Eiki LC-XB41N, Service Manual

Page: 28 / 124

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Electrical Adjustments
Pedestal adjustment [Pc]
1. Enter the service mode.
. 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 val-
ue 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
gain adjustment [Pc]
1. Enter the service mode.
. 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
1. Enter the service mode.
. 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.
c
Auto Calibration adjustment [PC]
Pedestal adjustment [component]
1. Enter the service mode.
. 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 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.
. Receive the 16-step grey scale 480i-component sig-
nal 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.
v
Auto Calibration adjustment [Component]
* Before setting, you need to check which type of LCD pan-
el is placed on the projector according to the item "LCD
Panel/Prism Ass'y removal" in the chapter "Optical Parts
Disassembly".
1. Enter the service mode.
. Panel Type Check
Select group no. “
290
”, item no. “
0
”. Check the data
value as follows;
Data value: 0 For L-Type of LCD Panel
Data value: 0 For R-Type of LCD panel
3. Panel Type Setting
Select group no. “
290
”, item no. “
1
” and change data
value from 10 to 0 or 0 depending on your LCD Panel
type. When the data value reaches 0 or 0, it returns
to 10 quickly. The gamma-characteristics changes ac-
cording to your selection.
x
Panel Type Check and Setting
Below adjustments are performed when the above auto
calibration is failed.
Below adjustments are performed when the above auto
calibration is failed.