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Chapter 4---Maintenance (Removal/Replacement)
NOTE: When changing from a zoom to a fixed lens, or vice
versa, the ILA
®
Back Focus (Section 3.4) may need
readjustment.
4.18 Prism Assembly
CAUTION! The removal of the Prism Assembly
requires removing the Dichroic Mirror Assembly (X-Plate). In most
cases this necessitates an optical realignment. HJT does not
recommend performing this replacement in the field. Optical
alignment is critical and requires projector power to be on. This
results in an additional safety hazard due to the high intensity light
beam emanating from the optical area with the optical cover off. If
removal and replacement is absolutely necessary, proceed with
extreme caution and wear safety glasses.
The Prism Assembly requires the removal of more components and
assemblies than any of the other assemblies. Be sure to have
storage cabinets or tables to house the various items as they are
removed to provide access to the Prism Assembly. Allow about 3-4
hours to perform the removal and replacement of the Prism
Assembly. Refer to Figures 4-1 and 4-11 for the assemblies
referenced in this procedure.
To remove the Prism Assembly:
1. Remove front and rear covers (Section 4.2).
2. Remove the Optical Shield by removing the 3 screws
holding it.
3. Remove the Arc Lamp air filter and cover (3 screws).
4. Remove the Arc Lamp (Section 4.4).
5. Remove the Lamphouse Dock (Section 4.4).
6. Remove the lower right side panel (5 screws).
7. Remove the X-Plate (Dichroic Mirrors) assembly by
removing the four hex bolts securing it (see Figure 4-14).
CAUTION! Use care when lifting the mirror assembly.
Place it in a safe, level storage area.
Model 200 Service Manual 4-21