I got my pro90 working!!!!!!!

[exminiman]

I got my pro90 working......if you have a 6 pin pcb, bridge ja and jb together. J1 .........MAXMIN J2..... 1/2 J3.... LIVE J4..... NEUTRAL.
You have two black wires coming from the multiplug. One goes to the wire feed motor, the other goes under some sheathing connected to the trannsformer.....Give it a little tug(POWER OFF!!). Mine came away in my hand. Cut off sheathing, solder back onto "hard wire" and weld away!!!!!!!
Before you buy a pcb you could even try giving the black wire a tug (WITH THE POWER OFF!!!!! ) just to make sure........

 

[Robotstar5]

RESULT!!

 

[exminiman]

I certainly like to think so! Just to make myself feel better, I put the old pcb in after resoldering the resistor and cleaning the relay conatcts(wiring it up the "old" way,) and it never worked.....proving I DID need the pcb...yee and indeed har!