Input Filter Capacitor Discharge Procedure - Lincoln Electric POWER WAVE 355/405 SVM159-A Service Manual

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INPUT FILTER CAPACITOR DISCHARGE PROCEDURE

Service and repair should be performed by only Lincoln Electric factory trained
personnel. Unauthorized repairs performed on this equipment may result in danger to
the technician 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
troubleshooting assistance before you proceed. Call 1-800-833-9353 (WELD).
DESCRIPTION
This procedure will drain off any charge stored in the four large capacitors that are part
of the switch board assembly. This procedure MUST be performed, as a safety pre-
caution, before conducting any test or repair procedure that requires you to touch inter-
nal components of the machine.
MATERIALS NEEDED
5/16" Nut Driver
Insulated Pliers
Insulated Gloves
High Wattage Resistor (25-1000 ohms and 25 watts minimum)
DC Volt Meter
This procedure takes approximately 20 minutes to perform.
TROUBLESHOOTING & REPAIR
WARNING
POWER WAVE 355/405
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