faulty HF

weldking · Dec 18, 2007

For some reason the high frequency stopped working on my synchrowave 250. I cannot figure out why it won't work anymore. I cleaned the contacts, gapped them, overagain, whatever! I may have to take it to a repair shop if I can't fix it myself. Any advice?

macona · Dec 18, 2007

No buzzing at all? Bad hf capacitor. Shorted out. Depending on the revision of the 250 the cap could be a black block with two screw terminals on it or a yellow epoxy dipped cap with leads coming out. The yellow one was crap and they went back to the black one. When you order a new one for that machine it will come as a kit. It is a total pain in the arse to get the old one out as it is riveted to the panel so I just cut the leads and mount the new one somewhere else with either zip ties or double sided foam tape.

Kit is a but over $100

Gimme a serial and I can get you a P/N.

-Macona
Repair God for Hire

weldking · Dec 19, 2007

Thanks Macona, thats good news for me. I will have to dig up the number. I am working out of town for a while, but hopefully I can make it out to the machine this weekend. Thanks for your help.

weldking · Dec 21, 2007

the serial # is KF 941777

macona · Dec 22, 2007

That should be the normal black cap. Take the two wires off the cap and try the hi-freq without the cap installed. You should have a spark through the gaps now. If not it may be a bad transformer or a bad relay that controls it. Use a meter and check for 120v going into the transformer. Also make sure there is 120v at the receptacle on the front panel.

The cap is miller PN 096761

weldking · Dec 23, 2007

Thanks, Macona I will try these things and let you know what happens.

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