Question about InFocus LP 735 Multimedia Projector
After powering up, the unit will run for about 45 seconds and cycle off for about 45 sec, then back on and continues this pattern. When it shuts down, the power led goes from steady green to flashing green and back to steady 45 sec later. The lamp PCB power supply (front right corner) does not loose its input voltage (380 Vdc). There is a spark gap on the board that when voltage across it reaches about 284 Vdc, the system cycles on & off at 45 sec intervals. I thought the spark gap was firing but not sure. I researched the part (EPCOS 800-043) but not able to find the voltage rating. Also, I have disabled the "DPMS".
I've run into the same problem on LCD projectors, and found that simply replacing the lamp does nothing. I believe that it is a software feature, which has to be reset by someone privy to the instructions to do so given only to certified repair facilities by the manufacturer. I also feel that this is something which should be investigated by the US Attorney General, since it violates US law.
Posted on Dec 22, 2007
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Posted on Jan 02, 2017
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