|Originally posted by Rick Guynn
I would caution against doing a completely fixed fan speed, as you wouldn't want to chance overheating the PJ by limiting the airflow should it got hot for some reason.
I thought about this, and I don't believe it would be an issue (at least for the PLV60, don't know about the Z1 or others). The PLV60 has an overtemp shutdown indicator, so I would suppose that if you set the fan speed too low and the internal temp gets too high, the bulb would power off in an overtemp condition, preventing any catastrophic failure.
Then, just tweak the fan speed higher, until you avoid any overtemp condition (in theory).
The reason I believe I could set the PLV60 fan speed to a single intermediate speed safely is that when I used the service menu option to override the automatic variable fan speed control, the fan speed went to a VERY high speed, higher than *any* speed I had ever heard from the PLV60 during extended operation (3-6 hours or more).
During long use, I can hear the fan cycle from what I would call the "default" low speed (the fan speed when the projector has just warmed up after the 30 second countdown through the first few minutes of full brightness use) to some higher than "default" speed that is *much* lower than the full-on speed I heard with the service menu fan speed override.
Hence, it is obvious that (at least in my setup) my PLV60 has a lot of fan speed range between the top automatic fan speed I hear in normal operation and the full speed heard using the speed override in the service menu.
I want to set my fan speed somewhere between the top speed heard during automatic operation and the full override speed.