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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.