idealarc 250 mig blowing capacitors

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I have a 22 year old Idealarc 250, that blew out 2 of the capacitors. I replaced them and after welding for about 15 min the same 2 capacitors blew . What can I look at for other causes?
Reply:What is your code number?More welders than you can imagine! Arc-Heat Welder Repair and Sales4360 Commerce Circle Unit EAtlanta GA 30336Phone# 404-736-6494
Reply:what code? , The serial number or model ??
Reply:When the diodes go bad, AC goes to the capacitors and they can't handle it. With no other information to go on, I would be checking for bad diodes.CharleyMiller MM252Miller Bobcat 225NTMiller DialArc HF / DIY Cooler2 Victor O/A TorchsetsMilwaukee 8" Metal SawMilwaukee Dry Cut "Chop" Saw 5 Ton Wallace Gantry Various Grinders, Benders, etc.
Reply:Originally Posted by CharleyLWhen the diodes go bad, AC goes to the capacitors and they can't handle it. With no other information to go on, I would be checking for bad diodes.Charley
Reply:The welder is my dads, and he said he was welding and the it quit. My brother checked it over and found the 30000mf capacitors fried.  It is a lincoln SP250 Code 90402    S/N AC-801776.  I take it the diodes are on the main board??
Reply:An idealarc 250 is a stick welder. an idealarc SP 250 is a mig welder. which do you have.?If it is a SP250 and you only replaced part of the cap bank. not a good idea.Check the polarity you may have installed one or more wrong.Please post the code number so I know which welder you have and which version of it.The first 6 digits of the serial number will tell me how old it is.If you have a code 9402 sp 250 with round head screws holding the caps to the buss bars. Get your welder to a Lincoln service center for a free cap bank. If your cap bank has hex bolts it has already been replaced. If you have push on jumpers its the stick welder.PS put the original caps back in the welder before you take it in. because they have to be sent back to lincoln.Last edited by ccawgc; 08-26-2011 at 11:16 PM.
Reply:It is an SP-250 mig/ code 9402, I will take it to the service center, we have one in town. I will also bring the caps in with me, I wll also have them check out the diodes.THANKS FOR ALL THE HELP GUYS,  MY DAD SAID TO THANKS ALSOLocal Lincoln dealer wanted $490.00 for the cap bank, I got replacements from digi-key for $165.00 for all four.Will let you know what they findUPRED