Airco Heliwelder High current problem and solution

[ceceljoeh]

no board schematic

I only had the welder schematic provided to me by burnt Hands. I had no schematic for the board and no huntron unit (I am not familiar with this terminology). The only way I could find the problem is to narrow the search (current control board and inductive reactor),...

[ceceljoeh]

Heliwelder IV High current problem and solution


Machine:
Heliwelder IV 1341-0176 code 665


Problem:
Weld current at range maximum regardless of range selection or weld current adjustment


Research:
I obtained a copy...

[ceceljoeh]

Heliwelder Mod photos on facebook

I just posted some high definition photos in photobucket of my Heliwelder modifications and linked it to my facebook page. See "Joe Higginbotham"

I linked photos of the front of the welder so you can see my ammeter mod as well...

[ceceljoeh]

control board



Cruizer

An update

I discovered the old school voltage regulator on the board (the MC7812) had failed and was putting almost +30 volts on the +12 volt dc buss on the board. This probably fried some other board components. I have purchased...

[ceceljoeh]

Does anyone have the control board schematic (the PC Board that drives the triac that saturates the control winding on the SX reactor).

[ceceljoeh]

Does anyone have a readable copy of the user manual for this unit (Airco Heliwelder IV 1341-0176 code 0665) that they could scan for me? I am new to this forum and have seen several threads related to this welder. Even just a Schematic would be most helpful. I am rebuilding one of these welders and...