Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B Service Manual page 236

F-176
PRINTED CIRCUIT BOARD REMOVAL AND REPLACEMENT
(CONTROL BOARD, POWER BOARD, AND PROTECTION BOARD) (continued)
PROCEDURE
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.
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
Procedure described earlier in this section
of the manual.
TROUBLESHOOTING & REPAIR
FIGURE F.66 - PC BOARD REMOVAL
Capacitor Discharge
POWER WAVE 450
1. PC BOARD COVER
2. PC BOARD ASSEMBLY
3. RETAINER CLIPS
WARNING
Before continuing with the
test procedure, perform the
capacitor discharge proce-
dure to avoid electric shock.
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.
F-176