Example Of A Red On Blue Convergence Adjustment; Example Of Convergence Correction - Barco Galaxy NH-12 Installation Manual

3. Engine replacement
3.4.5.5

Example of convergence correction

Description
By default the convergence of the engine is well aligned in the factory. Only when replacing an engine, it might be needed to do a
convergence correction.
It is not easy to do a full convergence alignment. In most of the situations each of the steps of the procedure above must be repeated
a few times to come to a good convergence alignment.
In the example below three steps are needed to adjust red on blue.
Example
Image 3-94

Example of a red on blue convergence adjustment

In the first image, it can be seen that the red cross must be shifted left and must be rotated counterclockwise to match the blue
reference. Shifting left is not possible in one step, so three steps will be needed to perform the full alignment:
• shift the red image up-left first (controls 2B and 3B)
• then shift the red image down-left (control 1A)
• finally rotate image counterclockwise (controls 2A and 3B)
3
A
3
B
Image 3-95
46
2
A
1
B
2
B
1
A
1
A
2 3
+
A A
2 3
3
+
B A A
R59770591 ENGINE KIT 26/08/2010
1
B
2 3
+
B B
2 3
3
+
A B A