Lincoln Electric VANTAGE 400 Service Manual page 59

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Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The machine seems to be locked
into the "CC-stick" mode of opera-
tion.
The arc quality is poor with exces-
sive spatter. The arc heat can be
controlled and maintained normal-
ly, the auxiliary output is normal
and the engine operates normally.
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
Check the position of the WELD
MODE selector switch. The switch
should positively snap into each
mode position and should not feel
gritty or get stuck between posi-
tions.
The ARC CONTROL may be set
too high.
The output control may be set too
high for the electrode being used.
Check that the electrode is of
good quality, dry and free from
contamination. Try using some
Lincoln Electrode, and setting the
machine per Lincoln's recommen-
dation.
If shielding gas is used, check that
the gas and gas flow are correct.
Check for damaged, pinched, or
leaking gas lines.
Check for proper work, and elec-
trode leads and connections (size,
length, coils, or bad connections).
CAUTION
VANTAGE® 400
RECOMMENDED
COURSE OF ACTION
Check that plug P-7 is fully seated
into the weld control P.C. board
socket. See Control Inner-
Connection diagram.
Check for corroded, dirty, or dam-
aged Molex terminals in plug P-7,
also check for similar problems in
socket J-7 on the weld control P.C.
board.
Check the wiring between the con-
trol P.C. Board and the mode
switch. Look for poor crimp and
solder connections as well as
damaged wiring or insulation. See
wiring diagram.
Perform the CONTROL POTEN-
TIOMETER AND MODE SWITCH
RESISTANCE TEST.
The Weld control P.C. Board may
be faulty.
Check that the weld circuit isn't
grounded. With the engine off,
check the resistance between
chassis ground and the weld out-
put terminals. The resistance
should be very high, a minimum of
500,000 (500k) Ohms.
The weld control system may be
grounded or malfunctioning.
Perform the CONTROL POTEN-
TIOMETER and MODE SWITCH
TEST, and the REMOTE RECEP-
TACLE RESISTANCE TEST.
The Chopper module may be
defective. Perform the CHOPPER
MODULE RESISTANCE TEST.
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