Hello everyone..
I’ve just bought a lemon (from a dodgy seller). I OC voltage tested and got ~60v across the terminals, so bought it home.
now I know I have a lemon (and surprise.. the buyer refuses to take it back )
I cannot find a schematic for it.. it appears clean and no obvious damage/burning (apart from 2 suspicious electrolytica i replaced with no symptom change.
I’m not the first to be in here (the gas solenoid had been replaced at some stage).
the symptoms:
1. The display shows “609” when (it does seem to pulse when in pulsed mode between 609 and 614 - video)
2. None of the potentiometers appear to do anything much (the pulse width does appear to influence a change to the pulse changes)
3. MMA or Tig setting.. electrode causes a MASSIVE arc (regardless if the button is pressed) then the unit goes into overtemp LED on.. and shuts down.
4. Regardless of the TiG button, the solinoid stays energised and no influence of the post/pre gas potentiometer makes a change.
5. On the board is a spark gap that when I press the tig button I see sparking...
I cannot arc or TiG with this unit.
I’ve seen a number of people post “common problem related to HF” but I can find nothing that matches this unit and without a schematic it’s difficult to know where to even start.
not a lot of money invested in this so far - but I bought it to allow me learn to DC TiG Aluminium... hoping I can get some guidances from you all.
Is there a schematic for it? Anyone any experiance in this problem?
before I start cracking our the scope and blowing it up (I gave enough board-level experiance and tools do get myself into trouble - and sometimes out of it
Any guidance would be appreciative.
Mike
I’ll try and find a way to post up photos/video...
I’ve just bought a lemon (from a dodgy seller). I OC voltage tested and got ~60v across the terminals, so bought it home.
now I know I have a lemon (and surprise.. the buyer refuses to take it back )
I cannot find a schematic for it.. it appears clean and no obvious damage/burning (apart from 2 suspicious electrolytica i replaced with no symptom change.
I’m not the first to be in here (the gas solenoid had been replaced at some stage).
the symptoms:
1. The display shows “609” when (it does seem to pulse when in pulsed mode between 609 and 614 - video)
2. None of the potentiometers appear to do anything much (the pulse width does appear to influence a change to the pulse changes)
3. MMA or Tig setting.. electrode causes a MASSIVE arc (regardless if the button is pressed) then the unit goes into overtemp LED on.. and shuts down.
4. Regardless of the TiG button, the solinoid stays energised and no influence of the post/pre gas potentiometer makes a change.
5. On the board is a spark gap that when I press the tig button I see sparking...
I cannot arc or TiG with this unit.
I’ve seen a number of people post “common problem related to HF” but I can find nothing that matches this unit and without a schematic it’s difficult to know where to even start.
not a lot of money invested in this so far - but I bought it to allow me learn to DC TiG Aluminium... hoping I can get some guidances from you all.
Is there a schematic for it? Anyone any experiance in this problem?
before I start cracking our the scope and blowing it up (I gave enough board-level experiance and tools do get myself into trouble - and sometimes out of it
Any guidance would be appreciative.
Mike
I’ll try and find a way to post up photos/video...