Sanyo PLC-XU4000, Service Manual

Page: 32 / 110

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Electrical Adjustments
Gain adjustment [component]
1. Enter the service mode.
2. Receive the 16-step grey scale 480i-component signal
with
computer1 [component]
mode.
3. Connect an oscilloscope to test point “
tP35G
” (+) 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.
2. Receive the 16-step grey scale composite video sig-
nal with
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.
Gain adjustment [Video]
1. Enter the service mode.
2. Receive the 16-step grey scale composite video signal
with
Video [Video]
mode.
3. Connect an oscilloscope to test point “
tP35G
” (+) and
chassis ground (-).
4. Select group no. “
20
”, item no. “
0
” and adjust the ampli-
tude “
a
” to be minimum by changing the Data value.
(a)
White Level
Below adjustment is performed when the above auto
calibration is failed.
4. Auto calibration adjustment [Video]
1. Enter the service mode.
2. Receive the 8 color 100% color bar 480i-component
signal 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.
3. Auto calibration adjustment [component]
Below adjustments are performed when the above auto
calibration is failed.
Pedestal adjustment [component]
1. Enter the service mode.
2. Receive the 16-step grey scale 480i-component signal
with
computer1 [component]
mode.
3. Connect an oscilloscope to test point “
tP35G
” (+) and
chassis ground (-).
4. Select Group No. “
0
”, Item No. “
0
” and change data
value to adjust the black level to be minimum.
5. Connect an oscilloscope to test point “
tP35r
” (+) and
chassis ground (-).
6. Select Item No. “
1
” and change data value to adjust the
black level to be minimum.
7. Connect an oscilloscope to test point “
tP35B
” (+) and
chassis ground (-).
8. Select Item No. “
2
” and change data value to adjust the
black level to be minimum.
Blac
k Lebel