Lincoln Electric POWER MIG SVM165-A Service Manual page 70

F-24
TEST PROCEDURE
1. Find the following leads at the control rectifier using
figures F.5 and F.6.
From Lead
To Lead
471B
472B
X5 X6
TROUBLESHOOTING & REPAIR
CONTROL RECTIFIER TEST (continued)
FIGURE F.5
115 VAC 30 VAC
X5 X6
X3 X4
CONTROL RECTIFIER
FAN
Expected Voltage
42 VDC
30 VAC
FIGURE F.6
CONTROL RECTIFIER
POWER MIG 350MP
LOCATED ON
TRANSFORMER
BAFFLE
+ 42VDC
+
6800/75
2. Carefully connect the meter probes to the exposed
lead connections.
3. Turn the machine ON to conduct the voltage test.
4. If the DC voltage tested is incorrect or missing, and
the AC voltages are correct, the control rectifier
bridge or capacitor may be faulty.
F-24