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Author Topic: Barco S series brightness issues Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 11-01-2015 03:08 PM                     Sony recommends: 'Absolute alcohol (ethanol: 99.5% or more, propanol: 99.5% or more)' in their maintenance manuals, not only for glas surfaces, also for their sandwich color filters and mirrors. I inquired at a german supplier for various ethanols, and they told me they sell their 99,9 ethanol to Leitz/Leica for optical cleaning applications. Christie recommends Acetone and Isopropyl for specific parts only, so they should know why. And I wouldn't recommend Acetone for this job in general. Acetone is actually not very harmful: https://en.wikipedia.org/wiki/Acetone#Toxicology - Carsten  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 11-02-2015 06:04 AM                     The two biggest harms with Acetone is skin contact (mitigated by gloves) and proper ventilation. Secondary is its ability to burn. Note even Isopropyl Alcohol has both of those though not as pungent on the vapor side. Most don't take the skin contact portion as seriously as they should. As the water content goes down, the more harmful it is to skin contact.  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 12-02-2015 04:56 PM                     BTW - what does everyone use as wipers/tab for cleaning optical surfaces? - Carsten  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 12-02-2015 08:24 PM                     Depends on what it is I'm trying to remove. I start with the least contact as possible and work up from there. So air is where I start...then a very soft brush. However, I often find myself using lens tissue and lens cleaner when the substance is baked on a bit. I fear that any form of dry rubbing would actually tend to scratch the surface more than the fear of using lens cleaner (alcohol based).  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 12-02-2015 09:27 PM                     I found this a few minutes ago: http://www.edmundoptics.com/technical-resources-center/optics/cleaning-optics/ - Carsten  |  IP: Logged Marlon Martins Film Handler Posts: 78 From: Torres, RS, Brazil Registered: Apr 2015 posted 12-02-2015 11:34 PM                     I created a topic a few days ago on this problem also (a 10s). i was wondering that may be the air exhaust was not getting proper air flow (pipes were too long, motor was not able to push properly). a barco 19B was installed in the place of the 10s, and the projector was alerting about "no exhaust flow". after removing the pipes, the problem disappeared. the people who installed was thinking the exhaust sensor was bad, but no, was the exhaust piping. (the same exhaust the 10s was using previously) after transporting the 10s projector, the front lens was removed, and was covered with dust in the internal lens surface. so, when we install the 10s again in the other room, i will highly suggest a "full-cleaning" of the optical components, and test the brightness again. then change to a new lamp, and test again. we need to know where the problem is... (the projector is less then a year old)  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 12-03-2015 06:26 AM                     You mean, it was IN the lens, or ON the projector side lens surface? VERY strange, but at least an explanation for the reduced brightness... Well, you know now how to clean a lens ;-) - Carsten  |  IP: Logged Marlon Martins Film Handler Posts: 78 From: Torres, RS, Brazil Registered: Apr 2015 posted 12-03-2015 01:27 PM                     the lens was covered in dust (the part of the lens that goes inside the projector) did not look at the projector itself. soon we will dig deeper in this problem  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 12-03-2015 03:02 PM                     I thought you said you cleaned the optics - including the DMDs and the prism! - and you didn't clean the back of the lens which is the first to get dusty? Carsten The back of the lens normally gets really dirty on a Barco. An S projector I serviced was awful because the filter seal was not fully touching the filter frame (by design) and unfiltered air managed to get in. In fairness on Christie projectors the area prism-lens is sealed and no dust whatsoever can cover that delicate area. Is there a flow switch on an S machine? Don't think so.  |  IP: Logged

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