Lincoln Electric INVERTEC SVM129-B Service Manual page 101

F-63
SWITCH BOARD REPLACEMENT (continued)
WARNING
ELECTRIC SHOCK can kill.
8. With the machine connected for 440/460 volt
operation and the proper input voltage
applied, turn on input power to the machine.
TROUBLESHOOTING & REPAIR
• With input power ON, there
are high voltages in the
machine. Do not reach
into the machine or touch
any internal part.
INVERTEC STT
9. With the output free of a load, check open cir-
cuit voltages of the output. Voltage should be
85 VDC maximum.
10. Remove input power.
5-amp fuses from the input supply fuse hold-
ers.
11. Install 20-amp fuses and test under load.
NOTE: A resistive-type grid load bank is recom-
mended.
14. Perform Retest After Repair.
F-63
Then remove the