Convergence Adjustment - Tatung OMNISCAN SERIES Service Manual

D. Adjust the purity magnet rings on the PCM
assembly to obtain a complete field of the color
red~
This is done by moving the two tabs in
suCh a manner that they advance in an opposite
direction but at the same time to obtain the same
angle between the two tabs, which should be
approximately 180 degrees.
F. Check the complete blue and complete green
patterns to observe their respective color purity.
Repeat steps A to 0 if needed.
R.B Static Convergence
r----purity _9n~h
Lock Ring
(Tum
coun~rdockwi'"
to unlock Convergence
& Purity M:IIgnet.l
Clamp
for Convergence
&
purity Magnet
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2.14 Convergence Adjustment
*
Before adjustment convergence,the vertical size,
linearity and focus adjustment must completed.
*
Make sure the Purity is good before the following
adjustment.
A.
Apply signal 89 (64 KHz), crosshatch pattern
(pattern 2).
B. The brightness level should be no higher than
necessary to obtain a clear pattern.
C. Loosen the convergence magnet lock ring,
converge the RED and BLUE lines at the center
of the screen by rotating the R-B static
Convergence Magent.
D. Align the converged RED/BLUE lines with the
GREEN lines at the center of the screen by
rotating the (R/B)-G Static Convergence Magnet.
E. Tighten the convergence magnet lock ring.
F. Remove the IY wedges and slightly tilt (do not
rotate) the deflection yoke horizontally and
vertically to obtain good overall convergence.
G. Secure the deflection yoke by re-inserting the
wedges.
H. Check convergence and Purity. If purity error is
found.
Please repeat the purity adjustment.
B/RG
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