Sanyo PLC-WK2500, Service Manual

Page: 33 / 112

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Electrical Adjustments
1. Enter the service mode.
2. Receive the 16-step grey scale composite video sig-
nal with
Video
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.
5. Auto Calibration adjustment [Video]
Gain adjustment [Video]
1. Enter the service mode.
2. Receive the 16-step grey scale composite video signal
with
Video
mode.
3. Connect an oscilloscope to test point “
tP35G
” (+)
and chassis ground (-).
4. Select Group No. “
20
”, Item No. “
0
” and adjust the
amplitude “
a
” to be minimum by changing the Data
value.
(a)
White Level
below adjustment is performed when the above auto
calibration is failed.
1. Enter the service mode.
2. Receive the 50%-Whole Gray computer signal with
Computer1 [rGB] mode.
3. Select Group No. “
100
”, Item No. “
92
” and change
data value to “
2
” to reduce the panel frequency.
4. Project only green light component to the screen.
5. Select Group No. “
101
”, Item No. “
1
” and change
data value to obtain the minimum flicker on the
screen.
6. Project only red light component to the screen.
7. Select Item No. “
0
” and change data value to obtain
the minimum flicker on the screen.
8. Project only blue light component to the screen.
9. Select Item No. “
2
and change data value to obtain
the minimum flicker on the screen.
10. Select Group No. “
100
”, Item No. “
92
” and change
data value to “
0
” to reset the panel frequency.
6. Common Center adjustment
1. Enter the service mode,
2. Receive the 16-step gray scale computer signal with
Computer1 [rGB]
mode.
3. Select Group No. “
100
” Item No. “
7
” (Red) or “
8
”
(Blue), and change Data values respectively to make
a proper white balance.
8. White Balance adjustment [PC]
Equipment Luminance meter
Input mode Computer 1 (RGB)
Input signal 100%-white and 50%-gray computer
signal
1. Enter the service mode.
2. Input the 100%-white computer signal and measure
luminance on the screen with the luminance meter.
It is
A for the reading of luminance meter.
3. Change the signal source to the 50%-white
computer signal.
4. Select Group No. “
100
”, Item No. “
6
” and change
the Data value to make the reading of luminance
meter to be
A x 22%.
7. 50% White adjustment [PC]
Adjustments item no. [3] to [5] are carried out at the
spare parts shipment in the factory, therefore they
are not required when the main board is replaced
with new one.