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Author Topic: AP3 platter problem John Walsh Film God Posts: 2490 From: Connecticut, USA, Earth, Milky Way Registered: Oct 1999 posted 01-20-2004 05:07 PM                     I have a problem with an Strong AW3 platter; hoping you guys can help. The platter was working OK until a few days ago. The problem is; Whichever deck is used for payout, that deck runs slow. The takeup is OK. I've tried several different payout heads (the 'new' phase control type) - same problem. I thought the varic may have a dead spot in it, so I replaced the entire varic assembly - same problem. I tried lowering the motor position, which speeds it up. But I need to lower it so far, it barely touches the deck, and the film wraps at startup because there's no torque. And since every motor acts the same, I don't think that's the problem. I feel it must be a voltage problem, since it happens with every deck. I've measured 25v on the varic. If I press down on the takeup carriage assembly, making the varic voltage go up, the platter runs OK. Also (strangely) the platter will run OK if I flip the feed caster on the unused deck to make it think it's taking up. Thanks for any suggestions!  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 01-20-2004 07:03 PM                     check the trimmer for the calibration of the payout head  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 01-21-2004 12:16 AM                     Not to be nitpicky, but do you mean AP3?  |  IP: Logged John Walsh Film God Posts: 2490 From: Connecticut, USA, Earth, Milky Way Registered: Oct 1999 posted 01-21-2004 10:39 AM                     Yes, sorry, it is an AP3; I have Christies on the brain....! Hi Gordon; I don't think it's the payout head... several of them do the same thing.  |  IP: Logged Daryl C. W. O'Shea Film God Posts: 3977 From: Midland Ontario Canada (where Panavision & IMAX lenses come from) Registered: Jun 2002 posted 01-21-2004 08:10 PM                        If they're all about the same age, Gordon's most likely correct.  |  IP: Logged Mike Pennell Expert Film Handler Posts: 150 From: Tucson, AZ, USA Registered: Apr 2003 posted 01-22-2004 02:00 AM                     We had the same problem awhile back, im trying to remember exactly what we did to rectify it. To get by we hung a weight from the pulley system which in turn increased the tension to the take up and sped up the payout. Hope this helps, when i go in tomorrow ill look at the platter and figure out what we did to solve it.  |  IP: Logged Michael Schaffer "Where is the Boardwalk Hotel?" Posts: 4143 From: Boston, MA Registered: Apr 2002 posted 01-22-2004 03:47 AM                        Since you even replaced the variac I am sure you also made sure it is set correctly as described in the manual? Sometimes it helps to "turn up the volume" on the hub a little. Regarding the trimpot on the control plate - does anyone know what measurements should be read when the phase mask is fully open?  |  IP: Logged

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