Lincoln Electric 405M, 355M service manual J42 J41 J43, Test Procedure

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F-24	TROUBLESHOOTING AND REPAIR									F-24
			FIGURE F.4 – POWER BOARD TEST
	J42			J41			J43
6	5	4	4		3	12 11 10 9		8	7

3	2	1		2	1		6	5	4	3	2	1
			J42			J41	J43

TEST PROCEDURE

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1.Remove input power to the Power Wave 355M/405M.

2.Using the 3/8” nut driver, remove the case top.

3.Perform the Capacitor Discharge Procedure.

4.Locate the Power Board and plugs J42 and J43. Do not remove plugs or leads from the Power Board. Refer to Figure F.8.

5.Carefully apply input power to the Power Wave 355M/405M.

6.Turn on the Power Wave 355M/405M. Carefully test for the correct voltages at the Power Board according to Table F.4.

7.If either of the 40 VDC voltages is low or not present at plug J41, perform the DC Bus PC Board Test. See the Wiring Diagram. Also perform the T1 Auxiliary Transformer

Test.

8.If any of the DC voltages are low or not pre- sent at plugs J42 and/or 43, the Power Board may be faulty.

9.Install the case top using the 3/8” nut driver.

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WARNING

ELECTRIC SHOCK can kill.

High voltage is present when input power is applied to the machine.

POWER WAVE 355M/405M