Chapter 2 41
Making Adjustments
1b. Display (with eight access holes in top of shield)
Brightness and Contrast
Perform these adjustments only if the brightness and contrast of the
display is not correct.
The Brightness and Contrast potentiometers are accessible through the
top of the display's cover. The instrument cover must be removed for
access to the display's cover. Refer to Figure 2-4 for the locations of
these adjustments. Use the specified adjustment tool to make these
adjustments.The Brightness and Contrast potentiometers are
interactive adjustments.
1. Adjust the Contrast potentiometer to the full clockwise position (the
image is no longer displayed).
2. Adjust the front-panel INTEN knob to the full clockwise position.
3. Adjust the Bright potentiometer until the background is just barely
extinguished (the background is dark).
4. Adjust the front-panel INTEN knob to the full counter-clockwise
position.
5. Adjust the Contrast potentiometer until the image is just barely
extinguished.
6. Adjust the front-panel INTEN knob to the full clockwiseposition and
verify there is not background illumination. If necessary, re-adjust
brightness and contrast so that the front-panel INTEN will go from
a dark screen to a bright screen with a dark background.
7. Adjust the front-panel INTEN knob for comfortable brightness and
adjust the display focus.
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