Eiki LC-XB42, Service Manual

Page: 30 / 110

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Electrical Adjustments
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 “
TP_G1
” (+) and
chassis ground (-).
5. Select group no. “
100
”, item no. “
6
” and change data value
to adjust amplitude “
a
” to be
1.2V
.
(a)
white level
white level
.
50% White adjustment [Video]
1. Enter the service mode.
2. Receive the 16-step grey scale composite video signal
with
Video[Video]
mode.
3. Select group no. “
100
” item no. “
7
” (Red) or “
8
” (Blue), and
change Data values respectively to make a proper white
balance.
Confirm that the same white balance is obtained in video
and computer input.
⁄0
White Balance adjustment [Video]
After replacing the G-sensor circuit (IC3851, IC1802 and
peripheral circuit), readjust the Keystone Offset adjustment
as follows.
1. Put the projector on a horizontal place with the adjust-
able feet being minimum range and then enter the ser-
vice mode.
2. Select group no. “
102
”, item no. “
3
” and set data value
from “
0
” to “
5
”.
3. By pressing the
SELECT
button, the Keystone Offset
adjustment will start.
4. When it has completed, the "OK" message will appear on
the screen.
5. By pressing any button on the projector or the remote
control, the "OK" message will disappear.
(Data value of Group no. “102”, item no. “3” will be back
from “5” to “0” for initial value.)
⁄1
Keystone Offset adjustment
If the correction of the Color shading adjustment is neces-
sary, please adjust the "Color shading" by using the "COLOR
SHADING CORRECTION" software supplied separately.The
color shading correction adjustment for this model should
be performed with the whole-gray patterns specified as
below.
4-input patterns:
6.25% gray, 12.5% gray, 25% gray, 50% gray
⁄2
Color Shading Correction adjustment