Sony CFD-CD777SMK2 Service Manual page 17

QQ
3 7 63 1515 0
Procedure:
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.
2. Put the disc (YEDS-18) and press NX 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)
low focus gain
TE
L 13942296513
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)
www
.
http://www.xiaoyu163.com
VOLT/DIV: 100 mV
TIME/DIV: 2 ms
VOLT/DIV: 100 mV
TIME/DIV: 2 ms
VOLT/DIV: 100 mV
TIME/DIV: 2 ms
VOLT/DIV: 1 V
TIME/DIV: 2 ms
x ao u163
y
i
http://www.xiaoyu163.com
2 9
8
• Incorrect Examples (fundamential wave appears)
)
(
100 mV
0 V
200 mV
0 V
Q Q
3 6 7 1 3
75 mV
0 V
0 V
.
CFD-CD777SMK2
9 4 2 8
low tracking gain
high tracking gain
high fandamential wave )
than for low gain
1 5 0 5 8 2 9 9 4
m
co
9 9
VOLT/DIV: 1 V
TIME/DIV: 2 ms
0 V
VOLT/DIV: 1 V
TIME/DIV: 2 ms
0 V
2 8 9 9
17