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98770 Adjustments 6-7
Raster Position
Two adjustments, horizontal and vertical centering (A44), are used to position the raster in the
center of the CRT screen.
The raster position adjustments are interactive with and affected by:
• Raster Size adjustments
• Raster Shape adjustments
• Purity adjustment
These adjustments should be performed after the initial raster position adjustment; then,
recheck the raster position and readjust as necessary.
Set the switch on the A13 (A33, A53, or A54) assembly to the rear to display a full white alpha
raster.
Procedure
1. Center the raster horizontally with the horizontal center control.
2. Center the raster vertically with the vertical center control.
3. Touch up convergence as necessary (see CONVERGENCE, page 6-6).
4. Check and perform, if necessary, the raster size, raster shape and purity adjustments.
Raster Size
Two adjustments, raster width and raster height are used to dimension the raster to the proper
size.
You may have to readjust the raster position slightly after sizing.
Set the switch on the A13 (A33, A53, A54) assembly to the rear to display a full white alpha
raster.
Procedure
1. Adjust the raster width and height so that the displayed raster is the same size as shown in
drawing.
2. Adjust the raster shape and readjust the raster position as necessary.
19. ,cm
L127xm
25.5cm
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