Lincoln Electric VANTAGE 400 Service Manual page 57

F-9
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The machine welds but it will not
maintain a steady output.
(continued)
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely,
contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed.
Call 1-888-935-3877.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
ENGINE PROBLEMS
CAUTION
VANTAGE® 400
RECOMMENDED
COURSE OF ACTION
There may be poor connections in
the control wiring at the weld con-
trol P.C. Board, or the chopper
board. Pull each plug from the
weld P.C. board and thoroughly
inspect the terminals in both the
plugs and the P.C. Board recepta-
cles. Make sure the connections
are clean and the pins are proper-
ly seated in the plastic plug hous-
ing. Check for loose or damaged
pins and faulty crimps.
Check for damaged wiring and
poor connections in the 13, 14,
and the 23, and 25 leads, between
the chopper module and weld con-
trol P.C. Board.
The output control or the arc con-
trol potentiometer may be defec-
tive or grounded. The mode
switch may also be faulty. Perform
the POTENTIOMETER AND
MODE SWITCH RESISTANCE
TEST.
The Amphenol receptacles may be
contaminated or defective.
Perform the REMOTE RECEPTA-
CLE RESISTANCE TEST.
Replace the weld control P.C.
Board.
F-9