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Author Topic: NEC filter price Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 02-05-2014 03:40 PM                     Mark, I got it, and I may do it next time. I'm just saying that for the money they ask it would be nice to find some gaskets ON the filters themselves! How do you recognise if the light engine is sealed or not?  |  IP: Logged Dave Macaulay Film God Posts: 2321 From: Toronto, Canada Registered: Apr 2001 posted 02-06-2014 05:49 AM                     One clue whether the light engine is sealed is if it doesn't have a LAD fan blowing into it.  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 02-06-2014 06:09 AM                     Barco do not have LAD on their light engines. Never had.  |  IP: Logged Dave Macaulay Film God Posts: 2321 From: Toronto, Canada Registered: Apr 2001 posted 02-06-2014 06:28 AM                     Exactly. Barco has has a "sealed" light engine. The first "digital" projector I saw was at Imax, a DPI unit I think (?) that had a lot of HEPA filters and a lot of fans. You were almost expected to have a clean room if you needed to open the brain case. It had dust spots visible on screen... but I'm sure that there had been many Imax staff opening the thing to peer at the workings. I recommend Barco for dirty environments (ie drive-in booths) because of the sealed light engine.  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 02-06-2014 12:17 PM                     Ok, but I'm quoting Mark: quote: Mark Gulbrandsen As for Barko... How many of their light engines are actually still sealed? None of the Barkos I've installed lately have sealed light engines and I remember them saying they were moving away from that because of cost. Then my question: how to you recognise a sealed Barco engine from a non-sealed one?  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 02-07-2014 02:37 PM                     Marco... I just installed a used DP-2000 and it DID NOT have a sealed light engine. In fact the projector was so dirty all over inside that I had to literally dismantle the entire projector and clean everything in it, prisms included. (Job Security!) It's easy to tell a sealed light engine from one that is not because a sealed engine is inside it's own metal housing. On an open light engine you can see the glass prism's, heat sinks, cooling hose, formatter boards, etc. And when the lamp is lit you also see the three primary colors. Mark  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 02-07-2014 03:34 PM                     I'm afraid you are mistaken Mark, The metal housing has nothing to do with the light engine being sealed or not. When Barco say the light engine is sealed it means the DMD are in place without air gaps, there are gaskets around them and no air is allowed inside. Christie is blowing laminar air to the DMD surface to keep them clean (they say. I say to keep them cool!). All Barco engines are sealed, maybe the old ones were more sealed, having an aluminium box around them, but that does not change the fact that they are still ALL sealed.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 02-07-2014 05:39 PM                     Well, according to the Patent they only use sealent tape. (Shaking head). I wonder how long that will last. You still have the output face of the prism that gets dirty irregardless because of the poor air filtration.  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 02-08-2014 02:42 AM                     It would last more than an open gap!  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 02-08-2014 07:35 PM                     I think Barco even quotes a sealed light engine for their cheapest 10Sx/8Sx machine. - Carsten  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 02-09-2014 04:15 AM                     Baro light engines are all sealed. I know the Christie 2210 is sealed as well. Not sure about NEC but I have an instance where because of bad management lots of dust has entered the light path, I could focus it on a piece of paper moving the focus all the way back. Projector ruined (red halos on black), only solution to replace the light engine - according to NEC.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 02-09-2014 06:34 PM                     Actually open gap light engine is very easy to clean with the right cleaner and cleaning tissues. I;ve had to clean older Christie engines several times beause of operation without filters. And yes, you have to pull the engine out to do it. With different amounts of expansion of the glass between the three primary colors one would think that air gapped engines would be the best way to go. I know that Christie very slightly sacrifices perfect focus of one primary color (they taught and showed us that in advanced training) because they can not get the prism the exact right length and still have it converge properly. Never saw that issue from Barko or NEC though.  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 02-10-2014 04:14 PM                     What Christie told me to explain the slightly misconvergence of RED is that because of the different wavelength it won't - and cannot - be perfectly aligned with the others. I thought it made sense at the time.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 02-10-2014 04:41 PM                     Yes...it is red and all of them have it to some degree. When I converge I tend to not converge Blue To red ever...they are at opposites. I go Blue to Green and Red to Green. If Blue is fixed...do green to blue first then red to green.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 02-11-2014 06:19 PM                     Marco... I don't think it actually has to do with wavelength. It has to do with it not being able to be in focus perfectly. Some slight physical shortcoming in the relation of the red prism to the other two.  |  IP: Logged

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