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Author Topic: Lamp keeps switching off in ORC Lamphouse Joe Redifer You need a beating today Posts: 12859 From: Denver, Colorado Registered: May 99 posted 06-03-2003 02:38 AM                        I have an ORC lamphouse (brown & beige version)where the 2000 watt lamp shuts off after ten minutes, almost like clockwork. It's not the feather switch for the blower and it's not the door switch. Even with all the panels removed the rectifier stays cool, but the lamp shuts off. New bulb, by the way... and it did it on old bulbs, too. Once the bulb shuts itself off, it cannot be struck again for a few minutes. Once I hear a light "click" sound from the rectifier (where the capacitors are) the lamp can be struck again. I don't see a relay over there. Sounds kinda like a capacitor problem but I don't know what is making the click when it is OK again. Any ideas on solutions?  |  IP: Logged Adam Martin I'm not even gonna point out the irony. Posts: 3686 From: Dallas, TX Registered: Nov 2000 posted 06-03-2003 04:13 AM                     Are there temperature sensors on the heat sinks in the rectifier? If so, try replacing or bypassing them to see if a faulty sensor is your problem.  |  IP: Logged Fabrice Dubourg Film Handler Posts: 43 From: Granville, France Registered: Feb 2003 posted 06-03-2003 04:55 AM                     Excessive heat on the positive heatsink normally open a thermal switch and cut power from k1 coil to allow unit to cool before restarting. is there a problem with the rectifier cooling fan ?  |  IP: Logged Ken Layton Phenomenal Film Handler Posts: 1452 From: Olympia, Wash. USA Registered: Sep 1999 posted 06-03-2003 09:35 AM                     Some ORC's have a keyswitch in the snout of the lamphouse that causes problems. Either the switch goes bad, gets out of adjustment, or the connector pins to it go bad (they spread apart under heat) This switch is in series with the air vane switch if I rember correctly.  |  IP: Logged Tim Reed Better Projection Pays Posts: 5246 From: Northampton, PA Registered: Sep 1999 posted 06-03-2003 11:39 AM                       The time factor sure makes it sound like a thermal switch is at fault. Not that I had to reiterate what Adam and Fabrice already said, but I just want to increase my post count.  |  IP: Logged Joe Redifer You need a beating today Posts: 12859 From: Denver, Colorado Registered: May 99 posted 06-03-2003 03:09 PM                        Yup. That was it. Thanks.  |  IP: Logged Tim Reed Better Projection Pays Posts: 5246 From: Northampton, PA Registered: Sep 1999 posted 06-03-2003 07:46 PM                       You're sure welcome, Joe! Hey, btw, a print of my intermission clock is going to the Cinderella Twin in Denver. You'll have to stop by and see your name on the screen!  |  IP: Logged Adam Martin I'm not even gonna point out the irony. Posts: 3686 From: Dallas, TX Registered: Nov 2000 posted 06-03-2003 10:22 PM                     Joe's name is Cinderella?  |  IP: Logged Joe Redifer You need a beating today Posts: 12859 From: Denver, Colorado Registered: May 99 posted 06-03-2003 11:01 PM                        Wo! That's not far from where I live. You serious?  |  IP: Logged Tim Reed Better Projection Pays Posts: 5246 From: Northampton, PA Registered: Sep 1999 posted 06-04-2003 12:34 AM                       Yeah, I told you I'd give you a screen credit for helping with the demo transfer last year.  |  IP: Logged Philippe Laude Film Handler Posts: 79 From: Longueville, Belgium Registered: Jul 99 posted 06-04-2003 03:30 AM                     Another effort Tim, you're almost at 1000!  |  IP: Logged Tim Reed Better Projection Pays Posts: 5246 From: Northampton, PA Registered: Sep 1999 posted 06-04-2003 10:19 AM                       Philippe, I'm sure trying!  |  IP: Logged Scott Norwood Film God Posts: 8146 From: Boston, MA. USA (1774.21 miles northeast of Dallas) Registered: Jun 99 posted 06-04-2003 12:39 PM                        I see that Herb got a screen credit too! (now back to your regularly scheduled on-topic posts)  |  IP: Logged Tim Reed Better Projection Pays Posts: 5246 From: Northampton, PA Registered: Sep 1999 posted 06-04-2003 05:43 PM                       Oh, you're right, Scott. Did I mention the real problem is that it's an ORC?  |  IP: Logged Sam Hunter Jedi Master Film Handler Posts: 779 From: West Monroe, LA, USA Registered: Jan 2002 posted 06-04-2003 09:43 PM                     quote: Did I mention the real problem is that it's an ORC? That hurt, I like my ORC  |  IP: Logged

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