Troubleshooting & repair, Warning – Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B User Manual

Page 108

F-48

INPUT RECTIFIER RESISTANCE TEST

(continued)

FIGURE F.15 - RECONNECT SWITCH LOCATION

TROUBLESHOOTING & REPAIR

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

Capacitor Discharge

Procedure described earlier in this section
of the manual.

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. Twist the
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.

POWER WAVE 450