Focus Voltage Adjustment Procedure - EDL Displays 6120 Operation And Maintenance Manual

FOCUS VOLTAGE ADJUSTMENT PROCEDURE

EQUIPMENT REQUIRED:
1. Astro Designs VG809 or equivalent that provides single pixel line or character
widths.
2. Insulated 1/4" straight screwdriver or adjustment tool.
3. BNC cables as required.
PROCEDURE:
1. This procedure requires removal of unit enclosure or top cover.
2. Connect three equal length BNC cables from the video generator or test source
RGB analog outputs to the Model 6115, Model 6116 or Model 6119 RGB video
inputs respectively.
3. Display a pattern such as dots or characters.
4. Observe "sharpness" of image at several locations on the screen.
5. With the insulated tool, adjust the "focus" pot on the top of the High Voltage Power
Supply for the best "average" sharpness across the screen. Since the Model 6115,
Model 6116 and Model 6119 does not have dynamic focus, it is not possible to get
a uniform sharpness of image across the screen. The variation is so slight that an
acceptable compromise is easily attained.
6. Should it be necessary to verify or adjust the anode voltage and/or the G2 voltage
the procedure in the Anode And G2 Voltage Adjustment Procedure section.
6115 - 6120 Operation and Maintenance Manual ©EDL Displays, Inc. January 1997
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