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TROUBLESHOOTING & REPAIR
F-11 F-11
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
OUTPUT PROBLEMS
Machine regularly overheats-yel-
low light (LED) on the front panel
glows, indicating a thermal over-
load. The display is on.
1. Welding application may
exceed recommended duty
cycle.
2. Dirt and dust may have
clogged the cooling channels
inside the machine. Refer to
the Maintenance Section of
this manual.
3. Air intake and exhaust louvers
may be blocked due to inade-
quate clearance around
machine.
4. Make sure both fans are func-
tioning correctly.
1. One of the thermostats located
on the output rectifier or FET
heat sink may be faulty. Test
or replace.
Machine does not appear to over-
heat, but yellow light turns on and
off intermittently. Output is dis-
abled whenever yellow light is on.
NONE 1. Check thermostats on output
rectifier and switch board #1.
These thermostats are normal-
ly closed.
2. Check leads from thermal
switches to molex plug J23 on
the control board for loose or
faulty connections.
3. The control board may be
faulty. Replace, and perform
voltage calibration and current
calibration procedures.
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