White Balance, Luminance Adjustment - Dell W2607C Service Manual

7. White Balance, Luminance Adjustment

Approximately 30 minutes should be allowed for warm up before proceeding white balance
adjustment.
Before started adjust white balance, please set the Chroma-7120 MEM. Channel 3 to Natural colors, MEM.
Channel 4 to 6500K color, MEM. Channel 9 to 9300K colors and MEM. Channel 10 to 5700K colors (Nature
parameter is x =289 ± 30, y = 304 ±30, 6500 parameter is x = 313 ± 30, y = 329 ± 30, 9300 parameter is x = 283 ±
30, y = 297 ± 30,5700 parameter is x = 328 ± 30, y = 344 ± 30),
The data of Y of all the mode is PC>300,AV>400,S-Video>400,Component>400cd/m2.
Devices Requirement:
1. Chroma 7120, Chroma 2327.
2. AV/S-Video/Component signal generator
How to setting MEM.channel you can reference to Chroma-7120 user guide or simple use " SC" key and " NEXT"
key to modify x, y, Y value and use "ID" key to modify the TEXT description
Following is the procedure to do white-balance adjust
˙After there is no OSD pictures on screen ,Press Number key
access into the factory mode.
˙In the factory mode ,the menu as follows:
5700K
6500K
9300K
NATURAL
NVRAM Init
Burn in mode【On/OFF】
The steps of the PC W/B adjustment as follows:
I. Initial the EEPROM
Press "NVRAM Init: Press 【OK】to start" to initial EEPROM.
Bias (Low luminance) adjustment:
Prepare: ensure the currently mode is PC (VGA)
Press "Auto Balance" button (the image is black and white at the PAT42)
II. Gain adjustment:
1. Switch the chroma-7120 to RGB-mode (with press "MODE" button)
2. Let the signal output the white image (press pattern 105), select one of the color temp (as Natural、6500K、
9300K、5700K) and adjust factoty mode window R、G、B until up to the value Chroma7120 R, G, B=100±3.
3. Select another color temp and follows as item 2.
The steps of the AV W/B adjustment as follows:
Ⅲ
The steps of AV W/B adjustment as follows:
Gain adjustment:
1. Switch the chroma-7120 to RGB-mode (with press "MODE" button)
2. Let the signal output the white image (press pattern 105), select one of the color temp (as Natural、6500K、
9300K、5700K) and adjust factoty mode window R、G、B until up to the value Chroma7120 R, G, B=100±3.
3. Select another color temp and follows as item 2.
Ⅳ The steps of the SV(S-Video) W/B adjustment as follows:
The steps of SV's W/B adjustment is the same as AV's.
Ⅴ The steps of the CP(component) W/B adjustment as follows:
The steps of CP's W/B adjustment as same as PC's.
Press MENU button to quit from factory mode.
R、G、B
R、G、B the data is the result of R、G、B after
R、G、B W/B adjustment;
R、G、B
Initial EEPROM
2—4—8—6—MENU—INFO
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