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This topic comprises 2 pages: 1 2
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Author
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Topic: DA20 problems
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Jon Bartow
Master Film Handler
Posts: 287
From: Massachusetts
Registered: Nov 1999
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posted 02-23-2000 08:02 PM
I recently opened a new 10 screen theater. Due to budget constraints we purchased used booth equipment. We have ORC lamphouses with ORC VA-301 automations.
The projector in question is a 3k lamp, Century JJ-2 projector with a Cat. 700 digital reader. The sound rack includes: CP200, SR-A5, DA20, Crown CE2000 Amps. Ever since the install the DA20/CP200 combo has not worked properly. Originally the only problem seemed to be that the DA-20 and the CP200 were not talking. (i.e. the system would not engage the digital.) I could engage the digital manually by turning the pot on the CP sense card in the DA-20. Then the DA-20 went really haywire. Lights flikering all over the place, etc. Replaced the FRED card. still didn't work (same problem, lights flickering, etc.) Went over all of the modifications to the CP200 for the 2000th time and all of the cables connecting the two. Finally found a problem. The CP sense control wires (connected the the lowest DB25 port on the back of the DA-20 and to the back of the main circuit card in the upper half of the CP20) were installed backwards. After correcting this problem the system seemed to work perfectly for 24 hours. Then, the next day, similar problem. All of the fault lights come on on the DSP cards, the FRED card has no numeric display (FRED fault light is on), the AC-3 card fault light blinks, the motor/projector lights are all correct (proj 1), and a few of the Digital signal level lights come on.
Completely disconnecting the DA-20 has no effect. It still will not load the Base-line code.
Is it another Bad FRED card? Or the AC-3 card?
I am at a complete loss. Dolby refuses to return my calls.
Any ideas would be greatly appreciated.
thanks
Jon
jbartow@megalink.net
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Trevor Bailey
Expert Film Handler
Posts: 113
From: Woonsocket, RI
Registered: Jun 99
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posted 02-25-2000 03:52 PM
Hey Jon,You may have already checked this, but I know that the DA-20 has had some power supply issues in early units. Have you checked your voltages on the CAT 670 card. I believe TP5 should be +15v, TP8 should be -15v, and TP6 should be +5v. Ken/Lonny @ Dolby have told me that your reading should not be off by more than 20%(?). If it is, you should check the power supply molex connectors. Good luck! BTW, Bud and I both spoke w/ Andrew on Wed about the relays for N. Bedford. Later,
Trevor
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Brad Miller
Administrator
Posts: 17775
From: Plano, TX (36.2 miles NW of Rockwall)
Registered: May 99
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posted 02-26-2000 07:07 PM
Gee Joe, thanks for the tip, but a DA20 is a model number for a Dolby Digital processor and is not a model number for an SDDS processor, so the baseball bat should not be used except for model numbers starting with DFP.Jon, turn off the power to the DA20, set that card to number "7", then repower it back up. Then, dial up format "10" on the CP-200 control unit. Let me know if that works. Personally, I hate the idea of "auto-digital". I don't want the DA20 "taking over" (like SDDS does) my system and forcing it to play in digital. If I want it to play in SR, I'll select format 05. If I want it to play in digital whenever it is present, I'll select format 10. Simple as that. Enough of the "auto" crap!
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Lonny Jennings
Film Handler
Posts: 10
From: Boston, MA USA
Registered: Feb 2000
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posted 02-29-2000 05:05 PM
Jon: You have the older Cat. No. 611 not the "A" variant. The correct position is "3" for that card with the CP200. The "haywire" response you got from the DA20 when you selected another CP position is correct because the unused switch positions on that card are programmed to do that to let you know that you are not on a valid position. I believe that you have a bad power supply connector that is causing the lockup situation you have. Where did this unit come from originally?If you could call us here at 415-645-5000 we'd be happy to help you with this problem. Lonny Jennings P.S. For those of you with the newer Cat. No. 611A, you can always turn off the autodigital by selecting the the switch position number that is normally used +4. In other words, to select user control only of digital for the CP200 select (3) + 4 = 7. This will give you digital ONLY when you select it from the CP.
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Aaron Sisemore
Flaming Ribs beat Reeses Peanut Butter Cups any day!
Posts: 3061
From: Rockwall TX USA
Registered: Sep 1999
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posted 02-29-2000 08:49 PM
Welcome to the forums, Lonny!Your sage advice has been missed. See ya at the Dolby booth next week! -Aaron
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Trevor Bailey
Expert Film Handler
Posts: 113
From: Woonsocket, RI
Registered: Jun 99
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posted 03-01-2000 12:02 PM
I haven't done one in a while...so if I'm a little off, I'm sure Lonny will set us right.Unscrew the power supply on the back of the DA-20 and disconnect the cable from the main chassis. Open up the power supply and the wires should go into a molex connector. Does it look discolored? The last time I looked at one, the connector was brown. I soldered the wires directly to the PCB and that worked for a few months. Eventually it failed (just like the guys at Dolby told me it would) and the theater had to order a replacement. Hope this helps! BTW, did you take care of that intermittent and motor in Cin. 7 at N. Bedford? Later,
Trevor
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) just to see what would happen. What is supposed to happen is that all of the fault lights come on and a "U" is displayed on the FRED card. No "U" with any of them except one of the DSP cards (but not the other). What do you think Brad? Get rid of the CP200/DA20/SRA5 and get a CP500? 
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