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Author Topic: argh! mysterious digital problem...
Richard Hamilton
Phenomenal Film Handler

Posts: 1341
From: Evansville, Indiana
Registered: Jan 2000


 - posted 09-11-2000 08:29 PM      Profile for Richard Hamilton   Email Richard Hamilton   Send New Private Message       Edit/Delete Post 
"play around with the light pipe a little bit"????


"

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Brad Miller
Administrator

Posts: 17775
From: Plano, TX (36.2 miles NW of Rockwall)
Registered: May 99


 - posted 09-12-2000 01:43 AM      Profile for Brad Miller   Author's Homepage   Email Brad Miller       Edit/Delete Post 
There were bad molex connectors on some of the power supplies on earlier models. Don't rule that out.

Please clarify these and we'll take it from there...

You are never getting a number, only a "-" on the display...right?

What did this particular auditorium typically run error-wise at before this incident?

Also, it just happened very suddenly one day and this was not a gradual thing, right?

Was anything done to the machine when it died? (Such as changing to a new lamp.)

Are you certain the bulb is fully seated properly in the holder? Take the back cover of the reader off slowly and peek inside. Sometimes the wire can twist the bulb a little bit and knock the lamp just slightly out of the socket which kills the light onto the ccd.


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Gracia L. Babbidge
Jedi Master Film Handler

Posts: 709
From: Bowdoin, Maine
Registered: Aug 2000


 - posted 09-12-2000 02:21 AM      Profile for Gracia L. Babbidge   Author's Homepage   Email Gracia L. Babbidge   Send New Private Message       Edit/Delete Post 
Ok Brad - to answer your questions...

-only a '-' no numbers, no 'F', in the past 9 days

-the theater opened in late winter this year, and was open for at least a month before we actually got the SRD working, but once it was all squared away, we had no problems with it until last weekend; as far as numbers displayed, film trailers & policy trailers could get anything from a 6 to an F, but the prints generally got from a 3 to a 6

-it was not gradual, the SRD was working for three matinee shows, then I came in for the evening shift, and when I started the first evening showing on that projector, I immediately noticed the problem

-the only thing done to the machine when this happened was that had I threaded the film, then hit the start button!

Now, I am not aware of the what full extent of the initial problem was with the equipment, though it seems that the initial problem was with the DA20. At that point we had a projectionist / tech working for us, and he eventually got the ailments worked out. That person has since gone to work elsewhere in the country.
The bulb that is in the reader has been there for just under 8 months, and I do have a spare, but I am 99% certain that the bulb is not the problem.

Now, I did try to open up part of the reader to see if the cable was loose, but I ran into a problem - not being able to remove a particular screw, as the top of the screw seems to have been stripped a bit. And for whatever reason, I have at least half a dozen flathead screwdrivers, in various sizes among the booth tools, but only one phillips head screwdriver - and its a relatively small one. So it was relatively useless to me.
I'll have to bring in some of my own tools to take that witch apart and see if my problem is only a loose cable!
And yes, I already opened up the soundrack and checked to see that everything was connected on that end!

~Gracia

------------------
In some cultures, what I do is considered normal.

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Brad Miller
Administrator

Posts: 17775
From: Plano, TX (36.2 miles NW of Rockwall)
Registered: May 99


 - posted 09-12-2000 03:33 AM      Profile for Brad Miller   Author's Homepage   Email Brad Miller       Edit/Delete Post 
Go ahead and change the bulb (assuming the existing one is properly seated) to rid yourself of that possibility.

I'm leaning more toward a bad card in the DA20 now. I think it's just about time for you to call the tech and have him hook up his scope and laptop to check the alignment and go from there.

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Cory Johnson
Film Handler

Posts: 46
From: La Crosse, WI USA
Registered: Aug 1999


 - posted 09-12-2000 10:24 PM      Profile for Cory Johnson   Email Cory Johnson   Send New Private Message       Edit/Delete Post 
Actually, this sounds exactly like the kind of problem that we experienced with our DA20 and CP 500, at about the same time interval you are looking at. We also had the SRD working great and all of a sudden, it would nt work, only displaying a - on the meter. We changed the bulb and it started working again. Another 6 months down the road and the same thing happened again. Again we replaced the bulb and it started to work again. Well after complaining the the techs about it, we finally got someone in there that tested the voltage to the digital reader bulb and found out it was set too high. He adjusted the voltage and the thing has run great ever since (over a year). If I were you, I would replace the bulb and get the voltage tested on the reader. (I think I should have guessed that ours would be flaky - for some reason, the dolby sticker is "upside down" on our reader from the factory. It must be a Dolby thing...)...

