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F-25 F-25
ACTIVE SCR TEST
TROUBLESHOOTING & REPAIR
MULTI-SOURCE
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WARNING
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 troubleshooting
assistance before you proceed. Call (800) 833-9353 (WELD).
TEST DESCRIPTION
The active SCR Test will determine if the device is able to be gated “ON” and conduct current from
anode to cathode.
MATERIALS NEEDED
An SCR Tester (as outlined in this procedure)
Analog Volt/Ohm Meter (Multimeter)
MULTI-SOURCE wiring diagrams (See Electrical Diagram Section of Manual).
3/8” Nut Driver
9/16” Wrench
This procedure takes approximately 45 minutes to perform.