Chuck-
I realize it doesn't get _that_ hot. I was thinking of a bit more extreme heat than just a fan stopping.
I confirmed that stopping or unplugging either fan on the 1041Q will shut the projector down. There are two fans- One in the front near the tubes/power input, which blows directly across a heat sink, and a second which is near the focus module on the bottom (bottom being with the cover removed, projector mounted on ceiling.) Being more cautious then probably required, I'm not sure I would stop the fan blowing across the heat sink as this heat sink appears to be the hottest part in my projector. But on the flip side, it probably doesn't matter --- at 300 to 500 bucks in good condition these 10xx projectors are almost disposable if something does go wrong.
Just an idea- I have not tried the following, but suspect:
1) To outright eliminate both fans -one could measure the frequency of the tach wire on the fan. Cut wires to the fan. Use the Black/Red wires of the fan to power a 555 timer, and set up the 555 timer to generate the aprox frequency of the tach, sending the generated tach signal back to the projector. This should fool the PJ and keep it going. Done carefully, one could make a board smaller than the fan to mount in its place. I don't foresee any reason the tach wires from both fans couldn't be joined, so you would probably only need to do one 555 timer setup. In a worst case the tach wires may need to be diode isolated...
2) If one were to eliminate only one fan, and if those tach wires can be joined, you could simply unplug the desired fan and jump its tach wire to the fan still connected. Half the fans, probably half the noise.
If someone has the schematic available for email/dl I would love to play around and see if I can figure out a simpler mod than a 555 timer, as well as verify the tach signals could be connected together without isolation.
(edit for spell check only.)
--Kieth
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