4-8
Chapter 4: Built-In Images
Model 801GC, 801GF & 801GX¥Rev. X1
BLU_PIC, GRAY_PIC, GRN_PIC, RED_PIC,
WHT_PIC, Flat, Flat Gray, Flat_B, Flat_G, and
Flat_R — contd.
Method
The methods used for adjusting purity on a color
monitor depend on the type of monitor and CRT
you’re using (for example; Delta, In-Line or Single
Gun). In most cases, the first step is to degauss
the CRT.
Note – For a Delta Gun CRT, turn on only the Red output. A
solid uniform field of red should be displayed. If the color is
not uniform, adjust the yoke and the Purity Tabs assembly.
If purity cannot be corrected to acceptable limits,
the monitor may not have been properly degaussed
or there may be a defect in the CRT or purity
assembly.
Test
Shadow mask warping
Purpose
The purity characteristics of your CRT can change
over time if you leave it on with a lot of video
being displayed. This may be due to the CRT’s
electron beams striking its shadow mask with
enough energy to cause the mask to heat. This
internal heating may be enough to cause the
shadow mask to warp and give bad purity.
Method
Set the purity image to white and allow the monitor
to run for a few minutes. Any mask warping shows
up as a change in purity. You can use a color
meter to measure the change. The BriteBox pattern
also may be useful for measuring shadow mask
warping.
Summary of Contents for 801GC, 801GF, 801GX
Page 1: ...Owner s and Programmer s Manual Model 801GC 801GF 801GX Portable Video Signal Generators ...
Page 16: ...xiv Table of Contents Models 801GC 801GF 801GX Rev A Notes ...
Page 17: ...1 1 Features Product Overview Chapter 1 Introduction ...
Page 21: ...2 1 Operating Modes Displays Indicators Knobs Switches Buttons Chapter 2 Basic Operation ...
Page 31: ...3 1 Introduction Format charts Chapter 3 Built In Formats ...
Page 39: ...4 1 Description of the test images and how to use them Chapter 4 Built In Images ...
Page 126: ...5 14 Chapter 5 Making Connections Model 801GC 801GF 801GX Rev A Notes ...
Page 304: ...6 178 Chapter 6 Programming Model 801GC 801GF 801GX Rev A Notes ...
Page 305: ...7 1 Power on Computer Interfacing If all else fails Chapter 7 Troubleshooting ...
Page 346: ...A 6 Appendix A Specifications Model 801GC 801GF 801GX Rev A Notes ...
Page 355: ...Notes ...