Cleaning Film Gate
The film gate (Figure 13) should be
cleaned at frequent
intervals.
Because
of the rapid stop-and-go
motion of the
film, particles of the emulsion lubricant
are eventually
rubbed off the edges of
the film and lodged on the gate; this
can damage film.
Use care in removing or replacing the
gate; force is not necessary.
To retract the pulldown claw, turn the
thread knob until its white line is toward
you. Remove the.projection
lens.
Open the gate and insert a clean
CARD
or piece of paper to protect the polished
surfaces of the gate; then withdraw the
gate.
Use a soft, damp, lintless cloth to clean
the gate. If necessary, wrap the cloth
around a toothpick
or matchstick
to
clean the film track.
To clean the aperture,
reach through
the projection-lens
holder with a small,
soft brush and dust off the edges of the
aperture.
Be careful not to chip off the
black coating on the edges.
Before replacing
the gate, make sure
the pulldown claw is retracted.
Then
guide the upper notched part of the
gate so that it bears against the under
part of the top hinge-retaining
SPRING.
Push in on the gate tab to engage the
top and bottom hinges.
.
16
CARD
GATE
SPRING
FIGURE 13
(
Cleaning Sound Optics
Cleaning Sound Drum
Occasional cleaning of the sound optics
is recommended.
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 condition,
remove the film and run the projector
in reverse.
Be su re that the power cord is not
plugged in. Remove the three master
control
COVER SCREWS
(Figure 14) and
the spacer that is on the screw nearest
the sound focus lever. Remove the
master control cover for access to the
sound optics and exciter lamp. With a
soft brush, dust the top and bottom
sound optics lenses. (Pull them out
slightly for easy access.) The
SOUND
PICKUP
(Figure 15) is just above the
upper lens and directly behind the
sound drum. The lower surface of this
pickup should be kept clean by using
a soft brush. Be sure the optics unit is
properly seated. Replace the master
control cover.
Oiling
All bearings are self-lubricating
and
require no oiling.