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John Walsh
Film God

Posts: 2490
From: Connecticut, USA, Earth, Milky Way
Registered: Oct 1999


 - posted 09-13-2000 10:47 AM      Profile for John Walsh   Email John Walsh   Send New Private Message       Edit/Delete Post 
Wasn't there a offical Dolby tech notice regarding the power supply in a CAT 700 soundhead?

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Aaron Sisemore
Flaming Ribs beat Reeses Peanut Butter Cups any day!

Posts: 3061
From: Rockwall TX USA
Registered: Sep 1999


 - posted 09-13-2000 12:43 PM      Profile for Aaron Sisemore   Email Aaron Sisemore   Send New Private Message       Edit/Delete Post 
Yes there were field bulletins for both thepower supplies in the DA20 AND the Cat 700. The older versions of both units are NOTORIOUS for having the molex connectors burn up, causing a complete failure of the power supply. There were noted on how to remove the molex and straight wire-wrap the lamp wiring on a 700 directly to the posts on the circuit board, provided the posts didnt get hot enough to burn themselves through the board. The DA20 bulletin recommended getting a replacement power supply cable with improved molex connectors, or if the posts were too far gone, to have the power supply replaced. I have had to repair fried molex connectors and/or power supplies on EVERY pre-1997 DA20 and Cat 700 in our inventory.

Aaron


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Marc Jones
Film Handler

Posts: 82
From: Elizabethtown, KY
Registered: Jun 99


 - posted 09-13-2000 07:15 PM      Profile for Marc Jones   Email Marc Jones   Send New Private Message       Edit/Delete Post 
One other question are you loading the CAT 700 correctly, ie the tensioning of the film around the sound drum.
Good Luck
Marc Jones

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Russ Kress
Expert Film Handler

Posts: 202
From: Charleston, WV, USA
Registered: May 2000


 - posted 09-14-2000 12:08 AM      Profile for Russ Kress   Author's Homepage   Email Russ Kress   Send New Private Message       Edit/Delete Post 
One thing to try.

Even though you are getting a dash, go ahead and press the "soft key" assigned to Dolby Digital on the processor (assuming you are using a CP-500).

You will either see a pop-up message saying "not ready" or "not available".

"Not ready" simply tells you what you already know. No digital data seen.

"Not available" means a hardware fault. Check to see if the fault leds on the two 671 cards being used for aquisition are lit.

If the 222SR/A is faulty or mis-seated, digital will indicate "not available" as well.

You can also call Dolby on the phone and ask for Lonnie. If he can't fix it, then it simply isn't broken! (LOL)

He also speaks every-day English!

A ten minute phone conversation with him equals about 10 credit hours <grin>.

Russ

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Gracia L. Babbidge
Jedi Master Film Handler

Posts: 709
From: Bowdoin, Maine
Registered: Aug 2000


 - posted 09-14-2000 12:20 AM      Profile for Gracia L. Babbidge   Author's Homepage   Email Gracia L. Babbidge   Send New Private Message       Edit/Delete Post 
First, thanks to everyone who offered input to help me out with my dilemma!

My SRD is working once again! :::does a happy dance:::
Here's what I did - (after bringing in my own, rather nice 2-in-1 screwdriver)
I had to loosen the bolts holding the electric changeover box, so I could move it enough to be out of my way. Then the back of the cat 700 was more accessible. Once I had the back off the cat 700, the problem was obvious. The cable that connects the reader to the processor had worked itself loose.

So after reconnecting the cable, and putting the rest of my machin back together, I tested it out by running our [generic] policy trailers on the machine. Granted, the policy trailers get used over and over and over and over, and as we have no film guard - the trailers are filthy. Even so, I got indication that the reader & processor are working...the first trailer bounced between an 8 and an F, the second one had a solid 7.
Hey, I'm just happy that it's working!

~Gracia

------------------
In some cultures, what I do is considered normal.

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Jon Bartow
Master Film Handler

Posts: 287
From: Massachusetts
Registered: Nov 1999


 - posted 09-22-2000 07:31 PM      Profile for Jon Bartow   Email Jon Bartow   Send New Private Message       Edit/Delete Post 
Gracia,
Greetings from Michigan!
In case you're interested, The DA20 that you have is about three years old. It was purchased used. The initial problem was the power supply connecting cable (the molex connectors were burnt) also the CAT700 lamp was set around 3.8 volts.
For anyone else who is interested the rack includes a DA20, CP200, and 4 Crown CE2000 amps.
Anyway, Hi Gracia and feel free to drop me a e-mail with any questions about your booth!
Jon

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