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Author Topic: CP55 power supply blowing fuses Jon Bartow Master Film Handler Posts: 287 From: Massachusetts Registered: Nov 1999 posted 12-09-2002 08:34 AM                     At one of my theaters they have one CP55 that has twice in the last 18 months blown fuses. Symptoms are as follows: On power-up at the beginning of the day (via circuit breakers) the main fuse blows and the systems stays in Bypass. System is turned off and main fuse is replaced. Back on only to blow the fuse again. I removed the power supply and voltage regulator to look for anything obvious (you know, fried components). Nothing. After putting the power supply and voltage regulator card back in, replaced the fuses and it's ok. Then I removed the power supply and voltage card again and cleaned the contacts and reinstalled. This happened 18 months ago and a month ago in the same house. Any ideas? The CP55 has been converted to split surrounds (i.e. backplane mods and cat 441 card) Other than the fuse issue there have been no other problems with this processor. Also, there are no surge suppressors on any of the booth equip at this theater, but it is a large multiplex and none of the other processors have blown fuses (CP500's, 65's and 55's). And I did use 600mA fuses not 1/5A fuses as some are prone to doing. Jonathan  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 12-09-2002 08:47 AM                     If you have another CP55 in the same location I'd start by swapping the power supply and regulator card to another unit. See if this problem follows those two items. Then you know where the problem is. If the problem persists in the original unit with another power supply and regulator card then you have a component failing on another card and you'll have to do the same swap out thing to determine which card is at fault. Obviously this could take a long time but as this is an intermittent problem but it is about the only way. The 55 is a great unit and worth repairing...better sounding than anything new on the market except the Panastereo. Mark @ CLACO  |  IP: Logged Jon Bartow Master Film Handler Posts: 287 From: Massachusetts Registered: Nov 1999 posted 12-09-2002 02:23 PM                     I already switched the two cards with another unit (after this second time) Sorry, I should have mentioned that in the original post Jonathan  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 12-09-2002 02:45 PM                     I guess the question is did it stay with the cards or with the processor  |  IP: Logged Daryl C. W. O'Shea Film God Posts: 3977 From: Midland Ontario Canada (where Panavision & IMAX lenses come from) Registered: Jun 2002 posted 12-09-2002 02:53 PM                        quote: switched the two cards with another unit (after this second time) Doesn't sound like it has failed yet, after switching the cards.  |  IP: Logged Jon Bartow Master Film Handler Posts: 287 From: Massachusetts Registered: Nov 1999 posted 12-09-2002 10:04 PM                     No, it hasn't failed since switching the cards. And if history repeats itself it could take a year or more to happen again. And when it does, then I'll be able to take the next step, whether replacing or repairing faulty cards or switching more cards around. I'm just checking to see if anyone else has experencied a problem like this so I could get another idea to check out. Jonathan  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 12-12-2002 08:35 AM                     If you still have the original regulator boards in your CP-55 (Cat. 249), I'd replace it to the Cat. 249A...The Cat 249s were MUCH more prone to failure and I haven't met one that hadn't started to blacken the underside of the board. The Cat. 249A has better filtration and is easily distinquished by the large capacitors sticking through the metal casing. Steve  |  IP: Logged

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