9600 Service Manual - gmecorp-usa.com

Video Control 13
CONTRAST AND BRIGHTNESS ADJUSTMENT
NOTE: Set up the monitor contrast and brightness in normal room light conditions
1. Turn off AUTO HISTO & WINDOW / LEVEL.
2. Display the video test pattern by pressing the TEST PATTERN button on the
keyboard and then pressing the LR button on the front of the Control Panel.
3. Adjust contrast and brightness pots R1 - R4 to minimum.
4. Adjust brightness pots R1 & R3, until the raster lines on both monitors are barely
visible.
5. Adjust the contrast pots R2 & R4, so that all step in the gray scale test pattern can
be seen without causing the white areas of the test pattern to bloom.
Figure 3 - Gray Scale Test Pattern
There should be no bleeding
of the white part of the image.
Look here to check for excessive
contrast pot adjustment.
All steps in the gray
scale should be visable.