JVC 250 - Manual (Page 52)

Chapter 4---Optical
Model 250 Service Manual 4-19
8. Loosen the two hex bolts (see Figure 4-10) on the ILA
®
assembly in front
of the Relay Lens.
9. Slide the Relay ILA
®
/Lens/CRT assembly forward or backward to achieve
the sharpest spacer ball focus.
NOTE: Do not use the projection lens focus while performing this step.
10. Tighten the hex bolts on the Green ILA
®
Assembly and the wing nut on
the Green Relay Lens.
11. Repeat Steps 7-10 above for other colors that need ILA
®
Back Focusing.
Be sure to hide the other two colors.
ILA
®
Remove and Replace
Each projector has three ILA
®
s; each located on the front of a Relay Lens.
Tools Needed
4-mm Hex wrench
Parts Needed
Super Contrast
Blue 102630-14
Green 102630-15
Red 102630-16
NOTE: Do not interchange Super Contrast ILA
®
s. The Compensators on the
ILA
®
s are color specific and can not be interchanged i.e. the green ILA
®
can not
be put in the red channel or blue channel.
To Remove the ILA
®
1. It is not necessary to power off the projector.
2. Remove the Rear cover. It is not necessary to tilt the Electronics Module
up.
3. Loosen the two Hex nuts using a 4-mm Hex nut wrench and slide the
ILA
®
/Relay Lens/CRT Assembly back.
4. Loosen the two wing nuts on the ILA
®
and pull back the spring clip.
5. Disconnect the connector from the ILA
®
and remove the ILA
®
assembly
(it will slide out with some resistance).
It will be necessary to reset ILA
®
bias, and Overlap. ILA
®
Compensator, G
2
setting, and shading for the ILA
®
being replaced should be checked.