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TROUBLESHOOTING & REPAIR
F-27 F-27
MULTI-WELD 350
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MULTI-WELD 350
LINCOLN
ELECTRIC
AMPS
VOLTS
A
V
ELECTRODE
INPUT
WORK
CHOPPER TECHNOLOGY
COPPER
CAPACITOR
NEGATIVE
STRAP
LEADS
#X1
#X4
#401
#401A
+
-
REMOVE CASE
BACK PANEL
TO ACCESS
HEAT SINK
TEST POINT
(4 SCREWS)
DIODE
D5
COPPER
CAPACITOR
POSITIVE
STRAP
1 2 3
4 5 6
P45/45A
CLAMP
BRACKET
IGBT
HEAT
SINK
DIODE
MODULE
D3
FIGURE F.6 – POWER MODULE ASSEMBLY DETAILS
CHOPPER PC BOARD INPUT VOLTAGES AND
RESISTANCE TEST (CONTINUED)
TEST PROCEDURE
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.
3. Perform the Case Cover Removal proce-
dure.
4. Perform the Power Module Capacitor
Discharge procedure.
WARNING