Sanyo PLC-XT10 Service Manual page 27

Electrical Adjustments
7
Luminance adjustment adjustment [PC]
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
A
meter. It is for the reading of luminance meter.
4. Change the signal source to the 50%whole-white
computer signal with Computer 1 [Analog RGB]
mode.
4
5. Select group no. " ", Item no. "
value to make the reading of luminance meter to be
x 23%
.
8
A/D Ref. Voltage adjustment [Video]
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 "
and chassis ground (-).
5
4. Select group no. " ", Item no. "
1.0
age to be ±0.05Vdc by changing the Data value.
5. Connect a digital voltmeter to test point "
and chassis ground (-).
18
6. Select Item no. " " and adjust the voltage to be
±0.05Vdc by changing the Data value.
9
A/D Input adjustment [Video]
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 "
and chassis ground (-).
3
4. Select group no. " ", Item no. "
1.35
tude "a" to be ±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 "
and chassis ground (-).
3
6. Select Item no. " " and adjust the amplitude "a" to be
1.35
±0.1V by changing the Data value.
7. Connect an oscilloscope to test point "
and chassis ground (-).
4
8. Select Item no. " " and adjust the amplitude "a" to be
1.35
±0.1V by changing the Data value.
(a)
6
" and change the Data
A
TPVRB
" (+)
17
" and adjust the volt-
TPGVRT
(+)
2.5
TP13G
" (+)
1
" and adjust the ampli-
TP13B
" (+)
TP13R
" (+)
-27-
10
Pedestal adjustment [Video]
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 "
chassis ground (-).
5
4. Select group no. " ", Item no. "
black level to be maximum amplitude by changing the
Data value.
5. Connect an oscilloscope to test point "
chassis ground (-).
12
6. Select Item no. " " and adjust the black level to be
maximum amplitude by changing the Data value.
7. Connect an oscilloscope to test point "
chassis ground (-).
13
8. Select Item no. " " and adjust the black level to be
maximum amplitude by changing the Data value.
Black Lebel
Pedestal Lebel
Note: This adjustment should be done after A/D Input
adjustment [Video].
11
Video Gain adjustment [Video]
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 "
and chassis ground (-).
4
4. Select group no. " ", Item no. "
level to be minimum amplitude by changing the Data
value.
5. Connect an oscilloscope to test point "
and chassis ground (-).
4
6. Select Item no. " " and adjust the white level to be
minimum amplitude by changing the Data value.
7. Connect an oscilloscope to test point "
and chassis ground (-).
5
8. Select Item no. " " and adjust the white level to be
minimum amplitude by changing the Data value.
TP531
" (+) and
11
" and adjust the
TP501
" (+) and
TP561
" (+) and
TP531
" (+)
3
" and adjust the white
TP501
" (+)
TP561
" (+)
White Level
(a)