12. Servicing
Convergence test pattern
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Image 12-6
The test pattern illustrated abov e is specially
designed for convergence purposes. The test pattern has three red arrows numbered
from 1 to 3 and three green arrows num bered from 4 to 6. These numb ers and colors c orrespond w ith the number s and colors of
the e xtended control kn obs (image 12-5). T he direction of the arrow shows the m ovem ent of the c hannel color (red or green) when
turning the corresponding knob in t
he direction indicated by the arrow m arked on the knob.
The three convergence control knobs of one channel stand in relation with each other. So, a change to one
of them will also effect the adjustment results of the two others. Therefore, all three control knobs have to
be alternately and repeatedly adjusted until the projected color is perfectly converged with the blue reference
color of the test pattern.
Adjustment range
• The adjustment range is limited to approximately 30 pixels in both directions.
• One turn (360°) of a c ontrol knob relates to an approximately 30 pixel displacement on the screen.
• When changing the adjustment d irection there w ill be some play of approximately one turn (360°).
R59770091 DP-1500 06/01/2009
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