Eiki LC-XG110, Руководство по обслуживанию

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Electrical Adjustments
1. Receive the 100%whole-white computer signal with
Computer 1 [Analog RGB] mode.
2. Enter the service mode.
3. Measure luminance on the screen with the luminance
meter. It is
A
for the reading of luminance meter.
4. Change the signal source to the 50%whole-white
computer signal with Computer 1 [Analog RGB]
mode.
5. Select group no. “
4
”, Item no. “
6
” and change the Data
value to make the reading of luminance meter to be
A
x 23%
.
Luminance adjustment adjustment [PC]
7
1. Receive the 16-step gray scale composite video sig-
nal with Video mode.
2. Enter the service mode.
3. Connect a digital voltmeter to test point “
TPVRB
” (+)
and chassis ground (-).
4. Select group no. “
5
”, Item no. “
17
” and adjust the volt-
age to be
1.0
±0.05Vdc by changing the Data value.
5. Connect a digital voltmeter to test point “
TPGVRT
(+)
and chassis ground (-).
6. Select Item no. “
18
” and adjust the voltage to be
2.5
±0.05Vdc by changing the Data value.
A/D Ref. Voltage adjustment [Video]
8
1. Receive the 16-step gray scale composite video sig-
nal with Video mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point “
TP13G
” (+)
and chassis ground (-).
4. Select group no. “
3
”, Item no. “
1
” and adjust the ampli-
tude “a” to be
1.35
±0.1V by changing the Data value.
* This changes all the RGB amplitude at the same
time. Item no. “2” can be adjusted for G only.
5. Connect an oscilloscope to test point “
TP13B
” (+)
and chassis ground (-).
6. Select Item no. “
3
” and adjust the amplitude “a” to be
1.35
±0.1V by changing the Data value.
7. Connect an oscilloscope to test point “
TP13R
” (+)
and chassis ground (-).
8. Select Item no. “
4
” and adjust the amplitude “a” to be
1.35
±0.1V by changing the Data value.
(a)
A/D Input adjustment [Video]
9
1. Receive the 100%whole-Black composite video sig-
nal with Video mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point “
TP531
” (+) and
chassis ground (-).
4. Select group no. “
5
”, Item no. “
11
” and adjust the
black level to be maximum amplitude by changing the
Data value.
5. Connect an oscilloscope to test point “
TP501
” (+) and
chassis ground (-).
6. Select Item no. “
12
” and adjust the black level to be
maximum amplitude by changing the Data value.
7. Connect an oscilloscope to test point “
TP561
” (+) and
chassis ground (-).
8. Select Item no. “
13
” and adjust the black level to be
maximum amplitude by changing the Data value.
Note: This adjustment should be done after A/D Input
adjustment [Video].
Pedestal Level
Black Level
Pedestal adjustment [Video]
10
1. Receive the 16-step gray scale video composite sig-
nal with Video mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point “
TP531
” (+)
and chassis ground (-).
4. Select group no. “
4
”, Item no. “
3
” and adjust the white
level to be minimum amplitude by changing the Data
value.
5. Connect an oscilloscope to test point “
TP501
” (+)
and chassis ground (-).
6. Select Item no. “
4
” and adjust the white level to be
minimum amplitude by changing the Data value.
7. Connect an oscilloscope to test point “
TP561
” (+)
and chassis ground (-).
8. Select Item no. “
5
” and adjust the white level to be
minimum amplitude by changing the Data value.
(a)
White Level
Video Gain adjustment [Video]
11