Lincoln Electric SVM153-A service manual Figure F.20 Diode Lead Removal

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F-45	F-45
	TROUBLESHOOTING & REPAIR

OUTPUT RECTIFIER BRIDGE TEST(CONTINUED)

FIGURE F.20 – DIODE LEAD REMOVAL

W6W1

W2	W3
W4	W5

WELD WINDING

LEAD CONNECTIONS

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9.Using the 7/16" wrench, remove the stator leads and diode pigtail leads from the three studs. Label the leads for reassembly. 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.

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.

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COMMANDER 500