Zenith PRO895X - Manual (Page 22)

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Verify spot alignment by rotating Green electrical focus slightly
clock-wise to counter clock-wise. The Dot shape should not tail or
flair. The bright area should remain in the center of the haloed
area. Refer to the figure below.
If this test shows a need for astimatator alignment perform steps
“a” - “l” below.
Astigmatator Alignment Procedure
a. Set the display/sync mode to Forced Mode 6 (HDTV33) and
select a cross-hatch or dot pattern.
b. Cut off Red and Blue video or cover the CRT lens
assemblies.
c. Set Green electrical focus slightly CCW. This is to make a dot
near the display center dimly haloed with a bright center. The
haloed effect will also be visible with the cross-hatch lines.
d. Use the astigmatator 4-pole magnet to shape the halo and
bright spot as round as possible.
e. Use the astigmatator 6-pole magnet, if needed, to help shape
the halo and spot round.
f. Use the astigmatator 2-pole magnet (refer to the figure at
bottom left of this page) to center the bright spot within the
halo. You may also use an intersection, of the cross-hatch, to
center the bright area within the haloed area.
g. Use the main yoke magnets to position the signal raster center
to the CRT face center. Refer to figure below.
h. Verify spot alignment by rotating Green electrical focus slightly
CW to CCW. The Dot shape should not tail or flair. The bright
area should remain in the center of the haloed area.
i. Repeat steps “c” thru “h” as needed to obtain the smallest and
best round Green center dot with no shape flaring.
j. Adjust for the best electrical and mechanical focus.
k. Repeat steps “c” - “j” for the Red and Blue displays.
l. Exit forced mode 6 and return to normal video. Set
Brightness and Contrast to 50.
Note: The yoke adjustments should not be touched during the
remaining setup steps.
FOCUS PROCEDURE USING SPRING SYSTEM
Changing Preset 80 inch Width Image Screen Size
Note: The PRO895X is shipped preadjusted for an 80 inch project-
ed screen size image.
To set up a screen size other than 80 inch width, you must
remove the shims from each of the 3 lens assemblies.
Note: Remove AC Power. Be careful not to damage
the lens assembly or scratch the lens surface. The
lenses can be easily damaged during removal and
reinstallation.
1. Each 80 inch width image focus shim (shown below) can be
removed from each lens by first loosening and removing the 4-
lens mounting screws, in the order shown below.
2. Carefully remove the lens assembly, remove, and discard shim.
3. Reinstall lens using the screw installation sequence shown
above; hand-tighten the screws.
4. Follow the same procedure to remove the two remaining lens
shims.
5. Tighten and adjust the lens mounting screws following
the instructions described in the following section.
3. Ceiling/Front Projection Lens Angle Focus Alignment
If this PRO895X system is equipped with the “lens assembly
206-3634 P A G E 2 2
SYSTEM ALIGNMENT
1 3
4 2