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Author Topic: Testing Cat 701's without test film Jeremy Weigel Phenomenal Film Handler Posts: 1062 From: Edmond, OK, USA Registered: Mar 2007 posted 12-29-2013 10:05 AM                     I have a few Dolby 701's and DA20's that have been out of service for a couple years and have a few potential buyers. Is there a way to test the strength of the LEDs without running 69T film?  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 12-29-2013 12:45 PM                     The strength? Yeah, pretty easy with an O-Scope...run any DD film (Trailers...etc) and look at the whiter-than-white burst (when it is reading the perfs)...it should be 4.0 Vp-p, ideally...By 2V p-p things get dicey. I wouldn't base any alignment on non-measured film but just LED level...nothing fancy is required. Now, if you have a CP650 laying about...use it. Either on the CP650 software or via the front panel (need to put it in tech mode)...the CP650 will read out the output level in volts with 1/10V accuracy.  |  IP: Logged Sam D. Chavez Film God Posts: 2153 From: Martinez, CA USA Registered: Aug 2003 posted 12-29-2013 12:52 PM                       I think maybe Jeremy doesn't have a convenient way to roll film.  |  IP: Logged Jeremy Weigel Phenomenal Film Handler Posts: 1062 From: Edmond, OK, USA Registered: Mar 2007 posted 12-29-2013 03:40 PM                     Thanks Sam. Guess I should have been clear.  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 12-29-2013 05:46 PM                        You could just turn it on and check video level. The perf is a hole so even with no film that part would read correctly. With basement readers, we could set up with no film and get good usable results. Then, with film, we then tweaked it to spec. 90% of the way there with no film or motor. Louis  |  IP: Logged

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