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TROUBLESHOOTING & REPAIR
F-7 F-7
POWER MIG 350MP
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely,
contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
1-888-935-3877.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
FUNCTION PROBLEMS
No control of arc voltage. Wire
feeding is normal.
1. The arc voltage encoder may be
dirty. Rotate several times and
check if problem is resolved.
1. The arc voltage encoder may be
faulty. Perform Encoder Test.
2. Perform the Chopper Board
Test.
3. The Control board may be faulty.
Replace.
There is no voltage available at the
115VAC receptacle.
1. Check the 15 Amp circuit break-
er. Reset if necessary.
1. Check the 15 Amp circuit break-
er.
2. Check for loose or faulty connec-
tion. See wiring diagram.
3. Perform the Main Transformer
Test.
CAUTION
There is no gas flow when gun trig-
ger is pulled. Wire feeds and weld
voltage is present.
1. Check gas source and hoses for
leaks or kinks.
2. Check regulator on the tank for
the pressure being set to high.
1. Check for 6.5 VDC when trigger
is pulled at feedhead Board,
Plug J83-3 lead 833 and J83-4
lead 834. See Wiring Diagram.
If you read 12 VDC solenoid may
be open or a bad connection.
Check wiring.
Check the gas solenoid by discon-
necting it from the Feeder Board
(Plug J83-3 & 4) and applying a 12
VDC external supply to the gas
solenoid. If the solenoid does NOT
activate then it may be faulty.
Replace.
2. If 6.5VDc is not present the
Feeder broad may be faulty.
Replace.