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TROUBLESHOOTING & REPAIR
F-4 F-4
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
OUTPUT PROBLEMS
Major physical or electrical dam-
age is evident.
1. Contact the Lincoln Electric
Service Dept. 1-800-833-9353.
The machine is dead - the input
contactor does not operate. The
pilot light is not lit.
1. The power switch (S1) is in the
ON position.
2. Check for blown or missing
fuses in the input lines.
3. Check the three-phase input
line voltage at the machine.
The input voltage must match
the rating plate and reconnect
panel.
1. Check the power switch (S1)
and associated leads and con-
nections. See the Wiring
Diagram.
2. Perform the Control Trans-
former Test.
The input contactor operates, but
no welding output. The 115 VAC
auxiliary supply is present at the
receptacle.
1. Check the electrode and work
cables for loose or faulty con-
nections.
2. If the Thermal Protection Light
is ON, the machine is overheat-
ed. Wait for the machine to
cool and remedy the cause of
the overheating problem. See
the Fan/Snubber Board LED
Chart.
3. Make certain either the output
terminals switch is in the ON
position or the external gun
trigger circuit is functioning
properly.
1. Perform the Internal Trigger
Circuit Test.
2. Perform the Firing Board Test.
3. Perform the Main Transformer
Test.
4. Perform the SCR Output
Bridge Test.
5. The control board may be
faulty. See Control Board LED
Chart.