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This topic comprises 2 pages: 1 2
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Author
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Topic: Christie CA21 automation problems.
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Joe Redifer
You need a beating today
Posts: 12859
From: Denver, Colorado
Registered: May 99
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posted 09-28-1999 01:33 AM
Here is another update in the ongoing CA21 thread here.
It seems that Pennywise is pretty cool. I e-mailed them and discussed a few things, and their tech got back to me with the following e-mail:"Good to hear from you Joe. I appreciate your requirements and will make changes
as required. Your comment "or it will keep motoring through onto the floor
forever" is a worry. It should certainly not do that! The software for Mann Theatres had quite a few changes from the normal Christie
software and maybe some of these changes have affected filmbreak. In the next day or two I will set up a CA21 with Mann software and do some
testing/changes and let you know. Best regards, Mark Justice." Joe here again. Now is that class or what? Let's hear it for Pennywise!
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Joe Redifer
You need a beating today
Posts: 12859
From: Denver, Colorado
Registered: May 99
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posted 10-06-1999 10:38 PM
I haven't heard back from Mark yet. Is time slower in Austrailia? Anyway, I think these things are getting worse. It seems that the failsafe doesn't really matter anymore. Just yesterday, a movie started and the platter failed to take up at the show start for one reason or another (doesn't really matter why at this point). The failsafes dropped and kept spooling film onto the floor. Luckilly only the ads hit the floor before I JUST HAPPENED to walk by and notice. This had happened before, but it prompted me to start playing with the failsafes. I found out something interesting, as is explained in this letter to Mark of Pennywise (cc'd to Bevan Wright of Christie)Mark, Here is something else about the CA-21 that I have discovered that is very interesting: If the failsafes are down, the movie will still start up normally, read all cues and do everything it's supposed to do, except stopping the projector. It does not matter if the first cue is MOTOR START or AUTOSTART, it completely ignores the failsafes. Even if I raise them and drop them nothing will happen. Of course, if a show is run in this manner, the AUTOSTOP cue will close the changeover. But when the film runs out, the projector will not stop and the changeover melts. I can replicate this on every projector. Thought you should know. (Hopefully I can get a response out of this one. Maybe they are reprogramming the chip from scratch).
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Alex Mir
Film Handler
Posts: 2
From: Buenos Aires, Argentina
Registered: Oct 1999
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posted 10-27-1999 10:05 AM
Hi Guys,Here's some info about the CA21 I can share...
We have been installing and servicing CA21 units since 3 years and found quite amazing things. Basically it is a 6805 CPU with his peripherals. Very versatile, but it has the tipical problem of all the computers on industrial uses: Noise Inmunity.
On very noisy environments like the booth, the CA21 is very sensitive especially to the ignition of the bulb. On some units (more on the new ones) we saw the CA21 getting crazy while stricking the bulb.
After a lot of tests (many small capacitors on the motherboard, filters on the AC input, grounding and isolating) we found the way to minimize this: reducing the striking noise by reducing the spark gap. This reduces significantly the noise emmission and works fine !! In reference to the behavior of the failsafe, you have to consider that there are a lot of software versions recorded on the Eproms according to different customers. Pennywise usually programs the failsafe to be active few seconds after the dowser opening, and it does not come active if the failsafe starts low (broken film). My suggestion is that you contact directly to Mark Justice at mark@pennywise.com.au, and ask him wich changes can be made according to your requirements.
He may email you a new software version so you can record your own eproms. If there's anything else I can help don't hesitate to contact me at Alex.Mir@Newage.com.ar
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