Lincoln Electric POWER WAVE 355M - Manual (Page 75)

TROUBLESHOOTING AND REPAIR F-29 F-29
POWER WAVE 355M/405M
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DC BUS BOARD TEST(CONTINUED)
6. Check the DC Bus Board input and output
voltages according to Table F.4. See Figure
F.6 and the Wiring Diagram.
ELECTRIC SHOCK can kill.
High voltage is present at the ter-
minals of Capacitor C3 near
where testing is to be done.
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.
Plug P46 – Pin 1
Lead 65
Plug P47 – Pin 8(+)
Lead 52
Plug P47 – Pin 3(+)
Lead 477
Plug P46 – Pin 3
Lead 66
Plug P47 – Pin 1(-)
Lead 51
Plug P47 – Pin 6(-)
Lead 475
65 – 75 VDC
38.0 – 42.0 VDC
38.0 – 42.0 VDC
Should be same as the
Bus Rectifier
Supply to the Wire
Feeder Receptacle
Supply to Power Board
Positive Meter Probe
Test Point
Negative Meter Probe
Test Point
Approximate Voltage
Reading
Conditions/Comments
TABLE F.4 – DC BUS POWER SUPPLY PC BOARD VOLTAGE TABLE
WARNING