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OPEN THE BOOMERANG ACCESS COVER and verify that the round glass heat filter
and ring assembly (Figure 5, Item 17) is installed into the bracket mounted to the fadeout and douser support
housing. NOTE: The followspot should never be operated with this heat filter removed.
REMOVE THE PLASTIC COVER from the xenon bulb. DO NOT ignite the lamp with the
cover on the bulb. Store the cover for future re-use. Replace and secure the inner bulb enclosure covers.
CLOSE THE LAMPHOUSE COVER and secure using both latches. Turn on the main line
switch and/or circuit breaker to energize the xenon power supply. The spotlight blowers will start and operate
continuously until the xenon power supply is de-energized.
PLACE THE LAMP SWITCH in the "ON" position and the lamp will i gnite. Check the
reading on the lamphouse ammeter. Nominal current for the 4000/4500 watt xenon bulb is 135 amperes. If
using a lower wattage bulb, check the documentation packaged with the bulb for its current ratings. DO NOT,
AT ANY TIME, exceed maximum rated amperage. Output current is adjusted at the xenon power supply; see
power supply manual for instructions. Operation of a new bulb is normally started at the lower end of its
range, and current is gradually increased as the bulb ages to maintain light output. During the ignition cycle,
pressing the VOLTS/AMPS switch will briefly indicate the high "no load" (open circuit) DC voltage applied
to the xenon bulb for ignition.
OPEN THE REAR COVER above the instrument panel by loosening the (2) thumbscrews.
This exposes the bulb positioning controls in the lamphouse back casting. To focus the xenon bulb and obtain
the best light on the stage, the two methods outlined below are the most suitable.
MOVE THE SPOT SIZE CONTROL HANDLE (trombone) on the large lens carriage all the
way forward to project the smallest spot possible; place the iris, masking shutters (choppers) and the fadeout
douser blades in their full open positions. Project a spot to a wall or similar flat perpendicular surface opposite
the spot l ight position.
OPERATION
THE CENTER SECTION of the bulb
positioning controls is a threaded member that
focuses the bulb in relation to the reflector. Turning
this adjustment moves the bulb in only one plane,
into or away from the reflector. Turning this section
clockwise moves the arc away from the reflector.
The small knurled screw to the left of this section can
be tightened to lock the focusing mechanism after
the following procedures have been completed.
THE LARGE THUMB SCREWS, on
either side of the focusing control, lock the
horizontal and vertical adjustment mechanism
in position.
XG4/009
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