Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B Service Manual page 116

F-56
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.
WARNING
Before continuing with the
test procedure, perform the
capacitor discharge proce-
dure to avoid electric shock.
TROUBLESHOOTING & REPAIR
PIEZO-ELECTRIC ALARM BUZZER TEST
FIGURE F.17 - ALARM BUZZER LOCATION
Capacitor Discharge
POWER WAVE 450
1. LEADS 300, 301 TO PLUG J15 ON
DISPLAY BOARD
2. PIEZO-ELECTRIC ALARM BUZZER
7. After you have completed the capacitor
discharge procedure for all four switch
boards, locate and remove plug J15 from
the display board.
location.
8. Using lead #300 as positive (+) and lead
#301 as negative (-), apply 12 to 15 VDC
to the piezo-electric buzzer.
9. If the buzzer does not work, replace it.
10. If the buzzer does work, the display board
may be faulty. Replace the display board.
Refer to the Display Board Replacement
procedure in this section of the manual.
11. After the test is completed and the prob-
lem successfully repaired, reconnect plug
J15 to the display board.
12. Install the machine case sides and top.
13. Install the handle and the lift bail rubber
gasket.
F-56
See Figure F.17 for