housing. Clean the outside surfaces of the lenses
as described above and then replace the carriage.
P R O J E C T I O N L A M P R E P L A C E -
MENT.To replace the projection lamp, turn
off the projector and disconnect the power cord.
Allow the upper portion of the lamp house to
cool before handling it. Remove the lamp house
cover. If the projector has a lamp ejector lever,
lift the lever gently to release the lamp from the
socket. Remove the lamp by hand. If the lamp is
hot, use a glove or cloth. The base of a projec-
tion lamp is designed with either flanges or
prongs to hold it in position. To remove lamps
equipped with flanges, press the lamp down
firmly, turn it counterclockwise 90°, and lift it
out. For the lamps equipped with prongs, pull
the lamp straight out.
Replace the burned-out lamp with a lamp of
the same wattage and type. Remember to have a
spare bulb available.
To install a new projection lamp with
flanges, line up the wide and narrow flanges on
the base of the lamp with the corresponding
lamp socket slots and insert the lamp with the
socket. Press the lamp down firmly and turn in a
clockwise direction until it locks in place. To
install a projection lamp with prongs, set the
new lamp into the socket and rotate it slowly
until the prongs settle into the proper recep-
tacles. The lamp will fit only one way.
Try not to get fingerprints on the projection
lamp, but if there are any prints on the lamp,
wipe them off. Fingerprints on the lamp reduce
the light output and cause the bulb to get too hot
in the area of the fingerprint. This causes this
area to expand and may possibly cause the lamp
After installing a new lamp, always project
the light on the screen and focus the image of the
aperture. If the light distribution is uneven,
adjust the position of the lamp as directed by the
operation manual or technical order for the
When the appropriate projection lamp has
been installed, reassemble the lamp house cover.
EXCITER LAMP.Generally, the exciter
lamp cover and the exciter lamp can be easily
removed and replaced without the use of tools.
The exciter lamp cover acts as a dampening
shield which covers the exciter completely except
on the side facing the sound lens. This cover
eliminates stray reflection within the exciter
lamp chamber and prevents any light, other than
the direct beam from the exciter lamp, from
entering the sound optical system.
To remove and replace the exciter lamp, first
turn the volume control switch to the OFF posi-
tion. Disconnect the power to the projector.
Then remove the exciter lamp cover by loosening
the thumbscrew until the cover can be lifted
from the projector. Note the location of the
registration pins that align the cover, as these
must be repositioned precisely to replace the
cover. Move the exciter lamp release and locking
lever to its extreme right-hand position. This
releases the registration pins and permits the
lamp to be lifted from the socket. Clean the
exciter lamp with a clean cloth or lens tissue.
Avoid leaving fingerprints.
The sound lens is partially exposed when the
exciter lamp cover is off. Clean the sound lens,
with one face exposed toward the exciter lamp
and the other face exposed toward the sound
drum, by blowing air across the external surfaces
of the lamp with a syringe bulb. Remove any
remaining dust or dirt with a camels-hair brush;
then use a lens tissue to wipe the lens surface
clean. Do not attempt to move the sound lens
from the projector or disturb the setting of the
lens. Clean the external surfaces of the lens.
When installing a new exciter lamp, place the
lamp base openings over the appropriate
registration pins and turn the exciter lamp
release and locking ring to the extreme left-hand
position. This will seat the lamp firmly in place.
Wipe the exciter lamp with a clean cloth or with
lens cleaning tissue to remove fingerprints. The
exciter lamp is prefocused and no adjustment of
this lamp or its socket is required.
The exciter lamp cover may now be rein-
stalled. If the exciter lamp cover is designed with
registration pins, you must match the pins to
specific holes. Seat the cover firmly and hold it
in position while tightening the thumbscrew.
designed to use two drive belts. A takeup belt
drives the takeup reel during projection, a
rewind belt rotates the film reel on the feed reel