Lincoln Electric 11141 Service Manual page 77

F-31
6. Check the DC Bus Board input and output
voltages according to Table F.4. See Figure
F.7 and the Wiring Diagram.
WARNING
ELECTRIC SHOCK can kill.
High voltage is present at the ter-
minals of Capacitor C3 near
where testing is to be done.
TABLE F.4 – DC BUS POWER SUPPLY PC BOARD VOLTAGE TABLE
Positive Meter Probe
Test Point
Plug P46 – Pin 1
Lead 65
Plug P47 – Pin 8(+)
Lead 52
Plug P47 – Pin 3(+)
Lead 477
TROUBLESHOOTING AND REPAIR
DC BUS BOARD TEST(CONTINUED)
Negative Meter Probe
Test Point
Plug P46 – Pin 3
Lead 66
Plug P47 – Pin 1(-)
Lead 51
Plug P47 – Pin 6(-)
Lead 475
POWER WAVE
7. If all the voltages are correct, the DC Bus
Board is operating properly.
8. If any of the output voltages are not correct
and the input voltage is correct, the DC Bus
Board may be faulty.
9. If the input voltage is not correct, check the
leads between the DC Bus Board and the
Bus Rectifier. See the Wiring Diagram.
10. When finished testing, replace the case
wraparound cover.
Approximate Voltage
Reading
65 – 75 VDC
38.0 – 42.0 VDC
38.0 – 42.0 VDC
® 355M/405M
F-31
Conditions/Comments
Should be same as the
Bus Rectifier
Supply to the Wire
Feeder Receptacle
Supply to Power Board