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Author Topic: NC900 light engine rebuilds Greg Routenburg Expert Film Handler Posts: 178 From: Toronto, ON, Canada Registered: May 2003 posted 01-22-2019 12:42 PM                     As I understand it, the Christie DMDs and their formatters are mounted to a frame that is then glued to the prism. The frame has adjustment screws built in to allow for convergence adjustments to be made. The only expedient way to have a Christie LE fixed if you have a DMD or Formatter failure is to purchase a replacement LE and submit the defective one for a core credit. They take the defective units in, clean & rebuild them and then sell them as refurbished. You may still be able to send your LE in for repair but you're dark until it comes back. You also need to wait for a manufacturing slot to come available before it gets looked at. It's not usually that long but you're really at the mercy of their order load at the time you send it in for repair.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 01-22-2019 04:02 PM                     Greg, I'm 99% certain on the NEC, the DMD is NOT glued to the prism. I've removed a formatter on an NC1200 in recent memory (within the last 4 months) due to contamination being blown in by the cooling fan) and the DMD was on the formatter board. There was a neoprene (could be another material) gasket that would seal it up to the prism but it definitely wasn't glued there. And, I seem to recall from my NC900 training that the DMD was non-adjustable and was also connected to the formatter board. Which makes sense, the formatter is what drives it.  |  IP: Logged Greg Routenburg Expert Film Handler Posts: 178 From: Toronto, ON, Canada Registered: May 2003 posted 01-27-2019 11:39 AM                     Steve, The last formatter that I ordered for an NEC projector came without a DMD. There were gold plated pads on the PCB where spring loaded pins on the back of the DMD socket seated against the formatter. I can't speak to how the DMD itself was held to the prism or aligned in the first place. It could very well be a pressure fit as you describe. When I spoke of gluing, it was the Christie LE. NEC doesn't have the DMDs listed in the parts list and when I've had the "Blue DMD Starfield" failure on a 900C, I was advised that a factory rebuilt prism would be require because the DMDs are not field serviceable. I hope that clarifies things a little bit.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 01-27-2019 06:12 PM                     Yeah, somewhat. So when you changed the formatter...was the DMD still on the prism? Or did you transfer the DMD from the old formatter to the new? And if you transferred the DMD...that would debunk changing the DMDs as a non-field item.  |  IP: Logged Greg Routenburg Expert Film Handler Posts: 178 From: Toronto, ON, Canada Registered: May 2003 posted 01-27-2019 11:28 PM                     So when I changed the formatter, the DMD stayed on the prism. I honestly made no attempt to try and remove it. Don’t have the budget to be messing with them too much if ya know what I mean. I just swapped the boards, torqued the screws that secure the formatter to the NEC specified values and it worked.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 01-28-2019 08:11 AM                     NEC has a convergence mount the DMD's are mounted in and there is also a seal between DMD face and prism to keep dust out. Christie has the dust blower system built into their DMD mounts. Mark  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 01-29-2019 07:03 AM                     That would actually make sense then, given no adjustments. So yeah, NEC has to get the DMD alignment exact, at the factory, on the prism. So yeah, in the event of a bad DMD...a new prism would be required.  |  IP: Logged

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