Sanyo PLC-WK2500, Service Manual

Page: 32 / 112

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Electrical Adjustments
Gain adjustment [PC]
1. Enter the service mode.
2. 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
amplitude “
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
amplitude “
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
amplitude “
a
” to be minimum by changing the Data
value.
(a)
White Level
Pedestal adjustment [Component]
1. Enter the service mode.
2. Receive the 16-step grey scale 480i-component signal
with
Computer1 [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 lev-
el.
1. Enter the service mode.
2. Receive the 8 color 100% color bar 480i-component
signal with
Computer1 [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.
4. Auto Calibration adjustment [Component]
Below adjustments are performed when the above
auto calibration is failed.
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 lev-
el.
P
edestal Lebel
Blac
k Lebel
Gain adjustment [Component]
1. Enter the service mode.
2. Receive the 16-step grey scale 480i-component signal
with
Computer1 [Component]
mode.
3. Connect an oscilloscope to test point “
tP35G
” (+)
and chassis ground (-).
4. Select Group No. “
0
”, Item No. “
3
” and adjust the
amplitude “
a
” to be minimum by changing the Data
value.
(a)
White Level