Read Sony CFD-S27 (serv.man2) Service Manual online
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5. Connect oscilloscope to TP (TO) and TP (VC) on MAIN board.
6. Adjust RV704 on MAIN board so that the waveform is as shown
6. Adjust RV704 on MAIN board so that the waveform is as shown
in the figure below. (Tracking gain adjustment)
VOLT/DIV : 1V
TIME/DIV : 2ms
TIME/DIV : 2ms
• Incorrect Examples (fundamental waveform appears)
low tracking gain
VOLT/DIV : 1V
TIME/DIV : 2ms
TIME/DIV : 2ms
high tracking gain
High fundamental wave
than for low gain
VOLT/DIV : 1V
TIME/DIV : 2ms
TIME/DIV : 2ms
VOLT/DIV : 100mV
TIME/DIV : 2ms
TIME/DIV : 2ms
• Incorrect Examples (DC level changes more than on adjusted
waveform)
VOLT/DIV : 100mV
low focus gain
TIME/DIV : 2ms
VOLT/DIV : 100mV
high focus gain
TIME/DIV : 2ms
[MAIN BOARD]
75mV
0V
200mV
0V
0V
0V
0V
( )
100mV
0V
TP (TO)
TP (FO)
oscilloscope
(DC range)
TP (VC)
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