Lincoln Electric SVM112-B service manual FET Module Removal and Replacement, Procedure

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F-192 TROUBLESHOOTING & REPAIR F-192

FET MODULE REMOVAL AND REPLACEMENT (continued)

FIGURE F.73 - FET MODULE LOCATION

4

3

1

1. FET MODULE

2. PIEZO ALARM BUZZER

3. FET MODULE LOCKING BAR

4. RESISTORS

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PROCEDURE	WARNING

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1.Remove main input supply power to the machine.

2.With the 3/8" nut driver, remove the 4 screws that hold the handle to the machine.

3.Remove the rubber gasket (cover seal) from the lift bail.

Before continuing with the test procedure, perform the capacitor discharge proce- dure to avoid electric shock.

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4.With the 5/16" nut driver, remove the sheet metal screws from the case top.

5.With the 5/16" nut driver, remove the screws holding the right and left case sides. Remove the case sides by lifting up and out.

6.Perform the Capacitor Discharge Proce- dure described earlier in this section of the manual.

7.After you have completed the capacitor dis- charge procedure for all four switch boards, use the 5/16" nut driver to remove the two screws holding the printed circuit board cover in place. Slide the cover forward and lift up to remove it.

CAUTION

Be sure to follow the recommended static-free methods for handling printed circuit boards. Failure to do so can result in permanent dam- age to the equipment.

8.Remove the molex plugs from the PC boards except the display board.

POWER WAVE 450