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LOOSEN the two thumb
screws, one on either side of the focusing sec-
tion, just enough to permit manual movement
of the complete assembly. The bulb adjustment
control will now move about these two thumb
screws, and as this control is shifted, the smooth
shadow of the electrode can be seen extending
beyond the projected hole in the reflector. The
electrode shadow must be centered inside the
projected hole of the reflector.
MOVE THIS CONTROL SECTION around the two thumb screws until the black
spot is as round as possible to project. It may be necessary to again adjust the focus control to define
a sharp spot. After the black spot is as even as possible to project, tighten the two thumb screws to
lock the adjustment section. This adjustment has now centered the projected image of the electrode
shadow and the hole in the reflector on the aperture and screen.
REPLACE THE PROJECTION LENS and rotate the focus adjustment until the
desired light distribution is projected to the screen. Avoid running the projector in this manner for an
extended period of time without frequently closing the lamphouse douser. Without film, the heat from
the xenon bulb can damage the projection lens.
THIS ADJUSTMENT should not be disturbed until it is necessary to replace or rotate
the xenon bulb. Then, only the bulb adjustments outlined above may have to be repeated; do not
disturb or adjust the optical alignment of the lamphouse on the projector table.
REPLACE THE REAR COVER PANEL over the bulb adjustment control mecha-
nism. Press plungers into grommets to secure.
BECAUSE OF MANUFACTURING TOLERANCES on the xenon bulb, and normal
aging, it may necessary to operate one lamp of a two-machine installation at slightly higher or lower
current to obtain equal light balance on the screen. This is done by adjusting the output of the xenon
power supply.
TO EXTINGUISH the arc, place the LAMP switch in the "OFF" position. The lamp-
house blower will continue to operate until the main switch in the AC power line to the xenon power
supply is opened.
TO PROLONG BULB LIFE, leave the blower and exhaust fan operate for at least ten
minutes after turning off the lamp. Allow the bulb to cool to room temperature before opening the
lamphouse access door for any reason.
A PERMANENT MAGNET is mounted behind the reflector to stabilize the arc
between the electrodes of the ignited bulb. The magnet requires no adjustment. If the magnet is
removed for any reason, it must be replaced with the SOUTH pole nearest the lamphouse access door.
The south pole is stamped "S" and marked with paint.
Support Yoke
Shadow
Reflector
Hole
Projection Lens removed
U80/012
Anode
Shadow
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