Read Sony CFD-6 Service Manual online
– 12 –
5. Connect oscilloscope to TP(TO) and TP(VC) on MAIN board.
6. Adjust RV704 on digital board so that the waveform is as shown
6. Adjust RV704 on digital board so that the waveform is as shown
in the figure below. (Tracking Gain Adjustment)
7. Release test mode after adjustment is completed.
0V
low tracking gain
high tracking gain
high fundamental wave
than for low gain
high fundamental wave
than for low gain
high focus gain
0V
0V
VOLT / DIV : 1V
TIME / DIV : 2ms
TIME / DIV : 2ms
VOLT / DIV : 1V
TIME / DIV : 2ms
TIME / DIV : 2ms
VOLT / DIV : 1V
TIME / DIV : 2ms
TIME / DIV : 2ms
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Incorrect Examples (fundamental wave appears)
+
–
oscillcope
(DC range)
TP (TO)
TP (FO)
TP (VC)
[ MAIN BOARD ]
Adjustment Location : Main board (page 13)
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The time until music starts becomes
longer for STOP
→
^
button or
automatic selection.
( =, + buttons pressed.)
(Normally takes about 2 seconds.)
( =, + buttons pressed.)
(Normally takes about 2 seconds.)
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Music does not start and disc
continues to rotate for STOP
→
^
button or automatic selection.
( =, + buttons pressed.)
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Sound is interrupted during PLAY.
Or time counter display stops
progressing.
progressing.
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More noise during 2-axis device
operation.
Symptoms
Gain
Focus
Tracking
low
low or high
–
low
–
low
high
high
The following is a simple adjustment method.
– Primary Adjustment –
Note :
Note :
Since exact adjustment cannot be performed, remember the
positions of the controls before performing the adjustment.If
the positions after the primary adjustment are only a little
different, return the controls to the original position.
positions of the controls before performing the adjustment.If
the positions after the primary adjustment are only a little
different, return the controls to the original position.
Procedure :
1. Keep the set horizontal.
1. Keep the set horizontal.
If the set is not horizontal, this adjustment cannot be performed
due to the gravity against the 2-axis device.
due to the gravity against the 2-axis device.
2. Insert disc (YEDS-18) and press ^ button.
3. Connect oscilloscope to TP(FO) and TP (VC) on MAIN board.
4. Adjustment RV702 on MAIN board so that the waveform is as
3. Connect oscilloscope to TP(FO) and TP (VC) on MAIN board.
4. Adjustment RV702 on MAIN board so that the waveform is as
shown in the figure below. (focus gain adjustment)
100mV
0V
200mV
low focus gain
high focus gain
0V
75mV
0V
VOLT / DIV : 100mV
TIME / DIV : 2ms
TIME / DIV : 2ms
VOLT / DIV : 100mV
TIME / DIV : 2ms
TIME / DIV : 2ms
VOLT / DIV : 100mV
TIME / DIV : 2ms
TIME / DIV : 2ms
r
Incorrect Examples (DC level changes more than on adjusted
waveform)
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