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1.7
Lenses
A lens inserts into the lens mount and is secured with a simple locking lever. It is important to remember that a
lens seals the projector. If the lens is missing when power is supplied to the unit, unfiltered air will be drawn in
through the lens opening and into the front area of the projection head, potentially depositing dust and dirt on
components in the light engine and optics. The attachment of the three-plate lens mount is offset by jack
screws spaced as far apart as possible to provide solid leverage and accurate adjustment of boresight. Good
boresight ensures alignment of the lens to the light engine and prism. See the D4K25 User Manual (P/N: 020-
100882-XX) for all other lens installation details, the boresight adjustment procedure at the screen, and lens
specifications.
D4K25 Service Manual
020-100880-01 Rev. 1 (06-2012)
Never apply power to the projector unless the lens is installed.
Section 1: Introduction
1-7
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