Lincoln Electric RANGER 250 SVM150-A Service Manual page 88

F-38
OUTPUT RECTIFIER BRIDGE TEST (continued)
FIGURE F.16 – OUTPUT RECTIFIER BRIDGE LEAD REMOVAL AND TEST POINTS
6. Electrically isolate the output rectifier bridge:
Using the 1/2" wrench, remove stator leads
W1, W2, and W3 from their bolted connec-
tions on the left side of the bridge. Note lead
placement for reassembly. Bend the leads
out into "free air" so that they do not touch
anything. See Figure F.16.
7. Remove any load that may be connected to
the weld output terminals.
8. Check all diode assemblies individually for
opens or shorts. If any of the checks are not
correct, the output rectifier bridge may be
faulty. See the Output Rectifier Bridge
Removal and Replacement procedure.
TROUBLESHOOTING & REPAIR
TOP
W1
CENTER
W2
W3
BOTTOM
RANGER 250
OUTPUT
RECTIFIER
BRIDGE
CHOKE
When all tests are complete:
1. Replace stator leads W1, W2, and W3 to
their respective terminals. Replace lead(s)
#252 or #253 previously removed.
Figure F.16.
2. If finished testing, perform the Case Cover
Replacement procedure.
F-38
See