Lincoln Electric SVM104-A service manual J21

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F-23 TROUBLESHOOTING & REPAIR

TRANSISTOR MODULE TEST

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10.Replace the terminal screw snugly, a little more than finger tight. The Transistor Module is mounted behind the Power Board and the terminal screw completes the electrical connection.

11.Perform the following resi- tance tests listed in Table F.1:

NOTE: Meter lead polarity must be observed for these resistance tests.

a. If a low resistance is measured in both polarities, the transistor module is “shorted.” Replace the transis- tor module, the Power Board, and the Control Board.

b. If a high resistance is measured in both polarities, the transistor module is “open.” Replace the transistor module, the Power Board, and the Control Board.

12.Replace all leads.

a.Torque screws to 17 in./lbs. ( 1.9 N.M.)

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H1

LEAD

H2

LEAD

C

LEADS

NEG

LEAD

#40

LEADS

MOUNTING1J21 SCREWS

			J21
H1		40 G1
		B	G2
H2	4J20
	2J20	J20	1J20

C

NEG

#40

3J22 J22 1J22

4J222J22

POWER BOARD

L7941

FIGURE F.9-Transistor Module Test Points

PRO-CUT 60