Lincoln Electric COMMANDER SVM153-A Service Manual page 98

F-45
OUTPUT RECTIFIER BRIDGE TEST(CONTINUED)
WELD WINDING
LEAD CONNECTIONS
9. Using the 7/16" wrench, remove the stator
leads and diode pigtail leads from the three
studs.
Note leads and pigtail placement for
reassembly. See Figure F.20.
10. Electrically isolate the six diode pigtail
leads by carefully bending them out into
"free air."
11. With an ohmmeter or diode tester, check
each of the six diodes from their pigtails to
their respective heat sinks.
12. Reverse the tester leads and check the
diodes again. Diodes should have a low
resistance in one polarity and a very high
resistance in the opposite polarity.
TROUBLESHOOTING & REPAIR
FIGURE F.20 – DIODE LEAD REMOVAL
Label the leads for reassembly.
COMMANDER 500
W6
W2
W4
13. Replace any "shorted" or "open" diode as
the tests indicate. See the Diode Removal
and Replacement Procedure.
14. Replace the pigtails and stator leads onto
the correct studs. Assemble the washers
and nuts.
15. Replace the lower front panel and output
leads.
16. Replace the upper control panel and
secure.
17. Replace the front left and right case sides.
F-45
W1
W3
W5