Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B Service Manual page 196

F-136
J17
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
LCD DISPLAY TEST (continued)
FIGURE F.51 - DISPLAY BOARD PLUG LOCATIONS
J16 J15 J14 J13 J12 J11
Capacitor Discharge
POWER WAVE 450
J10
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,
remove the PC board cover. Use the 5/16"
nut driver.
8. Remove the 5 leads ( 3 heavy and 2 small)
T1, T2, T3 from main input contactor CR1.
This is a safety precaution. It prevents high
voltage from being put on the machine dur-
ing the test. Wrap tape around the lead
ends to insulate them and prevent them
from touching.
9. Remove plug J30 from the protection
board. See Figure F.1 for location of the
board and plug J30.
F-136