Kodak 750 Manual page 15

CLEANING
The optical system of your projector must be kept clean if it
is to continue to give the best results. Dust or fingerprints
on the lenses will reduce the brightness of the picture on the
screen and will cause it to appear unsharp or flat.
Projection Lens-
Turn the focus knob until the lens is out as
far as it will go. Carefully push the focus knob toward the
side of the projector; at the same time, withdraw the projec-
tion lens. With a soft, clean, lintless cloth or KODAK Lens
Cleaning Paper, wipe the front and back surfaces of the lens.
Replace the lens by again pushing the knob toward the
side of the projector and guiding the lens back into position .
The lens should be far enough into its recess that the gear
teeth on the side of the lens barrel will be engaged by the
gear on the focus-knob shaft.
Condenser Optics-
Turn the projector bottom side up. Open
the lamp door as described on page 14. Carefully lift out
the condenser lenses and the heat-absorbing glass, one at
a time. Clean both sides of the condenser lenses and heat-
absorbing glass with a clean, soft, lintless cloth or KODAK
Lens Cleaning Paper. Be careful not to leave fingerprints on
the elements. Replace the condenser lenses and heat-
absorbing glass. The small condenser lens fits in the guides
nearest the projection lamp, with the flat side of the con-
denser toward the lamp. The heat-absorbing glass fits in
the center guides, and the large condenser lens fits in the
guides nearest the front of the projector with the flat side
of the condenser away from the lamp. Close and secure
the lamp door.
OILING
All bearings are self-lubricating and require no oiling.
Emergency Slide-Tray Removal-If the slide-changing
mechanism should become inoperative because of a defec-
tive slide, foreign object, etc, turn the coin-slotted TRAY
REMOVAL SCREW in either direction, as far as it will go,
to retract the tray lock. While holding the screw in this
position, lift off the slide tray. Because the slide tray has
been removed in this manner, the lock on the bottom of the
tray is no longer engaged by the notch in the metal slide-
retainer, as illustrated on page 8. With the tray placed up-
side down, turn the retainer until the lock engages the notch
in the retainer; then remove the defective slide from the
projector by pushing the select bar, or if necessary, pull the
slide from the gate by hand. Replace the tray on the projector.
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