Hughes JVC 100, Service Manual

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Chapter 3---Service Adjustments
3-10 Model 100 Service Manual
visible (looks like pepper spray) throughout the image. Stand directly in
front of the screen and look in the white areas of the image. From throw
distances shorter than 4 meters, spacer balls are difficult to see.
7. Zoom the lens to the largest image.
8. Put on safety gloves (see Safety section for gloves type) then loosen the 2
Phillips screws on the Green ILA
®
Assembly base (or whichever lens is
being focused).
9. Stick a small flat-blade screwdriver in the adjustment slot and move the
ILA
®
Assembly back and forth until the spacer balls are in focus (see
Figure 3-7).
NOTE: Do not use the zoom lens focus while performing this step.
Figure 3-7
ILA
®
Back Focus Adjustment.
10. Repeat Steps 5-9 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.
11. Tighten the 2 phillips on the Green ILA
®
Assembly (see Figure 3-7).
12. Once the Green ILA
®
is properly focused, loosen the 2 ILA
®
screws for the
Red Channel. Move the ILA
®
back and forth until the Red Channel
spacerballs are in focus.
13. Repeat Step 12 for the Blue ILA
®
.
To adjust the ILA
®
Back Focus for a Fixed Lens:
1. Remove all the covers (see Section 4.2).
2. View the Green Channels. Hide the Red and Blue Channels.
3. Select Test Pattern #7 (the Pluge/grey test pattern).
Adjustment Slot
Insert flat-blade
screwdriver here
Loosen these
screws (one on
other side of
ILA
®
Assembly)