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Author Topic: lamp issue on a Barco DP-100 Demetris Thoupis Phenomenal Film Handler Posts: 1240 From: Aradippou, Larnaca, Cyprus Registered: Apr 2001 posted 02-21-2010 02:40 PM                     Joe what you mentioned above reminded me of a problematic xenon supply giving a no load of 40 V dc and it did exactly what you mention. It could ignite the lamp at first but not if switched off and then on again. I fixed the rectifier and giving 90 volt no load and after that every time ignited fine. this was standard cinema lamps 2 k. I still thing you should check the no load voltage to rule the LPS out. Demetris  |  IP: Logged Eric Robinson Jedi Master Film Handler Posts: 538 From: Santa Rosa, CA Registered: Jan 2005 posted 02-24-2010 12:10 AM                     If you have more than one DP100, you could start swapping assemblies starting with the lamp house first.  |  IP: Logged Joe Elliott Master Film Handler Posts: 497 From: Port Orange, Fl USA Registered: Oct 2006 posted 02-24-2010 05:45 AM                     Well, I wasn't able to get a no-load voltage reading Sunday night, as my meter apparently got wet in the trunk of my car, and was not working properly. I did however swap the polarity as we met criteria 1 of that bulletin. I then tried in vain to get the lamp to not strike. It struck first time every time, even when hot (I know not good to strike it hot, but I was trying to get it to act up). I agree that there maybe something wrong with the LPS because of the random nature of it before, and I will be watching it closely, as I am a skeptic when it comes to any repair. That seems, however, to have solved some of our major problems with it. Should I have any further problems, or find out anything else on this I will update this post for posterity.  |  IP: Logged John Hawkinson Film God Posts: 2273 From: Cambridge, MA, USA Registered: Feb 2002 posted 02-27-2010 11:06 PM                     Xenon bulbs require significantly more no-load voltage to strike when they are warm. Look at Osram's tech guide for the numbers for a 6k. For a 2k, it's something like 80V nominal striking cold and 120V striking hot. Most people think striking a bulb and then turning it off dramatically reduces its lifetime, and is a bad practice. But YMMV. If your bulbs fail for some reason other than electrode wear/shaping, then its probably irrelevant for you. --jhawk --jhawk  |  IP: Logged Joe Elliott Master Film Handler Posts: 497 From: Port Orange, Fl USA Registered: Oct 2006 posted 09-16-2010 03:02 AM                     Just as an update to this, since the polarity swap, the bulbs now strike the first time every time. It has been 8 months now, and not a single problem with them striking, including going back through our bulbs that had to be taken out because they wouldn't strike after running for 200 to 300 hours.  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 09-16-2010 04:57 AM                     It's hard to believe that such a clear issue and solution is not communicated STRONGer from the manufacturer to the users. Did that Techbulletin reach you at all? - Carsten  |  IP: Logged Joe Elliott Master Film Handler Posts: 497 From: Port Orange, Fl USA Registered: Oct 2006 posted 09-17-2010 10:16 PM                     Nope. But our projector is (as stated by the Barco engineers), is a pre-production unit. It needed several retrofit kits (see the bulb mount on page one of this post, for example) to solve issues that had been corrected by the time the projector hit full production. At the time the company bought it also, only the technicians were allowed access to Barco's web site. We changed our digital PM contracts from Strong to Christie, as most of the digitals in our chain where Christies. The Strong reps had access to the info, the Christie guys were still all going through training for it, and neither group had more that 1 or 2 other Barco's in all of Florida, so they did not have to deal with them often. It wasn't until I was working with the Barco Engineers on another issue, that they gave me access to the site. I guess at sometime previous to this they opened up access for all theaters, but again, that info did not filter down to us. It was about 2 weeks after I posted that, and Hendarto mentioned that bulletin that I got access and was able to see the bulletins. The bulletins also allowed me to solve a couple of other minor issues too.  |  IP: Logged System Notices Forum Watchdog / Soup Nazi Posts: 215 Registered: Apr 2004 posted 12-21-2019 04:06 AM                 It has been 3381 days since the last post.  |  IP: Logged Juan Jose Garcia Calvo Film Handler Posts: 64 From: Pedrajas de San Esteban, Spain Registered: May 2003 posted 12-21-2019 04:06 AM                     Hello. I know this is an old post, but now we are experiencing striking issues on our Barco DP3000 and I can't access to the technical info at barco website, I wondering if someone can let me read the technical bulletin from barco about the trick of swaping cables in the SPG or any other similar to see if there is something to do. All these year we used 3000W lamps in our DP3000, but 2 years ago I brought 2 units of new (old stock) 4000W Osram Classic Line lamps (only 1.000hours lasting lamps) at very good price. Once installed last year, when the lamp was 500h old, the striking problems appears: Sometimes start in the first try, other it need push 10 times (4 strikes each) lamp on button. I know Osram lamps have these problems, but maybe there is anything I can do to continue using this lamp. I have a doubt about what happens if you put multiple "lamp on" cues in a show: If lamp is already on, do SPG new discharges or maybe the projector, knowing that lamp is already on, refuses to give new strikes to the lamp? Thanks  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 12-21-2019 07:09 AM                     The projector is smart enough to know when the lamp is on and won't actually strike again. - Carsten  |  IP: Logged

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