Sony CFD-980 Service Manual page 20

QQ
3 7 63 1515 0
• Good Example
• Incorrent Examples (DC level changes more than on adjusted
waveform)
low focus gain
high focus gain
TE
L 13942296513
5. Connect the oscilloscope between TP (TE) and TP (VC).
Insert disc (YEDS-18) and press the CD ^ button.
6.
7. Adjust RV704 so that the waveform is as shown in the figure
below. (tracking gain adjustment)
• Incorrect Examples (fundamental wave appears)
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VOLT/DIV : 20mV
TIME/DIV : 1ms
25mV
0V
VOLT/DIV : 20mV
TIME/DIV : 2ms
50mV
0V
VOLT/DIV : 100mV
TIME/DIV : 2ms
10mV
0V
VOLT/DIV : 0.1V
TIME/DIV : 2ms
0V
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2 9
8
low tracking gain
high tracking gain
(high fandametial wave than for low gain)
[MAIN BOARD] (Component side)
Q Q
3 6 7 1 3 1 5
TP(TO)
TP(VC)
TP(FO)
co
.
9 4 2 8
VOLT/DIV : 0.1V
TIME/DIV : 2ms
0V
VOLT/DIV : 0.1V
TIME/DIV : 2ms
0V
0 5 8 2 9 9 4 2 8
Osillloscope
(DC range)
+
–
TP(VC)
m
9 9
9 9