Mode
Turn the power on while pressing 3 buttons. (1 button, RADIO
button and STOP
button and STOP
p button.)
How to release Test Mode
Turn the power off.
Before adjustment
Put the set into test mode and perform the following checks.
Repair if there are any problems.
Repair if there are any problems.
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Sled Motor Check
1. Press
+,=buttons and confirm that the Optical pick-up
moves smoothly from the innermost to outermost circumfer-
ence and back smoothly and with no catching or abnormal
noises.
ence and back smoothly and with no catching or abnormal
noises.
+
: Optical pick-up moves to the outer circumference
=
: Optical pick-up moves to the inner circumference
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Focus Search Check
1. Press CD PLAY
· button. (Focus search operation is per-
formed continuously.)
2. Look at the Optical pick-up objective lens and confirm that it
moves up and down smoothly, with no catching or abnormal
noises.
noises.
3. Press STOP
p button.
Confirm that focus search operation stops. If it does not ,
press OFF button again longer.
Note :
When the malfunction is occurred by mis-passing other
keys, turn off the power and check again from making
the test mode.
the test mode.
E-F Balance Adjustment
This adjustment is to be done when the optical pick-up block is
replaced.
replaced.
Procedure :
1. Connect the oscilloscope between TP (TO) and TP (VC) on
CD main board.
2. Put the set into test mode.
3. Press the
3. Press the
+ and = buttons to move the optical pick-up to
the center.
4. Insert disc (YEDS-18) and press CD PLAY
· button.
5. Adjust RV703 so that the oscilloscope traveres waveform is
symmetrical, as shown in the figure below.
6. Release test mode after adjustment is completed.
A
OV
B
C
VOLT / DIV : 1V
TIME / DIV :1ms
TIME / DIV :1ms
A = B
C = 400mV
±
100mV
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