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Author Topic: Dolby digital reader needing adjustment? Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 03-13-2018 05:36 PM                     CAT701 units has that self contained power supply were we had to tweak up the current on the LED to get the error count down. I've used exciter power supplies to replace the ones for the CAT699 and 700 units being we're just dealing with a small projector lamp. But, using WinDRAS, it helped also to get the alignment checked, if one doesn't have an "O-scope" to really fine tune in the camera.  |  IP: Logged Sean McKinnon Phenomenal Film Handler Posts: 1712 From: Peabody Massachusetts Registered: Sep 2000 posted 03-16-2018 07:53 AM                        quote: Sam D. Chavez How many new 650's you have in stock? Sam, We have a few here NOS in the original boxes. Never opened  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 03-16-2018 09:20 AM                        WIN DRAS is only for final tweaking. Oscope is the only way. Frankly, we had a technique for just doing it the old fashioned by-eye way that always resulted in audio; a great place to start.  |  IP: Logged Sam D. Chavez Film God Posts: 2153 From: Martinez, CA USA Registered: Aug 2003 posted 03-16-2018 10:14 AM                       Hi Sean, You do know where those 650's came from?  |  IP: Logged Sean McKinnon Phenomenal Film Handler Posts: 1712 From: Peabody Massachusetts Registered: Sep 2000 posted 03-16-2018 12:01 PM                        I do that's why I added the  |  IP: Logged Randy Stankey Film God Posts: 6539 From: Erie, Pennsylvania Registered: Jun 99 posted 03-16-2018 02:45 PM                     quote: Louis Bornwasser WIN DRAS is only for final tweaking. Oscope is the only way. AFAIAC, WIN DRAS is nothing more than a display or an indicator. I would often have the computer and the oscilloscope connected at the same time and bounce back and forth between looking at DRAS and the scope, making adjustments until I got things running just the way I wanted them to. The nice thing about DRAS is that it has the bar graph that shows the history of how well it has been operating over the last several minutes. I would often turn on DRAS and leave it running during a whole movie then come back later to see how well (or badly) the unit behaved in a real-world test. So, yes, DRAS is a tool you can use to tune up your Dolby Digital unit but it is not the only tool in your tool box, nor should you treat it as such.  |  IP: Logged Sam D. Chavez Film God Posts: 2153 From: Martinez, CA USA Registered: Aug 2003 posted 03-16-2018 05:26 PM                       DRAS only works when the reader is actually working more or less normally. If you are trying to adjust things and it goes too far off it will quit displaying and then you're in the dark and time for the scope.  |  IP: Logged Garry Knapp Film Handler Posts: 50 From: Mississauga Ontario Canada Registered: Oct 2016 posted 03-25-2018 06:50 AM                        Anyone have a any LEDs for sale for the Vic5 basement readers? Thinking its a good idea to have set...  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 03-26-2018 10:11 AM                        Low numbers are good/high are bad. That said, stability is even more important. I have seen steady 4-5-6 for years with no problems. Lots depends upon the mechanical integrity of the driving projector as well as optimal set up. Is there any bearing oiling on the V5?  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 03-27-2018 09:21 AM                     some versions of the cinemecanica did have a oil hole in the centre of the shaft bracket located between the inner bell and the flywheel  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 03-27-2018 11:29 AM                     Perfect for getting oil all over the stereo pickups... Mark  |  IP: Logged Garry Knapp Film Handler Posts: 50 From: Mississauga Ontario Canada Registered: Oct 2016 posted 03-27-2018 07:36 PM                        This one doesn't. One more question then, along this same thread.. How many channels does an oscilloscope need to read the audio output? I've heard this from day-one, that a scope was needed. I'm not afraid of going this route as I could surely use the scope for other purposes...  |  IP: Logged Sam D. Chavez Film God Posts: 2153 From: Martinez, CA USA Registered: Aug 2003 posted 03-27-2018 10:53 PM                       2 channel with X/Y capability. You need fairly high res as solid state screens are relatively slow compared to CRT phosphor displays.  |  IP: Logged Sean McKinnon Phenomenal Film Handler Posts: 1712 From: Peabody Massachusetts Registered: Sep 2000 posted 03-28-2018 05:20 PM                        Your actually not reading an audio output its a video output from a CCD. The DD reader takes a picture of the area between the sprocket holes and sends that picture to the DA-20/Cp500 DA 20 subsection or CP-650 which decodes the clear and black squares from the picture into digital data (ones and zeros). I prefer an analog CRT for this and it needs to be at least a 20 Mhz scope. (I think its 20 but I have to double check)  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 03-29-2018 09:46 AM                     You need a dual channel 20Mhz scope that does X/Y mode If the drum doesnt have the oil hole then the unit has sealed ball bearings (one of the later) Mark pray tell me how oil will find its way to the cell or lens it isn't possible  |  IP: Logged

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