Kodak 560 - Manual (Page 20)

Slide burning and picture flicker are problems common to Xenon projec-
tors. The following is an explanation and remedy for these problems
which can occur in any Xenon projector that is not adjusted properly.
1. Both problems, slide burning and picture flicker, are usually caused
by the same thing
–
a misalignment of the Xenon lamp position.
2. If the slide or the slide mount is burning, this is definitely caused by
a misalignment of the Xenon lamp position.
3. The flickering is caused by the physical nature of the Xenon lamp
itself. Navitar has incorporated a magnet assembly above the lamp
to solve this problem.
Before you try to fix either problem caused by misalignment of the Xenon
lamp, please read the sections “Installing a New Lamp” and “Adjusting
the Lamp Position.”
Proper adjustment of the three external lamp adjustments will provide a
brilliant and uniform illumination without any hot spots on the screen.
When this adjustment is done properly, the flickering may correct itself.
The Xenon lamp contains two probes inside a quartz envelope contain-
ing Xenon gas. When a very high current and voltage is introduced
across these probes, the Xenon gas is ionized and an arc of light is
produced between the probes. Within the envelope, there are some
heavier ions which will jump back and forth between the brilliant light
path between the probes. This jumping of heavier ions is what produces
the flickering.
Your Navitar Xenon projector has a built-in magnet assembly which is
placed across the ellipsoid mirror in the lamp area. This pulls the
heavier particles (ions) to one side so that their path is in step with the
main stream of light, stopping the flicker.
This means that if the lamp positioning is not correct, the lamp may have
been pulled away from the magnetic force that draws these heavy
particles to the main stream of particles. Therefore proper lamp adjust-
ment for even illumination and brilliance should fix both of these prob-
lems.
Explanation & Remedy
Lamp Adjustment
Solution
Slide Burning & Picture Flicker
18