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Author Topic: NEC 900C rainbow Brian DeCiancio Film Handler Posts: 52 From: Warren, OH, USA Registered: Sep 2002 posted 04-28-2016 04:59 PM                        I had strange arced "rainbows" show up one day on a 900C. Three of them were visible on the left 1/3 of the screen Oddly, the fix was as simple as removing and reseating the lens. Just wanted to share. (I can't get the image to upload).  |  IP: Logged Rachael Barbash Film Handler Posts: 31 From: Columbus, Ohio, US Registered: Feb 2009 posted 05-20-2016 07:27 PM                        On one of our NC1200c we've been having kind of almost a reddish reflection on screen whenever the lamp is on. I wonder if it's a similar problem. Did you remove the lens yourself or have an outside tech do it? Thanks for posting!  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 05-21-2016 09:54 AM                     Since the NC-900 lens is bayonet mount I am surprised that just removing and re-seating it was the fix. Very odd.... Rachael, On yours try closing the douser and see if the red smear goes away with it closed. NEC's generally do have a bit of light leakage in idle mode with the lamp lit, but nothing terrible. Mark  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 05-21-2016 05:59 PM                     any chance we are talking about moiré effect? Reinstalling the lens maybe drifted the focus a little. Cannot find a picture that shows it. Can you try re-focussing the projector using a test pattern? If I'm right the 'rainbow' will come back. Nothing you can do for it besides defocussing the picture - or replacing the screen  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 05-22-2016 05:39 PM                     Or just re-level it just slightly. You want it in focus. Not out of focus. Mark  |  IP: Logged Brian DeCiancio Film Handler Posts: 52 From: Warren, OH, USA Registered: Sep 2002 posted 05-24-2016 12:31 PM                        I re-seated the lens myself. It wasn't difficult.  |  IP: Logged

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