Chapter 3---Service Adjustments
12. Repeat Steps 6-11 until the spacer balls stay in focus through
the entire zoom range. The spacer balls may go slightly out of
focus in spots while zooming up or down, but they should be in
focus at the smallest and largest images.
13. Tighten the hex bolts on the Green
ILA
®
Assembly and the
wing nut on the Green Relay Lens.
14. Repeat Steps 6-11 above for any other assembly needing
ILA
®
Back Focusing. Be sure to hide the other 2 colors.
NOTE:
The CRT Mechanical Focus procedure (
Section 3.5
) is often
performed sequentially with the CRT Rotation procedure (
Section 3.6
). The
same two set screws (
Figure 3-5
) are loosened when doing either of these
procedures. When performing the procedures in sequence, ensure the two set
screws are secured when either the focus lock screw
or
the CRT thumbscrew
is tightened after finishing each adjustment.
Do not
leave the set screws loose
when securing either the focus lock screw or the CRT thumbscrew.
Turning
either one of these adjustments while the set screws are loose may
cause the CRT to go out of focus or rotate.
3.5 CRT Mechanical Focus
The CRT Mechanical focus is factory-set and will not normally
require adjustment. When a CRT is replaced, the CRT mechanical
focus must be reset. Adjust colors individually. After completing,
recheck other colors for additional adjustment. Replacing the CRT
could cause other colors to become misadjusted. Use the Focus
test pattern (an external signal or other test patterns can also be
used) for adjustment.
To adjust the CRT Mechanical Focus:
1. Remove the rear cover (
Section 4.2
)
2. Tilt the Electronic Module to the full up position (
Section 3.3
).
3. Select the Focus test pattern.
3. Zoom the Projection Lens to the widest angle (largest image)
and adjust the Projection Lens focus for the sharpest image of
the Focus test pattern.
4. Tilt up the Electronic Module (
Section 3.3
).
5. Loosen the two set screws (Figure 3-5) near the top of the CRT
sleeve.
6. Loosen the CRT focus lock screw located on the Guide Plate at
the top of the CRT shield (
Figure 3-5
). The CRT is now free to
slide.
7. Grasp the CRT thumbscrew (
Figure 3-5
) and slide the CRT
back and forth until the image is focused as sharply as possible
Model 220 Service Manual
3-7
Summary of Contents for 220
Page 1: ...SERVICE MANUAL Model 220 Projector ...
Page 10: ...Safety Information Model 220 Service Manual x ...
Page 14: ...Chapter 1 Introduction 1 4 Model 220 Service Manual ...
Page 119: ...Chapter 4 Maintenance Removal Replacement 4 26 Model 220 Service Manual ...
Page 129: ...Chapter 5 Troubleshooting 5 10 Model 220 Service Manual ...
