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Author Topic: Cinema Film Systems Manual!!! Michael Schaffer "Where is the Boardwalk Hotel?" Posts: 4143 From: Boston, MA Registered: Apr 2002 posted 07-14-2003 05:11 AM                        This was were the lead was welded on. I think the diodes look much nicer with the color jackets.  |  IP: Logged Tim Reed Better Projection Pays Posts: 5246 From: Northampton, PA Registered: Sep 1999 posted 07-14-2003 03:48 PM                       quote: Not when it actually burns the lead wire in half. I've never seen that - they were always overheated at a connection, like Michael's was. I'm not trying to say it didn't happen, but I don't see how vinyl insulation the thickness of heat-shrink tubing can cause a #4 AWG conductor to heat to the point of failure. If that were the case, insulated conductors everywhere would be failing like there was no tomorrow.  |  IP: Logged Darryl Spicer Film God Posts: 3250 From: Lexington, KY, USA Registered: Dec 2000 posted 07-14-2003 06:27 PM                    these slipped on and off of the leads not the ones that are shrunk around the wiring. The one that burnt in half I only saw happen once. The others I saw happen around the welds. By removing the covers it eliminated the heat buildup around the diode conection therefore we no longer had the welds burning in half.  |  IP: Logged Tim Reed Better Projection Pays Posts: 5246 From: Northampton, PA Registered: Sep 1999 posted 07-14-2003 06:36 PM                       Yes, I know the ones. Burns at the welds (or any cable connection) are due to poor mechanical/electrical contact, not convection. With the high current that flows through those diodes/cables, just half an ohm resistance can create a tremendous IR drop - which if left unchecked, will quickly deteriorate. That's what causes those kinds of failures. I seriously doubt it was the vinyl coverings, you probably just had a bad run of diodes. (Not taking you to task about anything, but think about it... how can a piece of plastic retain enough heat to melt metal?) The plastic would melt before anything happened, and then, if that were the problem, it would no longer be a problem.)  |  IP: Logged Darryl Spicer Film God Posts: 3250 From: Lexington, KY, USA Registered: Dec 2000 posted 07-14-2003 06:42 PM                    all I can say is after I removed all of them I never had one burn in half again. Maybe it was all the checking I did that fixed the problem. Anyway, we no longer use the covers on any of the units.  |  IP: Logged Tim Reed Better Projection Pays Posts: 5246 From: Northampton, PA Registered: Sep 1999 posted 07-14-2003 06:46 PM                       I understand, Darryl. Like I said, I'm not faulting you, I just don't see how that could've caused the trouble. (And the one that burned in two could've been rusted, or otherwise corroded, to begin with. I have seen those in less-than-clean condition.)  |  IP: Logged Michael Schaffer "Where is the Boardwalk Hotel?" Posts: 4143 From: Boston, MA Registered: Apr 2002 posted 07-15-2003 04:04 AM                        I think Daryl has a point. I have seen some diodes which did not have the shrunk-to-fit vinyl insulation, but an insulating hose slipped over them with a lot of air between the leads and the hose. That could contribute to the effect, likely in connection with an already bad connection (pun intended).  |  IP: Logged Tim Reed Better Projection Pays Posts: 5246 From: Northampton, PA Registered: Sep 1999 posted 07-15-2003 01:40 PM                       Yes, I know the ones you're talking about. It's "spaghetti", and not much thicker than heat-shrink tubing.  |  IP: Logged Ken Layton Phenomenal Film Handler Posts: 1452 From: Olympia, Wash. USA Registered: Sep 1999 posted 07-16-2003 09:18 AM                     So, does anyone actually have a manual for the Cinema Film Systems rack mount automation with the black faceplate? I've got a 3 screen that has these units and no manuals/schematics.  |  IP: Logged Darryl Spicer Film God Posts: 3250 From: Lexington, KY, USA Registered: Dec 2000 posted 07-16-2003 10:01 AM                    we have some schematics for the cfs consoles and boards.  |  IP: Logged

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