my profile | my password | search | faq & rules | forum home

» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » Bulb ignition Problem.

Author Topic: Bulb ignition Problem. Jack Culpepper Film Handler Posts: 18 From: Gulfport, MS, USA Registered: Jan 2001 posted 01-26-2004 11:16 AM                     I have just had my ORC 2500 Lamphouse and rectifier refurbished. It now seems to be working perfectly. It pulls the required 55 - 70 amps. Screen and image brightnes are perfect. The problem is that I have CANRAD-HANOVIA 1600 watt bulb that is starting to darken. I figured its time to replace the bulb. I bought an OSRAM 1600 Watt HS-OFR bulb. I replaced the old canrad-hanovia bulb with the new bulb and turned on the lamphouse. Nothing happens. The new bulb will not ignite. I put the old bulb back in and everything works perfectly. The old bulb ignites as it should. I have gone through this process a number of times and with three new bulbs each time. BOTTOM LINE; The old bulb ignites as it should and the new osram bulbs do not. ANY IDEAS AND/OR HELP WOULD BE GREATLY APPRECIATED.  |  IP: Logged Rick Long Jr Expert Film Handler Posts: 211 From: Toronto, Canada Registered: Jul 2000 posted 01-26-2004 11:50 AM                     Weird. Is it just sitting there dead, or is the ignitor firing? if so, it could be that the new bulb is positioned too far back in the reflector and the spark is jumping to groung. Try adjusting the bulb focus control all the way one way or another. It could be that the end caps are different enough between the bulbs that this could be the cause.  |  IP: Logged Paul G. Thompson The Weenie Man Posts: 4718 From: Mount Vernon WA USA Registered: Nov 2000 posted 01-26-2004 07:27 PM                     You probably got an Osram that was Dead On Arrival. Seen it happen.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 01-26-2004 07:32 PM                     Still the ignitor should attempt to fire One of the things I see a lot of is it didn't work or didn't light being used a few more details really should be added always such as ignitor attempted to fire (heard spark gap ) no flash in lamp and it didn't light or similar  |  IP: Logged Jean-Michel Grin Expert Film Handler Posts: 222 From: Geneva & Lausanne, Switzerland Registered: Jul 2002 posted 01-30-2004 05:07 PM                        Do you use an "automatic" DC Igniter ? Maybe the No Load voltage is too low.. It's happend to me with a hight reactance Strong's rectifier.  |  IP: Logged Matt Zeiner Expert Film Handler Posts: 146 From: Windsor, CT USA Registered: Sep 2003 posted 01-30-2004 07:04 PM                     the 2500 has integral rectifier, no? I beleive there is a separate boost circuit to jack the no-load voltage up - have found open resistors in there, but this is something else most likely. are the bulb ends making good contact? try jumping out the microswitch that closes when the lid is put on...very strange indeed.  |  IP: Logged Darryl Spicer Film God Posts: 3250 From: Lexington, KY, USA Registered: Dec 2000 posted 01-30-2004 07:11 PM                    Well, I would think that the bulb should be good. If it wasn't there would still be a spark across the gap. Maybe the igniter is not putting out enough voltage to Send a spark across the gap. Sort of strange situation but I would check and make sure that the voltage is pegging above 100VDC.  |  IP: Logged

All times are Central (GMT -6:00)

Printer-friendly view of this topic

Hop To: Select a Forum: Category: Operations -------------------- Digital Cinema Forum Film Handlers' Forum Large Format Forum Ground Level Feature Info, Trailer Attachments & REAL Credit Offsets Category: Community -------------------- Film-Yak Film Handlers' Movie Reviews The Afterlife Bob Maar's Joke-A-Thon Category: Classified -------------------- Equipment and Supplies Wanted/For Sale Help Wanted/Seeking Employment Category: System -------------------- Software Beta Testing Forum

The Film-Tech Forums are designed for various members related to the cinema industry to express their opinions, viewpoints and testimonials on various products, services and events based upon speculation, personal knowledge and factual information through use, therefore all views represented here allow no liability upon the publishers of this web site and the owners of said views assume no liability for any ill will resulting from these postings. The posts made here are for educational as well as entertainment purposes and as such anyone viewing this portion of the website must accept these views as statements of the author of that opinion and agrees to release the authors from any and all liability.