my profile | my password | search | faq & rules | forum home

» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » Christie 35GPS aperture and turret motor timing

Author Topic: Christie 35GPS aperture and turret motor timing Michael Schaffer "Where is the Boardwalk Hotel?" Posts: 4143 From: Boston, MA Registered: Apr 2002 posted 01-21-2006 03:21 AM                        According to the manual, the motor on-times are set with trimpots on the PCB on the non-operating side. I have a relatively new location in Mexico (1 1/2) years which complained about the aperture not going up and down far enough. This looks like something which should be quick and easy to adjust. But - since the location is several hours away and I will only have time to go there for one day, I want to take all potentially needed spare parts with me. So, in your experience, is this a problem that is usually cured by adjusting the trimpots or are there potential other problems? When the motors are overtimed the first time, does this lead to deterioration of the drive wheels because they overrun for too long and wear down too much? Could the motors be timed correctly but the drive wheels are slipping because of mechanincal misalignment? I don't think I will find problems like excessive dirt build-up in the aperture area which would jam the plate since the operators in that location usually clean really well. But I will still check that, of course. BTW, how are the motors timed on older versions of the Christie projector?  |  IP: Logged Frank Dubrois Jedi Master Film Handler Posts: 896 From: Cleveland, OH Registered: Mar 2005 posted 01-21-2006 09:37 AM                    I found that it was nothing more than a small turn of a trimpot. I adjusted ours about 6 months ago and haven't noticed any negative effects. Ours "overrun" about one second, in my experience, not much more is needed, and if it is, perhaps the aperature plate is sticking?!?  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 01-21-2006 12:10 PM                     Be sure to adjust the timming with the gate hot after a normal feature film is run. Allowing the projector to get to operating temperature matters alot with this adjustment. When its hot the parts expand and the aperature generally slows down even more.... I believe this is a 555 timer circuit who's timming is also greatly effected by heat. Happy timming adjustment! Mark  |  IP: Logged

All times are Central (GMT -6:00)

Printer-friendly view of this topic

Hop To: Select a Forum: Category: Operations -------------------- Digital Cinema Forum Film Handlers' Forum Large Format Forum Ground Level Feature Info, Trailer Attachments & REAL Credit Offsets Category: Community -------------------- Film-Yak Film Handlers' Movie Reviews The Afterlife Bob Maar's Joke-A-Thon Category: Classified -------------------- Equipment and Supplies Wanted/For Sale Help Wanted/Seeking Employment Category: System -------------------- Software Beta Testing Forum

The Film-Tech Forums are designed for various members related to the cinema industry to express their opinions, viewpoints and testimonials on various products, services and events based upon speculation, personal knowledge and factual information through use, therefore all views represented here allow no liability upon the publishers of this web site and the owners of said views assume no liability for any ill will resulting from these postings. The posts made here are for educational as well as entertainment purposes and as such anyone viewing this portion of the website must accept these views as statements of the author of that opinion and agrees to release the authors from any and all liability.