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TROUBLESHOOTING & REPAIR
F-38 F-38
POWER MIG 350MP
This is a typical DC output voltage waveform generated from a properly operating machine. Note that
each vertical division represents 20 volts and that each horizontal division represents 2.00 milliseconds in
time.
NOTE: Scope probes connected at the machine output terminals: (+) probe to electrode, (-) probe to work.
SCOPE SETTINGS
Volts/Div.....................20V/Div.
Horizontal Sweep..2.0 ms/Div.
Coupling.............................DC
Trigger.........................Internal
OSCILLOSCOPE WAVEFORMS MUST BE TAKEN IN MODE 201
NORMAL OPEN CIRCUIT VOLTAGE WAVEFORM
20.0 V
2.0 MS/DIV
TEST SET-UP
Power MIG 350MP in mode 201. Mode 201 is a constant current test mode.
1. Toggle and hold the Mode Select switch in the up position.
2. Turn on the Power MIG 350MP.
3. Once the display reads “Pres Spin” release the mode select switch. Rotate the output knob until
the display reads “ALL nodE”.
4. Toggle the Mode Select switch once and wait for the machine to reset, then toggle the MODE
SET switch until the MSPlll panel reads 201. Disengage the idler arm on the wire drive so no
wire will feed.