Eiki LC-XB100A, Service Manual

Page: 32 / 118

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Electrical Adjustments
Gain adjustment [Pc]
1. Enter the service mode.
2. Receive the 16-step grey scale computer signal with
computer1 [rGB]
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.
5. Connect an oscilloscope to test point “
tP35r
” (+)
and chassis ground (-).
6. Select group no. “
0
”, item no. “
4
” and adjust the ampli-
tude “
a
” to be minimum by changing the Data value.
7. Connect an oscilloscope to test point “
tP35B
” (+) and
chassis ground (-).
8. Select group no. “
0
”, item no. “
5
” and adjust the ampli-
tude “
a
” to be minimum by changing the Data value.
(a)
White Level
Pedestal adjustment [Pc]
1. Enter the service mode.
2. Receive the 16-step grey scale computer signal with
computer1 [rGB]
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 pedestal level and black level to be
the same level.
5. Connect an oscilloscope to test point “
tP35r
” (+)
and chassis ground (-).
6. Select item no. “
1
” and change data value to adjust the
pedestal level and black level to be the same level.
7. Connect an oscilloscope to test point “
tP35B
” (+) and
chassis ground (-).
8. Select item no. “
2
” and change data value to adjust the
pedestal level and black level to be the same level.
P
edestal Lebel
Blac
k Lebel
1. Enter the service mode.
2. Receive the 16-step grey scale computer signal with
computer1 [rGB]
mode.
3. To start the auto-calibration for PC adjustment, select
group no. “
260
”, item no. “
0
” and then change data
value from “
0
” to “
1
”. After the auto-calibration com-
pleted, "OK" will appear on the screen.
4. auto calibration adjustment [Pc]
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
computer2 [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 pedestal level and black level to be
the same level.
5. Connect an oscilloscope to test point “
tP35r
” (+)
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.
1. Enter the service mode.
2. Receive the 8 color 100% color bar 480i-component
signal with
computer2 [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.
5. auto calibration adjustment [component]
Below adjustments are performed when the above
auto calibration is failed.
7. Connect an oscilloscope to test point “
tP35B
” (+)
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
Gain adjustment [component]
1. Enter the service mode.
2. Receive the 16-step grey scale 480i-component signal
with
computer2 [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