Panasonic PT-TW230U Service Manual page 37

Electrical Adjustments
1. Fan voltage adjustment
Equipment Digital voltmeter
1. Enter the service mode.
2. Adjust the voltage on each test point by changing the
data values of Group-No.
Group - No. Test Points
250 - 0
K6W-4
250 - 1
K6W-4
250 - 2
K6W-3
250 - 3
K6W-3
250 - 4
K6W-2
250 - 5
K6W-2
2. Panel type check and setting
* Before setting, you need to check which type of LCD
panel is placed on the projector according to the item
"LCD panel/prism assy removal" in the chapter "Optical
Parts Disassembly".
1. Enter the service mode.
2. Panel Type Check
Select Group "290", No. "0". Check the data value as
follows;
Data value "0" : For L-Type of LCD Panel
Data value "20" : For R-Type of LCD panel
If the mounted LCD panel type and set Panel mode are
differ, take the step below.
3. Panel Type Mode Setting
Select Group "290", No. "1" and change the data value
from 10 to 0 or 20 depending on your LCD panel type.
When the data value reaches 0 or 20, it returns to 10
quickly. The gamma-characteristics changes accord-
ing to your selection.
Adjustments item no. [3] and [5] are carried out
at the spare parts shipment in the factory, there-
fore they are not required when the main board is
replaced with new one.
Adjustment value
4.5±0.1Vdc
13.5±0.1Vdc
5.0±0.1Vdc
13.5±0.1Vdc
5.0±0.1Vdc
13.5±0.1Vdc
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3. Auto calibration adjustment [PC]
Input mode Computer 1 (RGB)
Input signal XGA Computer signal
Signal pattern 16-step gray scale
1. Enter the service mode.
260
2. Select Group " ", No. "
1
to " ".
The projector begins auto-calibration and then
will appear on the screen.
Below adjustments are performed when the above auto
calibration is failed.
Pedestal adjustment [PC]
Equipment Oscilloscope
1. Enter the service mode.
2. Adjust the black level on each test point to be minimum
by changing the data value of Group - No.
Group - No. Test Points
0 - 0 TP35G
0 - 1 TP35R
0 - 2 TP35B
Gain adjustment [PC]
Equipment Oscilloscope
1. Enter the service mode.
2. Adjust the amplitude "
point to be minimum by changing the data value of
Group - No.
Group - No. Test Points
0 - 3 TP35G
0 - 4 TP35R
0 - 5 TP35B
White Level
(a)
0
" and set the data value
"OK"
a
" of waveform at each test