Section
2
Display Systems
2-5
2.5 Optical
Alignment
Optical alignment is required when the throw distance changes or the projector cannot be focused using the focus
controls. The projector is optically aligned at the factory at a fixed screen size and a fixed projector-to-screen
distance. If the throw distance has changed since the last setup, proceed as follows:
Note:
The projector must be warmed up for at least 45 minutes prior to performing optical alignment.
Note:
Optical alignment is both a mechanical and electrical adjustment. Electrical adjustments are stored in
the current setup memory. After alignment is complete, setup memories which were previously set up
(if any) must be set up again. Memory setup is explained in Section 2.7.
Note:
Factory alignment is performed using the internal crosshatch with a 61.8 kHz signal applied.
It is recommended that optical alignment be performed using
the projector's Guided Mechanical Setup tutorial. This tutorial
displays step-by-step instructions during the alignment. The
instructions in this section require use of the Guided
Mechanical Setup tutorial.
To access and use the Guided Mechanical Setup tutorial, turn
on the projector [
POWER
] then press [
HELP
] at presentation
level. The Help menu is displayed. Next press [
2
] to select
Guided Mechanical Setup. The first page of the guide will be
displayed on the projection screen. When using the guide,
press [
HELP
] to display the next page, press [
RECALL
] to
display the previous page. When complete, press [
EXIT
] to
end Help.
Examine the lens and hardware as shown in Figure 2-6. The
lens consists of a single focus barrel. The lens is secured in
place with a lens locking ring. Additionally, the lens consists of
a metal lens cover which is screwed in-place. To remove the
lens cover, rotate the cover counterclockwise (CCW) and place
in a secure location for reuse. To focus the lens, loosen the
lens locking ring. Note; the lens locking ring employs fine
threads and requires multiple turns. Once loosen, rotate the
lens barrel until the desired focus is achieved.
LENS LOCKING
RING
LENS COVER
1. Guided Source Setup
2. Guided Mechanical Setup
3. Source Selection Guide
4. Keypad Guide
5. -
6. Using Help
For all menus:
Press a number or use
then <ENTER> to select item.
<HELP> for assistance
<RECALL> to go back one level
<EXIT> to return to picture
HELP
The CRT is attached to its lens by four (4)
socket head Allen screws located on the lens
mounting plate. The upper right screw (when
facing the lens) adjusts the focus between the
top and bottom of the picture, and the lower
left screw adjusts the focus between the left
and right sides of the picture. See Figure 2-6.
Lens Mounting
Plate
Top/Bottom
Focus Adjust
Left/Right
Focus Adjust
Factory/Service
Adjust Only
Figure 2-6. 8521 Lens Assembly
Step 1.
Loosen the lens locking ring. Rotate the lens using until the picture is focused. Tighten the
locking ring.
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