3M 2100, Руководство по обслуживанию

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MODEL 2100 OVERHEAD PROJECTOR
4-4
FOCUS MECHANISM
If the projection head does not hold its focus
position, you must adjust focus knob tension or
add focus kit (78-8054-1613-4 (gray), 78-8054-
1614-2 (charcoal).
To adjust:
Turn the Tension Screw counterclockwise to
tighten focus assembly. Turn clockwise if
binding occurs.
NOTE
Refocus the projector each time an
adjustment is made.
ALIGNING THE FRESNEL LENS
When replacing the Fresnel Lens, use the
following procedure:
A. Remove the Top Cover Assembly. (See
Section 2 - Cleaning Stage Glass and
Fresnel Lens, page 2-3)
B. Place the Top Cover Assembly upside
down on a flat, clean surface.
C. With the four (4) corner screws loosened,
stretch two rubber bands between
diagonally opposite screws, forming an
"X" pattern. (See Figure)
D. Center circle of Fresnel Lens should
exactly coincide with center of "X".
E. After centering, remove rubber bands one
at a time and retighten corner screws.
Aligning the Fresnel Lens