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

» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » Help in repairing ORC rectifer

Author Topic: Help in repairing ORC rectifer Luther M. Spencer Film Handler Posts: 33 From: North Charleston,SC, USA Registered: Apr 2000 posted 07-05-2000 11:14 AM                     Hello...I hope some one can help me...I have an Orc 1600 watt rectifer..that I have been working on,,,I finialy found the trouble...You couldn't control the Amperage....when you turned on the Lamp it pegged the amp meter...and wouldn't drop back..and the Pot control wouln't do anything....I first checked the Pot. It was within tolerance...100 ohms....I then figured it must be in the regulator transistor stack....9 hight current 2N4276's/NTE 27's in a row,,on a very large heat sink....controled by the pot.I took the regulator stack from a working Powewr supply and it cured the problem,,,,I then desoldered the transistors and checked each one ..One at a time..they were all shorted out....my problem is,,,I found the transistors from a local electronics house and theywere $37.00 each..times nine....That'over $300 for the stack...Does anyone know a cheaper source...Maybe a surplus house....Please help..Maybe some one has an old unit with the transistor stack..or maybe the transistors....again 2N4276 or ECG27 or NTE27....Thanks...MIKE  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 07-05-2000 11:20 AM                     The cost and availablity problems of that particular ORC rectifier are one of the reasons why there are so many of them for sale cheap  |  IP: Logged Ken Layton Phenomenal Film Handler Posts: 1452 From: Olympia, Wash. USA Registered: Sep 1999 posted 07-05-2000 08:30 PM                     Try Mouser Electronics at www.mouser.com and ask for the catalog.  |  IP: Logged Josh Jones Redhat Posts: 1207 From: Plano, TX Registered: Apr 2000 posted 07-06-2000 03:19 AM                        Well, If all else fails, you could replace the whole stack with cheap 2n3055's or MJ2955's(PNP) that way you'd replace the whole stack for $18 Sorry, Josh "Show me a mouse, and I'll show you a cat with bad breath" Garfield  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 07-06-2000 03:44 PM                     The regulator circuit and load sharing will not handle the inrush of ignition except with the original germanium stack been there tried that  |  IP: Logged Josh Jones Redhat Posts: 1207 From: Plano, TX Registered: Apr 2000 posted 07-06-2000 11:50 PM                        Gordon, couldn't you add 2 or 3 more transistors to lessen the inrush current through each device? If you have space, that would be an option in my book. Josh  |  IP: Logged Luther M. Spencer Film Handler Posts: 33 From: North Charleston,SC, USA Registered: Apr 2000 posted 07-07-2000 11:57 AM                     Thanks ....I guess I will reside myself to the higher priced Units...Mike  |  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.