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TROUBLESHOOTING & REPAIR
F-21 F-21
MULTI-WELD 350
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MULTI-WELD 350
LINCOLN
ELECTRIC
AMPS
VOLTS
A
V
ELECTRODE
INPUT
WORK
CHOPPER TECHNOLOGY
P42
P41
ANALOG
CONTROL
POWER
SUPPLY
PC BOARD
1 2 3 4 5
6 7 8 9 10
1 2
3 4
P41
P42
FIGURE F.4 – ANALOG CONTROL POWER SUPPLY PC BOARD
ANALOG CONTROL POWER SUPPLY PC BOARD 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.
5. Locate the Analog Control Power Supply
PC Board and plugs P41 and P42. See
Figure F.4.
6. Carefully apply the correct input power to
the Multi-Weld 350 (50 – 113 VDC).
7. Set the Multi-Weld 350 to either CC or CV
mode. Make sure the input contactor acti-
vates. If it does not, increase the input volt-
age but do not exceed 113 VDC. The LED
on the DC Buss Power Supply PC Board
should light.
8. Check the Analog Control Power Supply PC
Board input and output voltages according
to Table F.1. See Figure F.4 and the Wiring
Diagram.
WARNING