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Author Topic: Dolby Cat. 700 power supply Tim Johnson Film Handler Posts: 4 From: Wisconsin Rapids, WI, USA Registered: Aug 2002 posted 12-02-2007 01:02 PM                     Hi, I recently had a Dolby Cat. 700 power supply go out on me. It keeps blowing the fuse in the power supply after about 20 min. I contacted my supplier to get a new one and he was told by Dolby they longer make the power supply. I was wondering if anyone new were I could get a replacement or have the one I have fixed? Also is there a way to make your own power supply to replace the Dolby one? Is Dolby not making these anymore because they are concentrating more toward the Digital side and starting to get away from 35mm?  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 12-02-2007 01:10 PM                     Unless some area of the board have turned to charcoal these can usually be repaired. The repair of switching supplies is no secret and is pretty easy in fact! Also just to be sure its NOT the board check the Molex connectors as they sometimes burn up and become toasty looking and fail. If this is the case just eliminate the Molex's and solder the wires directly to the PCB. You'll have 100% reliability this way. Our company also converts the CAT 700 to red LED at a far more reasonable price than will Dolby. Mark  |  IP: Logged Tim Johnson Film Handler Posts: 4 From: Wisconsin Rapids, WI, USA Registered: Aug 2002 posted 12-02-2007 01:21 PM                     I'm pretty sure it is not the cable but I will check it the next time I am there. As far as the conversion to LED, would this require a different power supply and approx. what would the cost of this conversion be? Thanks  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 12-02-2007 05:12 PM                     Check all the white Molex connectors very carefully!! I tink it runs about $650.00 for the conversion. We use a different power supply and we custom machine a new mount so you can utilize the standard Dolby CAT 701/2 LED head. Mark  |  IP: Logged Tim Reed Better Projection Pays Posts: 5246 From: Northampton, PA Registered: Sep 1999 posted 12-02-2007 06:25 PM                       quote: Mark Gulbrandsen I tink it runs about $650.00 for the conversion.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 12-02-2007 07:54 PM                     OMG...why would anyone convert a Cat 700 to red LED? The lamp is cheaper, user changable and will track better than the LED based system. If you are truely desparate for the power supply, get a separate supply and just wire it up. I think the EPT lamp runs on 10.8V or so...there are many supplies that can power this thing. Steve  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 12-02-2007 08:12 PM                     quote: Steve Guttag OMG...why would anyone convert a Cat 700 to red LED? If you have a cracked light pipe as I have had (twice)its the only option.. ok... or the garbage can... since Dolby has no light pipes. We were quoted $1200.00 by Dolby for them to do the conversion so I think our price is more than fair.  |  IP: Logged Sam D. Chavez Film God Posts: 2153 From: Martinez, CA USA Registered: Aug 2003 posted 12-02-2007 08:31 PM                       I bought a couple of these power supplies, last batch from Dolby. Nothing special but easy to install.  |  IP: Logged Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 12-02-2007 11:07 PM                     quote: Steve Guttag I think the EPT lamp runs on 10.8V or so...there are many supplies that can power this thing. We have a wad of old Kelmar exciter bulb PS units that has the possibility to be the replacement PS for these units since they do put out a good amount of adjustable DC voltage and amperage run to power those bulbs. Yet, this is also on my mind since I do take care of a 6plex that has 4-CAT700 units as well...and I've had to replace PS units in two of them... [ 12-03-2007, 02:24 AM: Message edited by: Monte L Fullmer ]  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 12-04-2007 05:06 AM                        How do light pipes go bad? Louis  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 12-04-2007 08:20 AM                     quote: Louis Bornwasser How do light pipes go bad? Louis I had two failures... One was scratched(more like a tiny chip out of the end) on the end that sits behind the film... another pipe's glass rod was cracked internally. Both resulted in extremely uneven light across the scanned area and very high error rates, the internally cracked one wouldn't even exhibit a usable video waveform... it was grossly distorted. We sent the one with the scratched surface to an optical guy at Hill AFB and he tried to polish the surface... he had some luck with it and it was better after the polishing but still not gooed enough to produce low tracking rates.... Both got converted to LED... I used the small C.E. supply to power the LED on both of them. Both also use the standard Dolby LED head. Mark  |  IP: Logged

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