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TROUBLESHOOTING & REPAIR
F-6 F-6
IDEALARC DC-655
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
The machine has welding output
but no control.
1. Check the output control switch
(SW3) for proper setting.
2. If a remote control cable is
used, make certain the cable
and connections are good.
1. The output control potentiome-
ter, output control switch (SW3)
or associated wiring may be
defective. See the Wiring
Diagram.
2. Perform the Firing Board Test.
3. Perform the SCR Output
Bridge Test.
4. The control board may be
faulty. See the Control Board
LED Chart.
The machine does not have maxi-
mum output.
1. Check the three-phase input
lines at the DC-655. Make cer-
tain the input voltages match
the machine’s rating and recon-
nect panel configuration.
2. Put the output control switch
(SW3) in the “Local” control
position. If the problem is
resolved, the remote unit or
wire feeder may be defective.
1. The output control potentiome-
ter, output control switch (SW3)
or associated wiring may be
defective. See the Wiring
Diagram.
2. Perform the Main Transformer
Test.
3. Perform the Firing Board Test.
4. Perform the SCR Bridge Test.
5. The control board may be
faulty. See the Control Board
LED Chart.