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TROUBLESHOOTING & REPAIR
F-21 F-21
LN-9 GMA Wire Feeder
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TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
STARTING PROBLEMS
The output voltage is too low to
start the weld.
1. Check the welding cables for
loose or faulty connections.
2. Put the Lincoln power source in
the "Machine Control" mode.
Jumper the "BYPASS" pins on
the LN-9 GMA voltage PC
board. Adjust the weld voltage
from the power source for the
process being used. If the cor-
rect voltage cannot be set, the
power source may be faulty.
3.
Check for correct control cable
connections to the power supply.
4. The control cable may be faulty.
Check or replace.
1. Check the voltage control
potentiometer (R3) and the
associated leads. See the
Wiring Diagram.
2. The voltage PC board may be
faulty. Replace.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
216-383-2531 or 1-800-833-9353.