"James Sweet" wrote in message
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"Leonard Caillouet" wrote in message
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"Slim" wrote in message
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I have an Optoma EP 731 DMD video projector that died. The bulb doesn't
light. How do I test the bulb? An ohmeter across the leads reads
infinity. Is this normal?


It is open (burned out).

The lamp is high intensity discharge device and should normally read an
open circuit. You can check the lamp only on a known working ballast.
Does the projector have any diagnositcs? Most have an indicator to show
when the lamp fails.


Are you sure? It seems to be a halogen or metal halide type.


Metal halide = HID = high intensity discharge, this is *not* the same as
tungsten halogen which is just a fancy incandescent lamp. Two completely
different principals of operation. They both are made of quartz and
contain halide salts as part of the gas fill but that's where the
similarities end.

Thanks for the info. Still learning!