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For arc lamp luminaires, heads should be tilted horizontal before starting lamps. Lamps generate
light by an electrical discharge arc, whereby the electrons from two electrodes excite the fill
components to give off light. Because of the alternating current "position", the electrons are
alternately given off by the two electrodes. When a lamp is set in a vertical position, the halogen-
metal compounds, which determine the color temperature of the lamp, collect at the top end of the
glass envelope. When the lamp is started, color deviations occur since the concentration of halogen
compounds is greater around the top electrode than the bottom electrode. In addition, the fill
components that are difficult to vaporize congeal around the bottom electrode, thereby reducing
lamp life.
Solid State Electronics
Electrostatic Discharge (ESD)
Electrostatic discharge (ESD) presents a significant danger to solid state electronic components
(semiconductor devices and PC board assemblies). Static electricity can build on a variety of common
objects (including people) simply by handling or moving. ESD rarely results in immediate failure of a
component, but shows up later as an intermittent problem or severely reduces the life of the
component. All VARI❋LITE equipment uses solid state electronics and appropriate precautions to
protect them should be observed when servicing.
Printed Circuit Boards (PCBs)
All PC boards should be shipped in electrostatic shielding bags. When handling PC boards or
components, devices such as conductive mats and conductive wrist straps should be used whenever
possible. If these precautionary devices are not available, handling of PC boards and components
should be avoided.
CAUTION: Black foam (used to package solid state electronics) should never be used for packing
batteries or put in contact with PC boards which contain batteries.
02.96 83.000 1 0
T
ROUBLESHOOTING AND
16 No vemb er 2010
A
M
AINTENANCE
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