Sanyo PLC-XU75A, Руководство по обслуживанию

Страница: 29 / 102

-9-
Electrical Adjustments
Gain adjustment [component]
1. Enter the service mode.
. Receive the 16-step grey scale 480i-component signal
with
computer1 [component]
mode.
3. Connect an oscilloscope to test point “
tP_G1
” (+)
and chassis ground (-).
4. Select group no. “
0
”, item no. “
3
” and adjust the ampli-
tude “
a
” to be minimum by changing the Data value.
(a)
White Level
1. Enter the service mode.
. Receive the 16-step grey scale composite video sig-
nal with
Video [Video]
mode.
3. To start the auto-calibration for Component adjust-
ment, select group no. “
260
”, item no. “
0
” and then
change data value from “
0
” to “
1
”. After the auto-cali-
bration completed, "OK" will appear on the screen.
b
Auto Calibration adjustment [Video]
Gain adjustment [Video]
1. Enter the service mode.
. Receive the 16-step grey scale composite video signal
with
Video [Video]
mode.
3. Connect an oscilloscope to test point “
tP_G1
” (+)
and chassis ground (-).
4. Select group no. “
20
”, item no. “
0
” and adjust the
amplitude “
a
” to be minimum by changing the Data
value.
(a)
White Level
below adjustment is performed when the above auto
calibration is failed.
Pedestal adjustment [component]
1. Enter the service mode.
. Receive the 16-step grey scale 480i-component signal
with
computer1 [component]
mode.
3. Connect an oscilloscope to test point “
tP_G1
” (+)
and chassis ground (-).
4. Select group no. “
0
”, item no. “
0
” and change data
value to adjust the pedestal level and black level to be
the same level.
5. Connect an oscilloscope to test point “
tP_r1
” (+)
and chassis ground (-).
6. Select item no. “
1
” and change data value to adjust
the pedestal level and black level to be the same lev-
el.
7. Connect an oscilloscope to test point “
tP_B1
” (+)
and chassis ground (-).
8. Select item no. “
2
” and change data value to adjust
the pedestal level and black level to be the same lev-
el.
P
edestal Lebel
Blac
k Lebel
1. Enter the service mode.
. Receive the 16-step grey scale 480i-component sig-
nal with
computer1 [component]
mode.
3. To start the auto-calibration for Component adjust-
ment, select group no. “
260
”, item no. “
0
” and then
change data value from “
0
” to “
1
”. After the auto-cali-
bration completed, "OK" will appear on the screen.
Below adjustments are performed when the above
auto calibration is failed.
v
Auto Calibration adjustment [Component]