Matco Tools MM200 LCD - Page 22

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