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Author Topic: Drop contrast on Barco DP2k-12c Ivan Ivanov Film Handler Posts: 4 From: Moscow, Russia, Russia Registered: Feb 2016 posted 02-05-2016 07:04 PM                     Please help with contrast problem on Barco-DP2K-12c. 3,5 Year old PJ located in controlled temperature and dust environment. Last time (1,5 year ago) when measurement ON/OFF contrast by Klein-10A it was at about 1:2100. All Maintenance procedure done on time. Nothing change in projector expect lamps and software, same place, same room, same screen. Now contrast drop to 1:1200. Check and clean Light pipe, optics, port window, try different optics, check lamp, Install latest software, check PCF, actually check everything and finally nothing helps.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 02-05-2016 09:32 PM                     Seems like there was another post with a Barco and a similar issue not too long ago...  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 02-06-2016 05:03 AM                     Yup, could be a similar thing: http://www.film-tech.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=16;t=002497#000005 - Carsten  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 02-06-2016 08:28 AM                     The prism exit area on Barco machines tend to get dusty. 12C should not be severely affected, particularly in a dust controlled environment, and dust on the prism exit and lens should not affect the black level and ON/OFF contrast - only the ANSI/interframe contrast. My point is that nobody usually checks these values and what you found may be something common which has not been noticed around. Another point is: how do you check contrast? Pointing the meter to the projector or to the screen? The auditorium will have a great impact on contrast if there is any residual light. Let us know how it goes.  |  IP: Logged Ivan Ivanov Film Handler Posts: 4 From: Moscow, Russia, Russia Registered: Feb 2016 posted 02-06-2016 10:16 AM                     For Check contrast use Black and White test pattern from Communicator. Measurement by Klein-K10A from the centre of the screen. Projector installed in post production grading room, with matte black wall, no EXIT sign, or lights on stairs. With projector switched OFF i measurement 0,00001 ftl on the screen.  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 02-06-2016 11:01 AM                     Ivan, Try pointing the meter towards the projector - you may have a diffuser to add to provide you a reliable reading. That way the measured levels will be much higher and the room and the tool sensitivity won't affect the readings so much. I appreciate the room is very dark but contrast is greatly affected by the tiniest amount of light, even a little tea table in the wrong place can affect a reading - that said ON/OFF readings shouldn't be too affected.  |  IP: Logged Ivan Ivanov Film Handler Posts: 4 From: Moscow, Russia, Russia Registered: Feb 2016 posted 02-06-2016 02:23 PM                     Marco, My problem is: Projector, room, screen, wall paint don't change between measurement. I has contrast 1:2100 in this room with same colormeter, also with different one for exclude problem with colormeter.  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 02-06-2016 06:03 PM                     I was just trying to rule out elements. If you already know the room is ok, then open a ticket with Barco and request a new light engine.  |  IP: Logged Ivan Ivanov Film Handler Posts: 4 From: Moscow, Russia, Russia Registered: Feb 2016 posted 02-06-2016 07:27 PM                     Thank You Marco for help. I'm already send all information to Barco, but I was hoping that maybe i'm was missing something.  |  IP: Logged

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