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F-20
TROUBLESHOOTING & REPAIR
F-20
FIRING BOARD TEST
IDEALARC DC-1000
Service and repair should be performed only by Lincoln Electric factory trained personnel.
Unauthorized repairs performed on this equipment could result in danger to the technician or
the 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
tests/repairs safely, contact the Lincoln Electric Service Department for technical trou-
bleshooting assistance before you proceed.
Call (216) 383-2531 or (800) 833-9353 (WELD).
_____________________________________________________________
TEST DESCRIPTION
This test determines whether or not the Firing Board is receiving the correct voltages and
gate signals. The LED’s (Light Emitting Diodes) will help you determine if the Firing Board is
generating gate signals to the main SCR’s.
MATERIALS NEEDED
Volt/Ohm Meter (Multimeter)
IDEALARC DC-1000 Wiring Diagram and Firing Board Schematic Diagram (See Electrical
Diagram Section of Manual).
WARNING