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TROUBLESHOOTING & REPAIR
F-55 F-55
MULTI-WELD 350
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MULTI-WELD 350
LINCOLN
ELECTRIC
AMPS
VOLTS
A
V
ELECTRO DE
INPUT
WORK
CHOPPE R TECHNOLOGY
4 SCREWS
ACCESSED
FROM BOTTOM
+
-
CAPACITOR
POSITIVE
STRAP
HEX-HEAD
BOLTS (2)
REVERSE
DIODE LEAD
CONNECTION
CHOPPER
PC BOARD
ALLEN-HEAD
SCREWS (2)
FIGURE F. 14 – CHOPPER PC BOARD AND DIODE MODULE CONNECTIONS
CHOPPER PC BOARD REMOVAL AND REPLACEMENT (CONTINUED)
REMOVAL
Refer to Figure F.14.
1. Set the CC/CV power switch to OFF.
2. Remove input power to the machine.
ELECTRIC SHOCK can kill.
Disconnect input power before removing the
case cover and performing tests or making
repairs to the machine.
WARNING