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Chapter 3 Service Adjustments
4. Select the Focus test pattern.
5. Select Projection Lens from the menu.
6. Use the up/down arrow keys to zoom the Projection Lens to full
telephoto position (smallest image). NOTE: Skip this step when
using an optional fixed lens.
7. Use left and right arrow keys to focus the projection lens to get
sharply focused spacer balls. NOTE 1: Spacer balls are used
inside the ILA
®
Assembly to separate the layers. They are tiny,
random, irregularly-shaped spots that are visible throughout the
image. Look directly in front of the screen in the lighter areas of
the image to view. From throw distances shorter than 4 meters,
spacer balls are difficult to see.
8. Zoom the lens to a wide angle position (largest image). NOTE:
Skip this step when using an optional fixed lens.
9. Put on safety gloves (see Safety section for gloves type) then
loosen the wing nut on the Green Relay Lens (or whichever
lens is being focused). NOTE: If the ILA
®
/Relay Lens/CRT
assembly cannot be moved close enough to get a good spacer
ball focus, loosen the CRT Lens Stopper Ring in front of the
CRT Holder Ring (Figure 3-5). Move the CRT snug against the
collar to get additional range, and then, retighten the collar.
10. Loosen the 2 hex bolts (Figure 4-12) on the ILA
®
assembly in
front of the Relay Lens.
11. Slide the Relay Lens/CRT/ILA
®
assembly forward or backward
until the sharpest spacer ball focus is achieved. NOTE: Do not
use the zoom lens focus while performing this step.
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 secure 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
3-6 Model 200 Service Manual