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TROUBLESHOOTING & REPAIR
OUTPUT RECTIFIER BRIDGE TEST (continued)
FIGURE F.4 - OUTPUT RECTIFIER BRIDGE
203
Strap
W2
W1
204
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TEST PROCEDURE
1.Conduct this test with the gasoline engine OFF.
2.Remove the spark plug wire to prevent accidental engine kickback or starting.
3.With the 5/16" nut driver, remove the 8 sheet metal screws that hold the top cover to the control box. Remove the top cover.
4.Locate the output rectifier bridge.
5.With the 7/16" wrench, remove the nuts and washers that hold the four diode pigtail leads and the heavy current carrying leads to the studs located at the front of the rec- tifier bridge assembly. Note lead place- ment for reassembly. See Figure F.4.
6.Electrically isolate the diode pigtails.
7.With the volt/ohmmeter or diode tester, check the resistance of each of the four diodes from their pigtail leads to their respective heat sinks. Alternate placement of the test probes. Resistance should be high in one direction and low in the other.
8.Replace any shorted or open diodes.
9.Reassemble the heavy current carrying leads and pigtails to their respective studs. The proper fastener sequence is: pigtail - lead - flat washer - lock washer - nut.
10.Replace the top cover on the control box. Tighten the 8 sheet metal screws with the 5/16" nut driver.
WELDANPOWER 125
