Sanyo PLC-XU40 Service Manual page 27

Electrical Adjustments
x
Signal Center adjustment
1. Receive the 16-step grey scale computer signal with
Computer [Analog RGB] mode.
2. Enter the service mode.
3. Connect a digital voltmeter to test point "
(+) and chassis ground (-).
1
4. Select item no. " and adjust the voltage to be
±0.1Vdc by changing the Data value.
5. Connect a digital voltmeter to test point "
(+) and chassis ground (-).
2
6. Select item no. " " and adjust the voltage to be
±0.1Vdc by changing the Data value.
7. Connect a digital voltmeter to test point "
(+) and chassis ground (-).
3
8. Select item no. " " and adjust the voltage to be
±0.1Vdc by changing the Data value.
c
PSIG adjustment
1. Receive the 16-step gray scale computer signal with
Computer [Analog RGB] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point "
and chassis ground (-).
22
4. Select item no. " " and adjust the amplitude "a" to be
9.5
±0.1V by changing the Data value.
23
5. Select item no. " " and adjust the amplitude "b" to be
1.0
±0.1V by changing the Data value.
v
Gain adjustment [PC]
1. Receive the 16-step gray scale computer signal with
Computer [Analog RGB] mode.
2. Enter the service mode.
TP505R
" 3. Connect an oscilloscope to test point "
and chassis ground (-).
7.50
4. Select item no. "
minimum by changing the Data value.
TP503G
" 5. Connect an oscilloscope to test point "
and chassis ground (-).
7.50
6. Select item no. "
minimum by changing the Data value.
TP501B
" 7. Connect an oscilloscope to test point "
and chassis ground (-).
7.50
8. Select item no. "
minimum by changing the Data value.
b
Gain adjustment [Video]
1. Receive the 16-step gray scale composite video sig-
nal with Video [Video] mode.
2. Enter the service mode.
TP3501
" (+) 3. Connect an oscilloscope to test point "
and chassis ground (-).
4. Select item no. "
minimum by changing the Data value.
5. Connect an oscilloscope to test point "
and chassis ground (-).
6. Select item no. "
minimum by changing the Data value.
7. Connect an oscilloscope to test point "
and chassis ground (-).
8. Select item no. "
(b) (a)
minimum by changing the Data value.
-27-
4
" and adjust the amplitude "a" to be
5
" and adjust the amplitude "a" to be
6
" and adjust the amplitude "a" to be
White Level
(a)
4
" and adjust the amplitude "a" to be
5
" and adjust the amplitude "a" to be
6
" and adjust the amplitude "a" to be
White Level
(a)
TP505R
" (+)
TP503G
" (+)
TP501B
" (+)
TP505R
" (+)
TP503G
" (+)
TP501B
" (+)