Troubleshooting & repair – Lincoln Electric MULTI-WELD SVM151-A User Manual
Page 94
TROUBLESHOOTING & REPAIR
F-54
F-54
MULTI-WELD 350
CHOPPER PC BOARD AND DIODE MODULE
REMOVAL AND REPLACEMENT
WARNING
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 trou-
bleshooting assistance before you proceed. Call 1-800-833-9353 (WELD).
DESCRIPTION
This procedure will aid the technician in the removal and replacement of the Chopper PC
Board and the diode module assembly.
MATERIALS NEEDED
3/8" Wrench or socket wrench
7/16" Wrench or socket wrench
1/2" Wrench
3/16" Allen head wrench
9/64" Allen head wrench
Torque wrench with 7/16" hex and 1/4" and 9/64" allen head sockets
Phillips head screw driver
Diagonal cutters
Electrical thermal joint compound – Penetrox A-13
Resistor (25 – 1000 ohms, 25 watts minimum)
Small block of wood (approximately 1" x 3")
This procedure should take approximately 1 hour to perform.