Front, Negative lead, Troubleshooting and repair – Lincoln Electric POWER MIG SVM157-A User Manual
Page 54: Output bridge rectifier test (continued)
TROUBLESHOOTING AND REPAIR
F-20
F-20
POWER MIG 200
OUTPUT BRIDGE RECTIFIER TEST (continued)
TEST PROCEDURE
1. Remove input power to the POWER
MIG 200 machine.
2. Using the 3/8” nutdriver, remove the left
case side.
3. Locate and disconnect the negative lead
from the output rectifier bridge assembly.
Be sure there is no electrical contact
between the rectifier and the lead. See
Figure F.6.
NOTE: Do not disassemble the rectifier
assembly.
4. Test for “shorted” or “leaky” diodes by
checking from the anodes to the cathodes
of the diode heatsink plates. The
readings should be high resistance in
one polarity and low resistance in the
opposite polarity.
5. If any of the diodes are “leaky” or
“shorted” the output rectifier assembly
should be replaced.
6. When the test is complete, replace the
negative output lead previously removed.
7. Replace the left case side.
Front
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Negative Lead
Figure F.6. Rectifier Test Points