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TROUBLESHOOTING & REPAIR
F-17 F-17
IDEALARC DC-655
FIRING BOARD TEST
WARNING
Service and repair should be performed by only Lincoln Electric factory trained person-
nel. Unauthorized repairs performed on this equipment may result in danger to the tech-
nician or machine operator and will invalidate your factory warranty. For your safety and
to avoid electrical shock, please observe all safety notes and precautions detailed
throughout this manual.
If for any reason you do not understand the test procedures or are unable to perform the
test/repairs safely, contact the Lincoln Electric Service Department for electrical trou-
bleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353
(WELD).
TEST DESCRIPTION
This test will help determine whether or not the firing board is receiving the correct volt-
ages and signals. The LEDs (Light Emitting Diodes) will help determine if the firing board
is generating gate signals for the main SCRs.
MATERIALS NEEDED
Volt/ohmmeter (Multimeter)
DC-655 wiring diagram and firing board schematic drawing