I bought a broke JVC RS40 off ebay and lost the gamble. The seller liquidator sounded like it might just be a broke light engine door or a bad lamp. I got the projector yesterday and I'm afraid its going to be more than that. I feel like a big loser today.
Anyway, before I conclude that I wasted my $700 I'd like to at least get a wiring diagram and attempt to troubleshoot the beast. Right now it wont even power up the lamp or fans and you would think something that obvious could be taken care of.
I just checked with JVC and they want $50 for a wiring diagram! I can still remember a time when GE televisions used to put the wiring schematic right inside the tv or appliance back in the old days. A free schematic for the serviceman! That was back when service was important to a manufacturer I guess.
Do I want to throw away another $50 on this thing? I'm not so sure about that. At least with the projector itself I can junk out the parts and recoup some of the investment.
I just tore the thing apart to see how it layed out. Apparently the main power supply feeds another box which feeds the lamp. I saw that voltage was getting to the lamp power supply so I decided to take the lamp out and hook it up with jump wires direct to the lamp power supply. When I did low and behold the lamp started lighting and fans started to run. But all is still not good because the lamp goes out shortly after the fans start up. The normal sequence is that first the lamp starts glowing a soft blue and then it appears current is cranked up steadily for a couple seconds. During that time the lamp goes from blue to bright white and then the lamp fan starts up. Then the lamp goes out and the fan continues to run in cool down mode.
The lamp power supply is obviously monitoring the bulb because if I unplug the bulb completely I get no fans at all. When I look into the bulb it appears clear without any burn or other abnormality. And the bulb appears very bright for no longer than it is on. But I am still wondering if the feedbock going back to the bulb power supply may be shutting things down.