Lincoln Electric MULTI-WELD SVM151-A Service Manual page 95

F-55
CHOPPER PC BOARD REMOVAL AND REPLACEMENT (CONTINUED)
FIGURE F. 14 – CHOPPER PC BOARD AND DIODE MODULE CONNECTIONS
A M
L IN
C O
E L L N
E C
T R
IC
IN
P U
T
REMOVAL
Refer to Figure F.14.
1. Set the CC/CV power switch to OFF.
2. Remove input power to the machine.
TROUBLESHOOTING & REPAIR
P S
A
V O
L T S
V
E L
W O E C
T R
R K
O D
E
MULTI-WELD 350
ALLEN-HEAD
SCREWS (2)
CHOPPER
PC BOARD
CAPACITOR
POSITIVE
STRAP
+
-
REVERSE
DIODE LEAD
CONNECTION
HEX-HEAD
BOLTS (2)
4 SCREWS
ACCESSED
FROM BOTTOM
WARNING
ELECTRIC SHOCK can kill.
Disconnect input power before removing the
case cover and performing tests or making
repairs to the machine.
F-55