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Author Topic: Inspecting image for artifacts: Barco: light pipe: prism. Maintenance Eric Robinson Jedi Master Film Handler Posts: 538 From: Santa Rosa, CA Registered: Jan 2005 posted 05-26-2012 11:17 AM                     Im looking at the Barco one year maintenance processes and the following is listed: Check the condition (hot state) of the light pipe and prism by looking for artifacts in the projected full white and full black patterns. I'm wondering what visual artifacts I might see if indeed the light pipe or prism are damaged or defective. Any thoughts?  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 05-26-2012 12:03 PM                     Cracks/chips will show up as impurities in the white color (you may see a magenta spot, for example). It doesn't take much. Generally, they will be colored artifacts though.  |  IP: Logged Francisco Castro Film Handler Posts: 1 From: Ermesinde, Porto/Douro, Portugal Registered: May 2012 posted 06-03-2012 01:24 AM                     It´s possible that DMD's at light engine get's "tired" and the ligh output decrease from 17ft to 7 and 6 in 2D ? This happened is Barco's Serie II Projectors. Or is something about the clenaning of the prism?  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 06-03-2012 04:57 AM                     Digital projectors will lose light efficiency over time. Christie recommends to replace the reflector after 10 lamp change if I remember correctly. On a Barco, you may want to check the fold mirror in front of the lamphouse and the integrator rod, which sometimes can get dusty. Everything else is sealed but I understand that, yes, they lose efficiency, but maybe not 60% over 2 years! Also, remember the screen - particularly if high gain - will lose gain over time.  |  IP: Logged Kris Verhanneman Expert Film Handler Posts: 182 From: Belgium Registered: Dec 2009 posted 06-03-2012 06:26 AM                     Francisco, when you loose that much light in this little time you need a tech to check your projector. Maybe someting changed in the alignement of the mirrors. Or give another lamp a go and check the adapters / connectors.  |  IP: Logged

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