4-44
Chapter 4: Built-In Images
Model 801GC, 801GF & 801GX¥Rev. X1
Outline0 and Outline1 — contd.
Method
Measure the lengths of the two (2) diagonal lines.
Any difference is an indication of parallelogram
distortion. The difference in readings should be
within the specifications of the monitor.
If the difference in the readings is too far beyond
spec, the monitor should be rejected and sent back
for repair before the operator wastes time trying
to magnet a defective yoke.
Test
Trapezoid distortion correction
Purpose
This image gives you a way to measure trapezoid
distortion in your monitor. If the distortion isn’t
too severe, you may be able to correct it by adding
or adjusting magnets on the yoke.
Method
Perform the Yoke Winding Orthogonality Check and
Parallelogram Distortion Check tests first to prevent
an operator from wasting time on a monitor with
a defective yoke.
Measure the width of the image at the top and
bottom of the display. Any difference in readings
should be within the spec limits. Measure the
height of the image at both sides of the display.
Again, any difference in readings should be within
spec limits. If either of the differences is out of
spec, the trapezoid distortion of the monitor is
out of spec.
Add or adjust magnets on the yoke to correct the
problem. The Pin & Barrel Correction test should
be repeated to make sure that it’s still in spec.
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 ...