Thanks for the offer This board does look very similar except for the position of the relay etc
The two TO-220 transistors on the heat sink are the same
I have checked these and also replaced them and checked all components and external pots etc
By accident whilst working on it I noticed that...
I think hens teeth are just a little more common
I will probably spend some time drawing out the circuits if I cannot get a drawing
If so I will post it
JR
Thanks have already found the welder diagrams but cannot see anything for the PCB
If I cannot get diagram for PCB will have to rig up test circuit on my bench and then spend some time with meter and scope
Hope to save a lot of time with a diagram
JR
Have checked ALL components and tracks on the PCB All OK If I can get a circuit diagram I am sure I can make it work
Have tried Murex they do not seem interested
Found a cschematic for the welder but cannot find anything for the PCB
Thanks for taking the time to reply JR
Have retired and want to do a bit of welding Got given a Murex Tradesmig 251 but it has a problem with the wire feed Have a bit of experience with electronics and have traced the fault to the PCB
All pots and switches are OK and I have power to the PCB Contactor clicks but no feed Motor is OK...