help with old welder

[bd354]

Hi everyone, i aquired an old Linde ucc-305 machine and i can't get it to weld. it will arc and spark a little but not enough to burn a rod. same thing on ac,dc+,dc-,hi,med,or low. tried all positions on all switches and dials. does the same thing. i did notice a small difference in the hi,med,lo setting. i'm only planning to use this for stick. a friend found a blown capaticitor on a circuit board in the SCR control panel assembly. the book calls the cb a printed trigger circuit board 673673. does this control welding current? where could i find a replacement board or cap? any help/advice appreciated. george

[snoeproe]

What are you trying to weld? what rods r u using?

[MAC702]

Did you acquire it in this condition knowingly? Is there any way to first ask the previous user who had it working properly what might be different?

Please put the actual machine in the subject line. You'll more easily attract the people who can help you.

[bd354]

the machine was one of six bought at auction by a friend of mine. i bought it from him with a money back if it doesn't work deal. it came from a power plant in south fl. the previous five welders worked fine and i have the last one-of course the only one that won't work right out of the gate. the machine was used for tig but i plan to weld stick only. it's just the power supply, no tig setup came with it. i tried 1/8 6011 and 1/8 7018 on all the various power settings and only got alittle sparking. any advice/ suggestions appreciated.

[old fart]

It sounds like the scr control board is fried. Contact ESAB 800-372-2123 they may have some still available or if not Innovat at 800-626-1887 have some sucess at repairing boards. Good luck
O.F.

[arcackle]

I know this may seem a little obvious, but have you check all the connections to the cables?

Look for anything loose or rusty.

[bd354]

thanks guys,george

[bd354]

sorry arcackle, didn't see your post, supply wiring,welding leads, and welding rods are all new.checked for correct voltage at input terminals, everything checks out so far. will start cleaning all connections i can get to tomorrow. been a son of a gun of a week. thanks for the suggestions. george

[bd354]

Well I finally gave up on the old Linde and returned it for a refund. Ordered a Hobart Stickmate AC DC and got it yesterday. welds better than anything i've used in a long time. think i'm gonna like this.