Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B Service Manual page 100

F-40
AUXILIARY TRANSFORMER #1 SECONDARY AND WIRING HARNESS TEST (continued)
FIGURE F.11 - PLUG AND RECEPTACLE INSPECTION POINTS
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 Proce-
dure described earlier in this section of the
manual.
WARNING
TROUBLESHOOTING & REPAIR
Before continuing with the
test procedure, perform the
capacitor discharge proce-
dure to avoid electric shock.
POWER WAVE 450
1. WIRE FEEDER RECEPTACLES
2. SQUARE WAVE TIG PROTECTION BOARD
3. DISPLAY BOARD
4. PROTECTION BOARD
5. CONTROL BOARD
6. POWER BOARD
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. Disconnect all plugs and wirefeeder recep-
tacles associated with the auxiliary trans-
former secondary. This is done to isolate
the machine electrically. Inspect all the dis-
connected plugs and receptacles, looking
for shorted pins and wires.
Auxiliary Transformer #1 Secondary Circuit
Wiring Diagram, Figure F.12, for the specif-
ic plugs and receptacles to check, which
include:
• WF2 Receptacle
• WF1 Receptacle
• Square Wave TIG Protection Board
• Display Board
• Power Board
• Protection Board
9. Check for shorts on the associated PC
boards. See the Auxiliary Transformer #1
Secondary Circuit Wiring Diagram, Figure
F.12.
F-40
See the