Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B Service Manual page 232

F-172
INPUT RECTIFIER REMOVAL AND REPLACEMENT (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.65 - INPUT RECTIFIER LOCATION
Capacitor Discharge
POWER WAVE 450
CR1
1. MAIN CONTACTOR
2. M.O.V. ASSEMBLY
3. SILICONE SEALANT
4. INPUT RECTIFIER
5. 5MM ALLEN SCREW
6. HEAT SINK PANEL
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,
peel the silicone sealant away from the
M.O.V. assembly in order to expose the
heads of the screws that attach the three
heavy leads from the main input contactor
to the input rectifier. See Figure F.65.
8. With the Phillips head screw driver, remove
the three heavy leads from the input
rectifier.
9. With the Phillips head screw driver, remove
the positive (+) and negative (-) leads from
the input rectifier.
F-172