Sanyo PLC XE40 Out of focus

[JPTech]

After cleaning the inside of many Sanyo projectors I have reassembled a Sanyo PLC XE40 and it will not focus. I have looked everywhere for an idea on where there might be another focus besides the focus ring. I have taken it back apart to make sure all lenses were where they should be by comparing to a projector I haven't cleaned yet and all seem to be correct....any suggestions?

[timzim]

Are you sure it's the projector? I've had similar problems with the same projector connected to an IWB. Turns out it was the splitter downgrading the bandwidth making it impossible to get a clear image.

[JPTech]

I will look into this...thanks

[jon_nais]

how deep did you clean the projector?

I had this once when I went crazy and cleaned the LCD panels and all other colour filters etc round the prism on an XE-40. It turned out I had not screwed one of the panels on tight enough and it being out by a teeny tiny fraction of an inch caused it to be out of focus on the board.

I tightened everything back up again and it was able to be focused but only at the far extreme of the focus ring.

I learnt my lesson and no longer unscrew anything near the prism....

[MbroTech]

You can never get them totally in focus anyway due to the lens and the angle/distance they project at the board. If the top is in focus the bottom is out and vice versa. Best to get it sharp somewhere in the middle and hope for the best.

[Marc-Engineer]

Hi, if the projector is set up correctly every pixel should be in focus and defined, the only reason that you may get top and bottom at different focus is either the projector is upside down or to high (and i mean feet downwards) as i have seen this in so many classrooms you would not belive, all projectors must ALWAYS be mounted FEET UPWARDS if from a ceiling mounting any other way will shorten its life and with in 1ft of the top of the whiteboard, OK back on topic,......... are you saying you dismantled the lens assembly??????

 

Marc

Projector Engineer

[MbroTech]

Oh they are mounted feet upwards on an Activ+2 boom on their mount. Just that they sometimes project down at such an angle it's no wonder it's drifted by the bottom of the board.

 

They also (on 64 boards) cast well over the actual board in a massive trapezium. Takes hefty use of the keystone to get them anywhere near right and even when you try to get a pixel match (1024x768) the image still looks badly scaled sometimes.

 

I for one whould never dismantle a lens assembly!

[Marc-Engineer]

Yes heavy use of the Keystone will effect quality but i have seen some projectors at the wrong distance from the board (on +2s) and then they try to coeect by tipping the projector downwards if its mounted right the projector should be just about horizontal.

The other cause is fitted by a none registred installer and the vertical mount incorectly fitted to rear of the boardmount making the projector boom at the wrong height for the board.

 

 

Marc

Projector Engineer

 

PS i didnt mean +2 projectors when i spoke about upside down

Edited November 3, 2011 by Marc-Engineer

[MbroTech]

That's what the installers must have done then. Little trouble on our 78" +2's, just the 68" that display such issues.

[JPTech]

Yes....when I was shown how to clean the projectors they had me take every lens out and wipe the dust off and put back in. I had problems on the first couple of projectors by putting lenses in backwards, getting a filter in crooked, etc. I now know how the lenses and filters should be so I know that is not the problem. I sent it in to a Sanyo repair facility this morning.

 

Thanks for the responses....JP

[Marc-Engineer]

OK you do not normally have to clean the lens assembly, the dust that gets in there can be dismissed as not worth bothering with.

End users should NEVER dismantle lens assembly's.

 

Marc

Projector engineer