Troubleshooting - Ryobi MMA-140 Owner's Operating Manual

DANGER!
connect power supply before service.
Problem
The welding arc cannot
be established.
Maximum output
welding current cannot
be achieved with
nominal mains supply
voltage.
Welding current
reduces when welding.
Welder will not start.
No weld output with
ready light on.
No weld output; high
temperature light on.
Fan not operating.

TROUBLESHOOTING

Follow all safety precautions whenever diagnosing or servicing the tool. Dis
Possible Cause
The primary supply voltage has not
been switched ON.
The welding power source
switch is switched OFF.
Loose connections internally.
Defective control circuit.
Bad work clamp to workpiece
connection.
No power at outlet.
Cord not connected.
Line voltage incorrect.
Weld cable loose.
Bad work clamp to workpiece con-
nection.
Welder overheated.
Duty cycle or amps too high.
Airflow is blocked.
Fan blocked/dirty.
Fan broken.
Remedy
Switch ON the primary supply voltage.
Switch ON the welding power source.
Have an qualified service technician
repair the connection.
Have an qualified service technician in-
spect then repair the welder.
Ensure that the work lead has a
positive electrical connection to the
work piece.
Check power at outlet.
Check that cord is plugged in.
Make sure the welder is plugged into a
230V electrical outlet.
Tighten weld cable connection at
welder.
Make sure the area where the clamp is
attached is clean, exposed metal; free
of dirt, paint and oil.
Allow unit to cool with the fan on.
Reduce duty cycle or amps.
Clean vents and fan out with
compressed air.
Remove obstruction and clean with
compressed air.
Have the fan replaced by a qualified
service technician.
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