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

» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » Dolby CP200 Format Change Timeout

Author Topic: Dolby CP200 Format Change Timeout Daniel Alt Expert Film Handler Posts: 111 From: Lakewood, OH, USA Registered: Mar 2004 posted 08-22-2004 05:55 PM                     We are currently in the process of installing a CP200 in our theater to replace our aging UltraStereo processor. We've wired a simple pushbutton at each projector to serve as the remote sound change. It works just fine, BUT... When we select a new format at the front panel of the CP200, if we don't hit the pushbutton (or "GO") within about 90 seconds.. it just changes over anyway. This is NOT our preferred behavior. We've not found anything about this in the manuals we have. Is there a simple way to shut thie off? Ideally, we'd like to set the new format an arbitrary length of time in advance, and have it just sit there and wait for us to hit the push button for as long as we want it to. Thanks for any hellp.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 08-22-2004 07:44 PM                     This is not a feature, documented or otherwise of the CP-200. There is something else at work here. Until the "GO" terminal goes high (+15), it will not change. From your description, it almost sounds like you have a capacitor out there that is charging and when it crosses a certain threshold, the format switches. Again, this is not intrinsic in the CP200 design and I have never had that issue on the many, many, units I've installed and serviced. Steve  |  IP: Logged Rick Long Jedi Master Film Handler Posts: 759 From: Toronto, Ontario, Canada Registered: Nov 1999 posted 08-22-2004 09:16 PM                     First disconnect any control circuitry and see if the unit does this by itself, or if it is caused by your control circuitry. If you have the luxury of spare cards, try changing the 156 Projector/Format logic card.  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 08-22-2004 09:37 PM                    LOL...replacing the aging Ultra Stereo with the processor that never ages.  |  IP: Logged Daniel Alt Expert Film Handler Posts: 111 From: Lakewood, OH, USA Registered: Mar 2004 posted 08-23-2004 07:12 PM                     Thanks for the info.. We go back in to futz with it some more on Tuesday, so I'll keep ya'll posted. We DON'T have any spare cards, so let's hope the problem is an intermittent short somewhere in our remote control logic. Although it seems somewhat high-fallutin' to refer to three pushbuttons and a diode as "logic". Just to confuse the issue even FURTHER, the exciter lamps for the 35 projectors lost power just before the show, and we didn't notice right away. Hows that for bad timing? Since we had just installed this new sound processor, when there was no sound for the trailer reel, we assumed it was the processor. So we sit here and frantically press buttons on the CP200, wondering why there's no sound, while an auditorium full of freshmen is making up their own sound effects for the "Shreck 2" trailer. (Honestly, some of them were better than the original) Grrr.. Fortunately, the feature was in 16. (I never thought I'd hear myself say THAT phrase!)  |  IP: Logged Rick Long Jedi Master Film Handler Posts: 759 From: Toronto, Ontario, Canada Registered: Nov 1999 posted 08-24-2004 08:16 PM                     >>Although it seems somewhat high-fallutin' to refer to three pushbuttons and a diode as "logic".<< It has been some time since I installed 200's but if I remember correctly, you would need two diodes per pushbutton: one to trigger the projector select, the other to trigger the "GO". Just makes the logic a little higher-fallutin' is all. The diode in series with the projector select prevents a logical high from feeding back and triggering the "GO". Like-wise, the diode in series with the "GO" prevents a high feedback to projector select.  |  IP: Logged Daniel Alt Expert Film Handler Posts: 111 From: Lakewood, OH, USA Registered: Mar 2004 posted 08-25-2004 08:19 AM                     The ONLY thing we have remotely hooked up is "GO". We have three pushbuttons wired in parallel (one for each of three projectors), with one diode at the end of the chain. So we preselect the next format and projector at the panel, then move to the projector to actually do the changeover. One diode is all we need for that, right? Since we're not doing remote projector select?  |  IP: Logged Rick Long Jedi Master Film Handler Posts: 759 From: Toronto, Ontario, Canada Registered: Nov 1999 posted 08-25-2004 06:21 PM                     Should work just fine. I don't think the diode is even necessary here. Still interested what happens if the remote GO line is disconnected from the CP-200. Any chance of this line picking up interference from xenon striking or contactors?  |  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.