Color Adjustment - HP L1940 Service Manual

28 HP L1940
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White Balance Adjustment
Alignment procedure
1. Turn on HP L1940 LCD monitor.
2. Turn on the Timing/Pattern generator. See Fig. 1
Setting generator to provide CROSS-Hatch pattern at
Resolution :640*480
Timing : H= 31.47kHz V= 60 Hz
3. Preset LCD colour Analyzer CA-110
- Remove the lens protective cover of probe CA-A30.
- Set Measuring/viewing selector to Measuring position for reset
analyzer. (Zero calibration) as Fig. 2
- Turn on the colour analyzer (CA-110).
- Press 0-CAL button to starting reset analyzer. See Fig. 3
Fig. 1
0-CAL
Fig. 3
4. Entering factory adjustment mode of LCD Monitor.
- Power off the monitor,To hold "Auto Adjust" And" +(plus)"
buttons at the same time , And press "Power" button to
power on the monitor. Press "Menu" button to bring up OSD
MENU for confimation.
Note: after alignment, please reset OSD to user s mode for normal
operation. Otherwise, the monitor won t entering power saving mode
and showing full white picture all the time as no video signal supplied.
To leave factory mode by restart the monitor.
5. Adjust OSD menu to lower position of screen (i.g. adjust V-position to
value " 0 " at submenu of OSD Setting.
6. Setting Brightness and Contrast
- Adjust Brightness to value " 90".
- Adjust Contrast to value " 80" .
7. Switch light probe to Viewing position.
8. Move the Lens barrel forward or backward to get clear image as
shown in Fig. 4
9. Switch light probe to Measuring position. It should be able to indicate

Color Adjustment

Measurement/viewing selector
10. Setting pattern to full white picture.
11. Press "menu" then select F,by "plus"button.
12. Press "menu"to bring up submenu as following windows.
Cover(black)
Fig. 2
Measurement viewing selector Measurement viewing selector
9300° K
13.
6500 °K
14. Setting X, Y value listed as below:
Alignment hits: 1. R for x value, G for y value, B for Y value on the
15. Gray scale checking
Factory Mode Indicator
Note: The bright scale will be saturated, if Y is too large. The dark scale
Press MENU buttons to select R G B. Increase/decrease value
by press or buttons until the X, Y co-ordinates as below:
X= 0.283+/- 0.020
Y= 0.297 +/-0.020
Y>= 200 nits
X= 0.313 +/-0.020
Y= 0.329 +/-0.020
Y>= 200 nits
colour analyzer.
2. If the colour analyzer has been calibrated and preset
colour temperature in it. Please switch to correct
setting in accordance with colour settings.
- Switch Timing/pattern generator to
Pattern: 64 gray scale
Timing: 640 X 480 60Hz 31.47 KHz
- Setting both Brightness 90% and Contrast to 80% (Value).
- Check black and white scale are visible clearly across the screen.
See Fig. 5
Fig. 5
will be invisible, if Y is too small. Re-alignment or review
procedure again to correct this.
Clear image
Fig. 4