Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B Service Manual page 108

F-48
INPUT RECTIFIER RESISTANCE TEST (continued)
1. RECONNECT SWITCH
2. INPUT RECTIFIER
3. MAIN CONTACTOR
TEST 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.15 - RECONNECT SWITCH LOCATION
Capacitor Discharge
POWER WAVE 450
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
5/16" sheet metal screws holding the
reconnect switch assembly.
reconnect switch out to access the lead
connections on the back.
8. Use the 3/8" wrench to disconnect the two
negative leads from the reconnect switch.
By disconnecting the leads at the recon-
nect switch, you will not have to disturb the
silicon applied to the input rectifier.
Electrically isolate the leads from all other
leads.
F-48
Twist the