Memmeddu
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Now the input control theory makes more senseYes, bog-standard bridge rectifier with multiple ceramic-sealed pressfit diodes in parallel on each plate.
Now the input control theory makes more senseYes, bog-standard bridge rectifier with multiple ceramic-sealed pressfit diodes in parallel on each plate.
Could well be, certainly does look kind of like that now you say it.The yellow thing seems to be a power supply transformer
Not been at the workshop yet, will be heading there soon but I have a load of machining to do so not sure if I will get a chance to look at the plasma.Anyway we are saying for sure that the problem is the control circuit but
Did you check the diodes as we said yesterday?
I would imagine TecArc could repair it, after all they built it.Can the dealer repair it for you ?(cost effectively I mean)
not sure what the component arrowed in yellow is.
Sadly the whole thing is covered in black conformal coating so the picture is not very clear.
That is the ugliest PCB I have ever seen !
Never seen black conformal coating before. Maybe the part numbers are secret ?
https://www.intertronics.co.uk/2016/09/black-conformal-coating-enhances-pcb-security/
The yellow component could be an encapsulated PCB-mount transformer, with the nearby blue leads being the AC primary input.
Or it could be a relay, with the blue leads feeding a Contactor coil.
I still can't understand how this thing works
Because seems that input side and output side are not controlled by electronic
Which seems to control , overheating protections , pilot arc ignition, power contactor and air solenoid valve .
No input or output power seems to go through the PCB
So I might say that the IGBTs or SCR are installed into the transformer , packed under the windings
If you cannot findI have the answer for you
Hidden below the big capacitor is this.
View attachment 216830
Datasheet here
http://www.mitsubishielectric.com/s.../powermodule/igbt/s_series/cm150exs-24s_e.pdf
It surely canPot is ok, not sure how to check the rectifier as I am thinking it will need separated for testing and I don't have time for that at the moment.
Would that really cause a problem such as low current output anyway?