Panasonic 900U

[Paisaab]

I have this projector for about 2 months now, and when I change source from DVD to TV- with a universal remote (Harmony 880) the projector switches off, then takes about 5 minutes to come back on....I have gotten around the problem by making the projector always "ON" on the remote. The question howver is, why does the PJ take so long to come back on afetr you power it off? Other TV's dont take that long....

 

[cthomp]

Restrike

Found this, hope it helps!
The post-lamp-off cooling requirement very much depends on your exact
projector make and model but the problem is generally that the bit that
matters - the anode and cathode of the lamp - requires forced air
cooling for a considerable time after being switched off. Cutting off
the mains during this time stops this cooling and stresses the lamp but
whether it leads to premature failure is hotly debated.
Most high pressure lamps will restrike for a few seconds after switch
off and again once cool but generally the lamps power supply won't be
able to generate a high enough voltage to strike the lamp when it's
warm but not hot. I can't see why it would matter to try to strike the
lamp in this state and to the best of my knowledge no-one designs
circuitry to protect against this if you remove mains and reapply it.
So the issue is not that you shouldn't switch it back on too soon after
switch off but rather that you shouldn't remove the mains before it's
properly cooled down.

 

[BMXTRIX]

The main question would be this: Why would you turn the projector off when you are switching inputs? This is not normal behavior at all and offers no value. Since it is typically believed that the initial startup of the lamp is one of the biggest killers of lamp life, you most DEFINITELY want to keep it to a minimum. It is believed that it is better to leave a projector on for about 20-30 minutes instead of turning it off for 20-30 minutes then turning it back on! That is (about) the loss of life that happens everytime you cycle the power on a projector.

Now, as for why - I can't really say, but these are lamps similar to what you see in parking lots - the big bright white or yellow ones that light the parking lot. You know when they flicker and go out... then take 5 minutes to come back on again? Same type of lamp. It isn't like a normal halogen or incandesent lamp which only takes a second or two to come back on at all.

Other TVs DO take that long - if your other TV is a projection DLP, LCD, or LCoS display. Regular CRTs don't take this long, but they use a completely different technology. Likewise, LCD and plasma flat panel displays don't use the same lamp technology that you are using.

Bottom line: Don't turn the projector off unless you are willing to wait out a full power cycle when you do it and are ready for the loss of lamp life that comes along with the power cycle.

 

[westcott]

I think it is a Harmony remote setting that is not properly implemented.

I would double check your sequence for switching inputs on your projector via your Logitech.