IMA 578BLA Maxmig 210 Page 13
Possible Cause
Defective wire feed motor or wire drive
control PC board.
Defective wire drive control PC board.
Control cable not connected.*
Overtemperature protection circuit actuated
due to overload or short. Overtemperature
light should be illuminated.
Faulty gun trigger switch or damaged control
cable connected to gun trigger.
Defective control PC board.
Defective contactor
Improper settings for wire feed speed and
volts.
Faulty rotary switch either coarse control
(on/off) or fine control.
Faulty pilot transformer.
Faulty main transformer.
Faulty rectifier.
Faulty choke.
What To Do
Measure the voltage between Red motor
lead (54) and the Green motor lead (53)
when the wire inch push button is
depressed. If this voltage is over 10V DC,
replace the wire feed motor. If no voltage is
registered, replace the wire drive PCB.
(Refer PCB replacement procedure at end of
Troubleshooting Guide).
Replace PCB. (Refer PCB replacement
procedure at end of Troubleshooting Guide).
Connect cable to welding power source.
Allow machine to cool down and reduce on
time and/or wire feed speed.
Repair.
Refer Procedure for Replacing PC Boards at
end of Trouble Shooting Guide, if no fault is
detected in trigger-thermostat circuit.
Replace defective contactor
Set controls correctly.
Replace rotary switch.
Replace.
Replace.
Replace
Replace.
Problem
No wire feed, although arc
voltage is present.
No control of wire feed.
No wire feed and no arc voltage.
Pilot light indicates input power
to machine.
Poor welding characteristics
and/or cannot obtain full rated
output as per nameplate.
* For Remote M/Cs only.
TROUBLESHOOTING
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