Well, I had a good one today and perhaps someone else has run across this before.
Irem G3-X75 p.s. in a Xetron XCND console w/ P35GP projector.
Bad strobe on screen...normally a missing phase or open diode.
I immediately saw a terminal burned off the line side of the contactor. I cut the wire back to a good section and rewired with a new contactor. Problem still present. Checked the line side and load side of the contactor...118V to ground and 206V across phases. Diode? Checked all diodes...ok. Well, sometimes a diode will fail under load but test ok...so I replaced all six with six new diodes. Problem still present. Changed the bulb (you never know). Problem still present. No load voltage is about 98V and load is about 23V. I can easily bring the amps up to 82A. All of the tranformer outputs to the bridge test close in volts and amps. I tested and tightened all connections on the p.s. and up to the lamp. The large capacitor measures about 95V with no load and takes several minutes to discharge. I also checked the projector because I was running out of ideas...it appears to be running at the correct speed and the shutter is not damaged and is properly timed.
I would have changed the diodes again but I only have two more spares.
I am getting a little stumped. I called Neumade and they suggested the things I had already tried. I would have called Big Sky but it was too late.
I would greatly appeciate any suggestions. Thanks!
You tried everything I would have tried.
Just wondering about the burnt wire on the line side of the contactor. How come? I know Irem is not famous for over-tight connections, but just wondering why that phase, is it possible something else down the path drew an unusually high current?
Have you tried checking the continutity of the transformer windings, (pain in the ass, I know, but that is the only thing that comes to mind, other than a burned connection underneath the input lug, which I'm sure you would have checked.
Good luck, and please let us know what it was.
With the contactor engaged, you may be getting a "back-feed" through the transformer windings giving you a false indication of voltage where there actually is none.
In other words, have you tried checking incoming voltage on the input side of the unenergized contactor?
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