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I have an old Apollo Quantum 2521 Overhead Projector. The lamp is working, but it is creating a rainbow effect on the screen. Can you provide some help? Thankyou.

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RBE or the RainBow Effect is a common phenomenon experienced by most projectors - generally worsens over time because of slower moving parts inside projector - by the sound of it the color wheel inside your projector could well be slowing down but this effect is quite common and in some people more than others...
Projectors Rainbow Effect What Causes It And How It Affects You

Heres an example of how it can look....
I have an old Apollo Quantum 2521 Overhead Project - 33-h2jr1tg5ljmmha1nbvyr2fkr-5-0.png

Posted on May 07, 2017

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Posted on Jan 02, 2017

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It sounds as though the unit is overheating. That would explain why the fan keeps running, and once it cools down enough it starts up again. What kind of environment are you running this in? Is there a way to put it in a cooler environment? Even having an external fan blowing on the unit could help. Honestly, unless you've got it in a very hot environment, it also sounds like a poor design for heat dissipation. Or possibly the heat sensor is bad, and shutting it down at a lower temperature than it should.

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