[knbasel1270]

Have older dx 300 when you first start welding on alum the HF workes fine after about 20 minutes the HF wont start if I turn off the machine for 10-15 minutes I can get one weld and then the HF wont restart I can do this 3 or 4 times before it starts to sputter at the end of the weld cycle
has the old points have set correct gap machine is clean and never been used hard only aluminum any idea we’re to look or how to fix

 

[knbasel1270]

I was able to find the right manual and wiring diagram but can’t figure out how to post it here the sn is LB129346
DYNASTY 300 DX
need help with how to test I can check the connections and see if any thing is loose or looks bad but as far as testing boards I done have a clue but I’m a fast learn
also do I need to dump the capacitors before I start working inside
‘and they just get shorted across to dump the stored energy correct