Sony CFD-V37 Service Manual page 12

• Good Example
• Incorrent Examples (DC level changes more than on adjusted
waveform)
low focus gain
high focus gain
5. Connect an oscilloscope between TP (TE) and TP (VC).
Insert disc (YEDS-18) and press the CD ^ button.
6.
7. Check that the waveform is as shown in the figure below.
(tracking waveform)
•
VOLT/DIV : 100mV
TIME/DIV : 1ms
100mV
0V
VOLT/DIV : 100mV
TIME/DIV : 2ms
200mV
high tracking gain
(high fundamental wave than for low gain)
0V
[MAIN BOARD]
VOLT/DIV : 100mV
TIME/DIV : 2ms
75mV
0V
VOLT/DIV : 1V
TIME/DIV : 2ms
0V
— 12 —
Incorrect Examples (Fundamental wave appears)
low tracking gain
TP(RF)
VOLT/DIV : 1V
TIME/DIV : 2ms
0V
VOLT/DIV : 1V
TIME/DIV : 2ms
0V
TP(FE)
TP(VC)
TP(TE)
Osilloscope
(DC range)
TP(FE) TP(TE)
+
–
TP(VC)