Lincoln Electric RED-D-ARC DX450 Service Manual page 49

F-5
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
No welding output in any mode.
The auxiliary output is normal.
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 AND REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
Place the Welding Terminals switch
in the "WELD TERMINALS ON" If
the problem is solved and there is a
control cable, wire feeder, amptrol,
or arc start switch connected, the
fault may lie in the above attached
accessories.
If the correct OCV is present at the
weld output terminals, check the
welding cables, connectors, work
clamp, electrode holder, etc. for
loose or faulty connections.
CAUTION
Check for damaged conductors or
faulty connections on the heavy
current carrying leads that connect
the output studs to the Chopper
module and to the Output
Rectifier. Also check the shunt
and the choke assemblies for
damage and faulty connections.
See Wiring Diagram.
Check the Welding Terminals
Switch and the associated leads.
See Wiring Diagram.
Check gate leads #23 and #25
and Weld Control Board power
leads #13 and #14 for loose or
faulty connections. See Wiring
Diagram.
Perform the Chopper Module
Function Test.
Perform the Stator Voltage Test.
Perform the Output Rectifier
Test.
The WELD CONTROL board may
be faulty.
DX450
RECOMMENDED
COURSE OF ACTION
F-5