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Author Topic: Xenex lamp problem Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 10-14-2009 08:37 PM                     Okay. So I swapped the RA relay and still no good. Looks like the low voltage, like a couple of you guys said, WAS the problem. I swapped the staring cap between 2 screens and that was the problem. Originally I was getting 76 volts. With the one I swapped, I was getting 84 volts. It seems that the 8 volts was the difference. I put the bad cap into the other screen and it's doing the same thing. Thanks for all your help guys.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 10-14-2009 09:23 PM                     Glad you found the problem! Whats interesting about these older rectifiers is if you have them in an area that's prone to brown outs then your lamp striking problems happen all over again. AC voltage sags and so does the DC!! Thats another reason for installing the Neumade booster box. Mark  |  IP: Logged Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 10-15-2009 09:19 PM                     That may be why they have some striking issues in the summertime.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 10-16-2009 11:24 AM                     No doubt there! I had those troubles at the same time of the year. The booster is about 500 bucks list... The thing that was happenning at the theaters I had troubles at was that the ignotors would eventually fail fomr attempting to strike so many times. Now Irem Ignotors cost way more than a booster does which is another reason we went the booster route. You'd have to see if Neumade still has any, ar ethey even still in buisness?. I probably still have the schematic if they are gone. They would be easy to build. I saw you are loooking for an autostrike board... They are easy to build! One 48 vdc coil relay and an appropriate zener try (54 volt +/-) in series with the relay's coil. N.O. contacts wired across the manual start button... Mark  |  IP: Logged Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 10-16-2009 12:44 PM                     Thanks Mark. So let me get this straight. N.O. across the manual ignition button. I'm assuming that the relay coil terminals go to the rectifier + and -. Does the zener go across the coil terminals or inline with the + coil terminal?  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 10-17-2009 02:54 PM                     Zener goes in line with the coil... Rectifier reaches a certain voltage and the zener conducts... lamp lights then voltage drops and zener no longer conducts.  |  IP: Logged Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 10-17-2009 04:54 PM                     Thanks Mark. The bad cap was all faded and I couldn't read the specs. I found a few at home that are the same size. Do you know if these are the right specs....... 4200 uf 75VDC max surge 95VDC Thanks again  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 10-17-2009 11:46 PM                     They will probably work because I don't think the DC no load will exceed the capacitors surge voltage rating and most electrolytics like that are +/- 20% on the rating. 4700 uf is correct at least for the larger Irem rectifiers but they spec 160 volts DC rating... the new Irems do have about 130 volts no load!! Install one and just to be safe measure the no load DC just to be sure it doesn't go over the 75 volt rating by more then a few volts. If it does I reccomend a larger DC voltage rating and same capacitance. Mark  |  IP: Logged Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 10-20-2009 08:10 PM                     Thanks again everyone. That was the correct cap. All is fine now.  |  IP: Logged

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