Read Sony CFD-CD777S Service Manual online
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Procedure:
1. Keep the set horizontal.
1. Keep the set horizontal.
If the set is not horizontal, this adjustment cannot be per-
formed due to the gravity against the 2-axis device.
formed due to the gravity against the 2-axis device.
2. Put the disc (YEDS-18) and press
^ button.
3. Connect the oscilloscope to solder bridge (FOCUS) 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)
• Incorrect Examples (DC level changes more than on adjusted
waveform)
)
(
VOLT/DIV: 100 mV
TIME/DIV: 2 ms
TIME/DIV: 2 ms
100 mV
0 V
VOLT/DIV: 100 mV
TIME/DIV: 2 ms
TIME/DIV: 2 ms
200 mV
0 V
VOLT/DIV: 100 mV
TIME/DIV: 2 ms
TIME/DIV: 2 ms
75 mV
0 V
low focus gain
high focus gain
5. Connect oscilloscope to solder bridge (TRACKING) and TP
(VC) on MAIN board.
6. Adjust RV704 on MAIN board so that the waveform is as
shown in the figure below. (Tracking gain adjustment)
VOLT/DIV: 1 V
TIME/DIV: 2 ms
TIME/DIV: 2 ms
0 V
• Incorrect Examples (fundamential wave appears)
VOLT/DIV: 1 V
TIME/DIV: 2 ms
TIME/DIV: 2 ms
0 V
VOLT/DIV: 1 V
TIME/DIV: 2 ms
TIME/DIV: 2 ms
0 V
low tracking gain
high tracking gain
high fandamential wave
than for low gain
high fandamential wave
than for low gain
)
(
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