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Author Topic: NEC 1200 Lamp issue Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 05-01-2013 09:48 AM                     On this particular projector, the lamp power has been fluctuating from day to day. One day it's 73%, the next day it's 86%. Lamp has 1900 hours on it and looks fine. No flicker. Feedback sensor is disabled. Only one movie is playing so it's not a memory issue.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 05-01-2013 03:01 PM                     probably either a ustable lamp or the connections between the lamp and the LPS are having issues what make of lamp  |  IP: Logged Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 05-01-2013 04:48 PM                     Ushio UXL-20  |  IP: Logged Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 05-01-2013 05:26 PM                     I have a 2500 running a 4K lamp that does the same with slight fluctuating amperages, yet no screen issues. I don't pay any attention to it due to being a xenon bulb where they have their own mind on how they want to run each day. It also could be your power coming in the building having slight voltage variables were the rectifier amplifies the variables on the DC output. On the three phase tap in the unit, take a VOM and touch red on each leg and black on chassis to see how each 120V leg is doing. Then red on one leg and black on the other leg to see how the 208V voltage is doing.  |  IP: Logged Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 05-01-2013 06:01 PM                     Good point Monte. I'll check the voltage.  |  IP: Logged Tony Bandiera Jr Film God Posts: 3067 From: Moreland Idaho Registered: Apr 2004 posted 05-01-2013 06:53 PM                     quote: On the three phase tap in the unit, take a VOM and touch red on each leg and black on chassis to see how each 120V leg is doing. Then red on one leg and black on the other leg to see how the 208V voltage is doing. Whoa up there!! Do NOT EVER do what I highlighted!! In the event that the projector is not properly grounded, even the voltage and current passed thru a typical VOM can damage the projector electronics. When taking AC line voltage measurements, check at the receptacle or panel and use either a proper neutral terminal or proper ground terminal. Better to be safe in this case.  |  IP: Logged Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 05-01-2013 08:37 PM                     Thx, Tony for the help. Should have said, black on Green earth just in case the case isn't grounded.  |  IP: Logged Tony Bandiera Jr Film God Posts: 3067 From: Moreland Idaho Registered: Apr 2004 posted 05-01-2013 09:10 PM                     Monte, I hope the tone of that post wasn't as harsh as it looks to me now, I did not in any way intend to impugn your skills. The advice to check voltages was sound. I have found out the hard way (thankfully with a much-less expensive consumer-grade projector) what happens when you use the chassis when measuring line voltages. Luckily the damage wasn't too bad or expensive to fix. Now, like all rules, there are exceptions....many of the low-voltage test points in a lot of gear does indeed use the chassis as "ground" or "reference" so in those cases your advice was spot-on.  |  IP: Logged Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 05-02-2013 12:29 AM                     Thx again, Tony. For that is what we are all on here for: to help each other out and get us all pointed in the right direction to where we need to arrive at. Also, going to mention to Richard, that the xenon bulb is like a big ol' resistor that glows when DC current is passing from one end to the other ... and it's going to act slightly different each day as it ages as the gap between the anode and cathode wears down. thx- Monte  |  IP: Logged

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