NEC MT850 I have an NEC MT850 which recently likes to power itself down. As if the AC has been removed. It comes back after a time. I replaced the unit with a system which has been OK and now it displays the same problem. It acts like an internal breaker is being thrown. I don't have schematics for the projector wonder if anyone else has experienced this. I have checked the AC to the projectors and it appears OK when metered. Only 500 hours of lamp and projector use on the most recent unit.

We cleaned the filter on the projector and it has never happened since. Assume that it was overheating due to lack of airflow.

I have same projector and had same issue. An NEC repair guy said that usually means it is getting too hot. I set a little fan next to it when it is on and I no longer have this problem. This can also be caused be re-lamped bulbs. Problem usually goes away if you have a re-lamped bulb and buy a factory bulb.

As there were no indicator lights lit I focused on the AC. The projectors work as they should in another location and as such I am fairly certain the problem is associated with the AC power in the particular room. I haven't isolated the exact condition as yet.

Thanks