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This topic comprises 2 pages: 1 2
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Author
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Topic: DTS woes
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John Walsh
Film God
Posts: 2490
From: Connecticut, USA, Earth, Milky Way
Registered: Oct 1999
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posted 06-17-2000 11:21 PM
Only thing I can suggest is:At our theater, we originally put in just a CP65 (no digital) in one house. Then, we put use a Xetron cue detector with reflective cues on the film to "tell" the automation what to do. We have cues one thru eight. For example, a "six" cue (six reflective cues one frame apart) is; go to "scope" and analog "SR." OK, so then we added a DTS 6D (three drawer) unit. When it detects DTS timecode, and the right disks are in, it automatically switches the CP65 to "digital." We were glad it did it by itself, because we didn't have to wire up the cue detector to do it. The problem was that people kept putting cues on the film, shortly after the actual feature had started (about 3 feet in.) What was happening was:
the film would run in mono (for ads);
then the timecode went through and switched the CP65 to "digital."
Then the cues would go through and set the CP65 back to analog SR, and run the rest of the show that way. It looked like a fault, but it was only doing what it was told.
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Tom Ferreira
Expert Film Handler
Posts: 203
From: Conway, NH, USA
Registered: Jun 99
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posted 06-18-2000 07:33 AM
I am also having a DTS problem similar to Scott's. The DTS will run through fine at times(6D Unit, Smart Processor), but at other times, it will drop out and switch to analog. The system light is flashing, but the light on the reader goes on and off. I called DTS Tech support-they said to check the grounding on the reader(not the problem),the tension(already had tried that), and as a last resort, peel the sticker off the reader and adjust the reader. Has anyone done this? Until I find a solution, I'm running analog.
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John Walsh
Film God
Posts: 2490
From: Connecticut, USA, Earth, Milky Way
Registered: Oct 1999
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posted 06-18-2000 07:48 AM
We had a thunderstorm near us last night (here in CT.) Maybe you got one, too?At different theaters, a power glitch would have a different effect. At one place I worked, the projectors would stop, but at another a similar glitch would only bring up all the house lights. I still can't figure out the LED right on the CD ROM itself. I know it's blinks while being read. But, when it's not being used- sometimes it's on (steady), sometimes it's off. Is there anyway to tell what kind of drive (TDK, etc.) it is without taking it apart? I probably would have taken the chance and pressed "digital" on the CP65 and/or even rebooted the DTS unit. It is pretty reliable, but if worst came to worst, you could fallback to emergency. It's not that I want the patrons to suffer, but (at my theater) if it doesn't get fixed or at least fully 'documented', it will stay that way until I work again a week later. So, even more people will suffer. I wouldn't take that policy to an extreme, but the DTS/ Dolby combo is pretty reliable. I bet it burns Dolby's butt to have you press, "Dolby Stereo Digital" to switch in a DTS unit.
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Stefan Scholz
Expert Film Handler
Posts: 223
From: Schoenberg, Germany
Registered: Sep 1999
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posted 06-20-2000 11:11 AM
I have had always problems with my 1993 reader, board rev B. It is already one of those sealed types, and changing lateral alignment did not help.The LED might have died, according to the schematics, there's a compensation feedback loop to accomodate for density changes, which should at least help for a while. My first attempt was to change the LED, it's a standard red 3 mm Hi Briteness LED. It's little difficult to do,but worth trying first.
The unit always worked fine with Jurassic Parc.
Later I got tired of the problem, and tried more research. I found some films, where the noiseless shutter was acting within the DTS area, therefore getting the density contol circuitry out of lock. I modified the pure analog circuit to a standard positive feedback comparator, and since that oabout 90 % of the reels run oK. The other projectors use rev. readers, which never gave problems.
#It's such a simple, theoreticly reliable, system. But beware of readers older than rev. B. The rev can be seen on the PCBunderneath the connecting plug .
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