Lincoln Electric SVM175-A 84TROUBLESHOOTING & REPAIRF-84, Removal Procedure, Discharge procedure

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F-84TROUBLESHOOTING & REPAIRF-84

OUTPUT RECTIFIER BRIDGE AND CHOKE REMOVAL AND REPLACE-

MENT (continued)

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REMOVAL PROCEDURE

1. Turn the engine off.

2. Remove negative battery cable.

3. Perform the

. Case Cover Removal pro- 4. Performc du the Chopper .Module Capacitor

Discharge procedure

5. Remove the four screws holding the case front to the base of the machine.

6. Remove all plugs and leads from the weld control and pull coil PC boards. Be sure to mark the leads and plugs so they can be properly re-connected. See wiring dia- gram.

7. Remove the screws holding the D4 diode bridge and the CR1 engine protection relay to the center baffle assembly, and allow these components to remain attached to the case front wiring.

8. Remove any additional wring and cable ties as needed. Carefully mark leads for accurate re-connection.

9. Swing the case front to the side to permit access to the Output Rectifier and Choke.

Removing the Output Rectifier

10. Remove the heavy leads from the output rectifier. Carefully mark the leads for accurate re-connection, and also note the order and position of multiple lead connections.

11. Remove the nuts and lock washers hold- ing the Output Rectifier to the mounting bracket. You will need to reach through the large access holes on either side of the rectifier to reach these nuts.

12. Remove the Output Rectifier from the machine.

Removing the Output Choke

1. Remove the heavy leads from the choke. Carefully mark the leads for accurate re- connection, and also note the order and position of the leads in multiple lead con- nections.

2. Remove the three long bolts, lock wash- ers and nuts holding the choke the mount- ing bracket in the machine base. Note that there is no bolt in the lower right cor- ner of the choke.

3. Carefully remove the choke.

REPLACEMENT PROCEDURE

Replacing the Output Choke

1. Place the choke into the machine so that the three mounting holes in the choke line up with the holes in the mounting bracket.

2. Insert the three long bolts through the choke and the mounting bracket. Place a lock washer and nut on the end of each bolt and tighten.

3. Reconnect the choke leads. Position the leads, bolts, washers, and nuts exactly as they had been originally connected. Tighten the connection securely.

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RANGER 305D