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Author Topic: Replacing blown diodes on Christies Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 03-30-2006 02:41 PM                        4 or 5 post above: Mark said 140 amp-1600 piv diodes work for almost everything. Remember there ARE forward and reverse diodes. Louis  |  IP: Logged Michael Schaffer "Where is the Boardwalk Hotel?" Posts: 4143 From: Boston, MA Registered: Apr 2002 posted 03-30-2006 05:07 PM                        Another thing I have quite often seen in the field and that needs to be gotten rid of is when you find diodes where somebody has put a piece of loose hose or tubing around the leads to insulate them. That is not a good idea since it creates a pocket of air which can be heated up and contribute to the early failure of the diode. If you add insulation, it should be heatshrink. I have also found a few which weren't simpled open, but physically broken with the tail loose. In those cases, I think people may have held on to the tail of the diode while tightening them down against the heatsink. That is another bad idea because it can put mechanical stress on the diode and contribute to its early demise. As Mark pointed out, the CFS PSs are actually fairly well designed units but the console design puts them into a tiny space with not much air circulation. Yes, they have a big fan in the compartment door but I found that improving the circulation adds to their reliability.  |  IP: Logged Dustin Mitchell Phenomenal Film Handler Posts: 1865 From: Mondovi, WI, USA Registered: Mar 2000 posted 03-30-2006 07:02 PM                     To speed up the process of emergency diode repair we keep a spare diode bridge on hand. That way if a diode fails during a show we only need to swap out the bridge and can worry about testing/finding the bad diode and changing it later. Of course we've only had one diode go bad in our 6 SLC lamphouses in the past 9 years. I believe its been mentioned on this site before but excessive diode failures can be a seen of inconsistant electricity in your building-phases out of balance, etc. Its something you might want to have an electrician check out.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 03-30-2006 08:56 PM                     quote: Louis Bornwasser Remember there ARE forward and reverse diodes. The standard DO-5 Semikron come in both forword and reverse. The leaded type come all set to just pop right into your favorite Irem. I think cost was about 8.00 each in 100 quantities. quote: Dustin Mitchell I believe its been mentioned on this site before but excessive diode failures can be a seen of inconsistant electricity in your building-phases out of balance, etc. Its something you might want to have an electrician check out. Surge protectors ono the booth panels today are an absolute must. Probaby why we rarely see Strong Switcher failures, or many other electronic failures. Sqaure-D makes some very good ones. Mark  |  IP: Logged Paul Konen Jedi Master Film Handler Posts: 981 From: Frisco, TX. (North of Dallas) Registered: Jun 99 posted 03-31-2006 09:16 AM                     At first, it was just change out the bad one. Sure enough, a week or so later, the sister diode would go out too. So the procedure became what Randy said. Do the bad one now, change out the sister diode at the next break. This was mainly on the SLC-30 consoles. Been in the process of changing out those smaller diodes with "beefier" ones that Christie now puts in newer consoles.  |  IP: Logged

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