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TROUBLESHOOTING & REPAIR
F-7 F-7
POWER MIG 300
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
1-800-833-9353.
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. Codes 10562 have both
Encoders on one board. Codes
above 10562 have single
Encoders.
2. If machine has code 10562 or
lower change Encoder Board. If
machine has Code above 10562
Perform Encoder Test.
3. Perform the Chopper Board
Test.
4. The Control board may be faulty.
Replace.
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.