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TROUBLESHOOTING & REPAIR
F-8 F-8
IDEALARC DC-655
Observe Safety Guidelines
TROUBLESHOOTING GUIDE
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
FUNCTION PROBLEMS
The output control potentiometer
does not function when the output
control switch (SW3) is in the
“Local” position. The DC-655
operates normally when controlled
remotely.
1. The output control switch (SW3)
may be defective.
1. The output control potentiome-
ter or associated wiring may be
faulty. See the Wiring Diagram.
The remote output control unit
does not function properly when
the output control switch (SW3) is
in the “Remote” position. The DC-
655 operates normally when con-
trolled locally from the machine’s
output control potentiometer.
1. The remote control unit or con-
necting cable may be defective.
Check or replace.
1. The output control switch (SW3)
may be defective. Check or
replace. See the Wiring
Diagram.
2. Check the remote control leads
#75, #76 and #77 at plug P15,
the terminal strip and the 14-pin
MS type connector. Check for
loose or faulty connections.
See the Wiring Diagram.