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F-46

TROUBLESHOOTING & REPAIR

F-46

SCR OUTPUT RECTIFIER REMOVAL AND REPLACEMENT (continued)

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PROCEDURE

1.Remove the case side panels using a 3/8 in. nutdriver.

2.Disconnect lead #208S and trans- former lead X1 from the heat sink on the left side of the machine using a 1/2 in. socket wrench. See Figure F.13.

a.Thin lead is always on the outboard side of the connection.

FIGURE F.13 — LEFT HEAT SINK

LEAD DISCONNECTION.

3.Disconnect lead #204 and heavy alu- minum choke lead from the middle heat sink with a 1/2 in. socket wrench and 1/2 in. open end wrench. See Figure F.14.

4.Remove the diode lead from the nega- tive capacitor band buss bar on the right side of the machine using a 1/2 in. socket and 3/8 in. open end wrench.

FIGURE F.14 — MIDDLE HEAT SINK

LEAD DISCONNECTION.

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MIDDLE

HEAVY

LEFT

HEAT SINK

LEAD LEAD

HEAT SINK

LEAD X1

#204S

 

 

 

LEAD

 

 

#208S

 

POWER MIG 255

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Image 84
Lincoln Electric SVM144-B service manual SCR Output Rectifier Removal and Replacement