Lincoln Electric SVM179-B service manual PC BOARD Removal and Replacement Procedure

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F-30 TROUBLESHOOTING & REPAIR F-30

PC BOARD REMOVAL AND REPLACEMENT PROCEDURE (CONTINUED)

FIGURE F.11 – CONTROL PC BOARD LOCATION

CONTROL BOX

CONTROL BOARD

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REMOVAL PROCEDURE

1.Perform the Case Removal Procedure.

2.Remove the 5 #10-24 x .50 screws holding the control box cover to access the contactor leads. See Figure F.2.

3.Disconnect the gas hose and the buss bar from the drive deck.

4.Remove the five #10-24 x .50 screws from the wire drive panel and separate the panel from the box to access the control board.

5.Locate the control board and remove the har- ness plugs on the control board. Observe sta- tic electricity precautions. Label plugs for reassembly. See Figure F.11.

6.Remove the 4 nuts holding the board using the 3/8 inch nut driver, and remove the board.

CONTROL BOX COVER

REPLACEMENT PROCEDURE

1.Remove the new control board from the static bag and place it on the 4 studs.

2.Reassemble the 4 nuts and tighten hand tight.

3.Reassemble the harness plugs.

4.Replace the wire drive panel and control box assembly in reverse order.

5.Reconnect the buss bar and the gas hose.

6.Replace the control box cover.

7.Slide the control box into the case and secure it in reverse order.

LN-25™ PRO