Lincoln Electric SVM101-B service manual Power Board Test, Test a, Test B

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F-48 TROUBLESHOOTING & REPAIR F-48

POWER BOARD TEST (cont.)

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TEST PROCEDURE

NOTE: Perform Test A before disassembling the unit

Test A

1.Turn main power OFF.

2.Position yourself at Switch Board area of the machine (near Case Back) so as to hear the oper- ation of the control relays.

3.Turn main power ON.

4.Listen for control relays to operate (audible click of contacts closing) after about a 5-second delay.

a.If audible click of control relay contacts closing is heard, Power Board is probably OK.

b.If audible click of control relay contacts closing is not heard, Power Board could be faulty. Go to Test B.

NOTE: If the relays energize but there is still a suspicion that the Power Board is faulty, go on to

Test B.

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FIGURE F.22 - REMOVING CONTROLPANEL

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Test B

1.Turn main power OFF.

2.Remove wrap-around cover.

3.Perform Input Filter Capacitor Discharge proce- dure.

4.Detach Control Panel by removing the four mount- ing screws. Move the panel to the left to gain access to the Power Board.

5.Turn main power ON.

V300-I