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Author Topic: Help with sound problem Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 05-29-2005 07:36 AM                     The problem I have with the C/O on the DP-75 is that it opens faster than it closes...if C/Os are not perfectly timed (frame accurate) you will double-image on c/o. At least this is true with a pair of circa 1993 units. On this pair, the async motors run a bit fast on USA 60Hz power.  |  IP: Logged Peter Hall Master Film Handler Posts: 314 From: London, UK Registered: Dec 2000 posted 05-30-2005 04:01 AM                        HI Steve We've got three pair doing changeovers and you are right - one paid is slow, the other two are OK. Not sure of a solution but when we do new electrics for these we use a seperate supply for changeover..  |  IP: Logged Pete Naples Phenomenal Film Handler Posts: 1565 From: Dunfermline, Scotland Registered: Feb 2001 posted 05-30-2005 04:16 AM                     I've had double imaging on older ones in the past, caused by the hydraulic damper on the change over assmebly not having any oil in it, so the blade on the outgoing machine was bouncing. As some numpty in the past had seen fit to remove the damper and re fit it 180º out, the filling screw was innaccessible so it took ages to take the damper off, clean it up, put it back the right way round and fill it up. Not my favourite machine!  |  IP: Logged Peter Hall Master Film Handler Posts: 314 From: London, UK Registered: Dec 2000 posted 05-31-2005 08:43 AM                        Pete Yes but can you name any other machine where you never have to touch the drive train ? If they are maintained well and very frequently then they run pretty good - the two in Liverpool ran 70mm on opening with no pix movement at all - you couldnt hear them running  |  IP: Logged Clive Carmock Film Handler Posts: 24 From: Morden, Surrey, UK Registered: Dec 2004 posted 06-01-2005 05:07 PM                     Thanks to everyone here for their help with working this sound problem through with me. In the end I did need a resistor across the cell - but went for a 2.2k resistor in the end as a 1k one removed too much useful signal. However also I found that the screen in the XLR cable wasn't actually earthed at either end. So I re-made the pin 1 connection at the projector end and ensured it had a good ground connection - that coupled with the resistor and the hum is gone. Once again many thanks to all who offered help and advice. Regards Clive  |  IP: Logged

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