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TROUBLESHOOTING & REPAIR
F-20 F-20
POWER WAVE 450
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.
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 1-
800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
WELDING PROBLEMS
For no apparent reason the weld
characteristics have changed.
1. Check for proper wire feed
speed setting. In the
MIG/MAG and FCAW Modes,
check for proper voltage set-
tings. In the MIG/MAG Pulse
Modes, check the arc length
trim setting. These controls
are on the wire feeder. In the
Stick Mode, check for proper
preset current setting.
2. Check for proper shielding gas
and gas flow.
3. Check for loose or faulty weld-
ing cables.
1. If zero arc voltage is displayed
while welding, the voltage
sense leads may be broken.
Check the following molex
plugs and associated wiring for
loose or faulty connections:
J60, J62 on the snubber board
J20 on the control board
2. Perform the Welding
Feedback Test.
3. The control board may be
faulty. Replace and perform
voltage calibration and current
calibration.
The arc is “too hot,” and cannot
be adjusted.
1. Perform the full voltage cali-
bration.
1. Check plugs J60, J62 and J20
for loose or faulty connections.
See Wiring Diagram.
2. The snubber board may be
faulty. Replace and perform
full voltage calibration.
3. The control board may be
faulty. Replace and perform
voltage calibration and current
calibration.