Calibrating and Adjusting

To adjust white balance

To adjust white balance

1Provide a blank display on the CRT.

From the Color Display Test menu, select a blank (colorless) raster.

2Preset the front panel brightness and contrast controls to their mechanical centers.

3On the bottom PC board, set the following adjustments to their mechanical centers.

SUB BRT (RV901)

SUB CONT (RV902)

4On the bottom PC board, set the following adjustments to their mechanical centers.

G. DRIVE (RV921)

B. DRIVE (RV931)

R. DRIVE (RV911)

5On the rear PC board, set the following adjustments fully counterclockwise.

G. BKG (RV721)

B. BKG (RV731)

R. BKG (RV711)

6Adjust the SCREEN (RV702) located on the rear PC board until either the red, green, or blue raster just starts to become visible. Note which color becomes visible first and do not adjust the background control (BKG) for that color in the next step.

7Adjust the other two background controls for the best white balance.

8From the Color Display Test menu, select the white raster test pattern.

9Set the front panel brightness control to maximum.

10On the bottom PC board, adjust the DRIVE controls (RV921, RV931 and RV911) for the best white balance.

For a white balance reference, use an average piece of white photocopy paper and compare the white on the CRT to the paper.

11Repeat steps 1-3 followed by 6-10 until satisfied with the white balance.

Essentially, from this point the procedure is as follows:

a With a blank screen, the front panel brightness set to center, and SCREEN (RV702) set for minimum background, adjust the BKG controls (G.-RV721, B.-RV731, and R.-RV711) for the best white balance.

b With a white raster and the front panel brightness set to maximum, adjust the DRIVE controls (G.-RV921, B.-RV931, and R.-RV911) for best white balance.

c Repeat until satisfied with the white balance.

12Replace the side and rear fans.

Refer to chapter 6, "Replacing Assemblies."

4–13

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HP 16500B manual To adjust white balance, Provide a blank display on the CRT, Replace the side and rear fans