Cleaning Sound
Optics
Occasional cleaning of the sound op
tics is recommended.
Be sure that the power cord is not
plugged in. Remove the three.master
control
COVER SCREWS
(Figure 16)
and the spacer. Move the master con
trol all the way to the left. Swing the
master control cover outward for ac
cess to the sound optics and exciter
lamp. Move the
SOUND OPTICS
toward
the front of the projector with your
forefinger as shown in Figure 17 and
with a soft brush, dust the top and
bottom sound optics lenses. The
SOUND
PICK-UP
is just above the upper lens
and directly behind the sound drum.
The lower surface of this pick-up
should be kept clean by using a soft
brush. Be sure the optics unit is prop
erly seated. Replace the master con
trol cover.
FIGURE 16
COVER
SCREWS
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,.
..........
·�,
..
.
'"
11
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�j;
•
:or_ ��·�;·:.,,-.;•,..,
-
Cleaning Sound
Drum
The sound drum, sprocket-clamp roll
ers, and other rollers that come in
contact with the film should be wiped
occasionally with a soft, lintless cloth
to keep them clean. Dirt particles on
the inner edge of the sound drum will
interrupt the light beam and cause
blips and hum. To check for this con
dition, remove the film and run the
projector in reverse with the ampli
fier turned on.
FIGURE 17
SOUND
SOUND
OPTICS LENS
PICK·UP (TOP & BOITOM)
Oiling
All bearings are self-lubricating and
require no oiling.
17
