Protection/Snubber Board Continuity Test - Lincoln Electric SQUARE WAVE TIG 255 SVM100-A Service Manual

TROUBLESHOOTING & REPAIR

PROTECTION/SNUBBER BOARD CONTINUITY TEST

Service and repair should only be performed by Lincoln Electric factory trained person-
nel. Unauthorized repairs performed on this equipment may result in danger to the
technician or machine operator and will invalidate your factory warranty. For your safe-
ty 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 216-383-2531 or 1-800-833-9353
(WELD).
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If machine case sides and top are removed the case back and front must be support-
ed. Failure to do this could result in mechanical or electrical damage to the TIG 255.
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TEST DESCRIPTION
Many circuits pass through the protection/snubber board. The purpose of this test is to
determine if the board's circuitry and components are intact and capable of passing
signal currents.
MATERIALS NEEDED
Ohmmeter (Multimeter)
TIG 255 Wiring Diagrams (see Electrical Diagram section of manual)
Protection/snubber board Continuity Table, Figure F.6.
WARNING
CAUTION
F-20
SQUARE WAVE TIG 255