Lincoln Electric 355M, 405M Troubleshooting and Repair, Main Switch Board Removal and Replacement

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F-17	TROUBLESHOOTING AND REPAIR	F-17
	MAIN SWITCH BOARD TEST (continued)

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6.If any test fails replace the switch board. See

Main Switch Board Removal and Replacement.

7.If the switch board resistance tests are OK, check connections on plugs J20, J21, J22 and all asso- ciated wiring. See wiring diagram.

8.Reconnect leads 201, 202, 203, 204, 205, 206, 207, and 208 to the switch board. Ensure that the leads are installed in their proper locations. Pre- Torque all leads nuts to 25 inch lbs. before tight- ening them to 44 inch lbs.

9.Replace the case wraparound cover using a 5/16” nut driver.

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TABLE F.1. SWITCH BOARD RESISTANCE TEST

APPLY POSITIVE TEST	APPLY NEGATIVE TEST	NORMAL
PROBE TO TERMINAL	PROBE TO TERMINAL	RESISTANCE READING
+206	-205	Greater than 1000 ohms
+208	-203	Greater than 1000 ohms
+202	-204	Greater than 1000 ohms
+201	-207	Greater than 1000 ohms
+205	-206	Less than 100 ohms
+203	-208	Less than 100 ohms
+204	-202	Less than 100 ohms
+207	-201	Less than 100 ohms

POWER WAVE 355M/405M