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Clarke 100EN - PCB
- Thread starter Ianh99
- Start date
I am not aware of a full circuit diagram for the E1289 PCB, only functional-level diagrams with the whole welder.
E.G. Page 27 here:
There is an annotated picture of that board from mike 109444 in this thread:
The 30v AC output of the small transformer on the board is half-wave-rectified by a diode and fed to the operating coil of the relay when the torch switch is closed at Pins 1 and 5. You could jumper across those pins to test, and trace the tracks from the transformer secondary to find the diode.
On the "EN" models the torch has two thin wires connected to the switch. [ Gas-only models have only one, and "borrow" the main DC power cable in the torch sleeve as the second switch conductor.]
The power transistor and the rest of the speed control circuit for the wirefeed motor is separate to the relay power-up circuit.
E.G. Page 27 here:
There is an annotated picture of that board from mike 109444 in this thread:
Afternoon all, I've been reading this forum for some time now picking up tips so firstly many thanks to all those that have heed without realisation over the years.
I've however got to the point that where I can't find the answer and need to ask the question.
My 135 was working fine until it stopped feeding, initially I thought it was the gun. Stripped and cleaned contact spring and block seemed to resolve. On the next welding run it died again, initially I thought it might have been duty cycle but after leaving there was still no joy.
Cover off and PCB inspection, all tracks look...
I've however got to the point that where I can't find the answer and need to ask the question.
My 135 was working fine until it stopped feeding, initially I thought it was the gun. Stripped and cleaned contact spring and block seemed to resolve. On the next welding run it died again, initially I thought it might have been duty cycle but after leaving there was still no joy.
Cover off and PCB inspection, all tracks look...
The 30v AC output of the small transformer on the board is half-wave-rectified by a diode and fed to the operating coil of the relay when the torch switch is closed at Pins 1 and 5. You could jumper across those pins to test, and trace the tracks from the transformer secondary to find the diode.
On the "EN" models the torch has two thin wires connected to the switch. [ Gas-only models have only one, and "borrow" the main DC power cable in the torch sleeve as the second switch conductor.]
The power transistor and the rest of the speed control circuit for the wirefeed motor is separate to the relay power-up circuit.
