Matco Tools MM200 LCD Operator's Manual page 22

No striking arc and no
5
output voltage
Welding stops, and alarm
6
light is on
Welding current is run
7 away and can be not
controlled
The crater current can be
8
not adjusted
9 No post-gas
MAINTENANCE AND TROUBLESHOOTING
Wire feed pipe is jammed
Tip is jammed because of
splash
Output cable is connected
mistakenly, or loosen
Control circuit damaged
Machine has
protection
The potentiometer
damaged
The control
damaged
The PCB damaged
The PCB damaged
- Ⅳ -
Repair or change it
Repair or change it
Screw it down or change it
Check the circuit
Check over-voltage,
self-
over-temperature, lower-voltage and
over-temperature, and solve it
Check or change it
circuit
Check the circuit
Check it
Check it
over-current,