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F-40 F-40
AUXILIARY TRANSFORMER #1 SECONDARY AND WIRING HARNESS TEST (continued)
FIGURE F.11 - PLUG AND RECEPTACLE INSPECTION POINTS
2
3
4
5
6
1
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 Proce-
dure 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,
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. See the
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.
POWER WAVE 450
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WARNING
1. WIRE FEEDER RECEPTACLES
2. SQUARE WAVE TIG PROTECTION BOARD
3. DISPLAY BOARD
4. PROTECTION BOARD
5. CONTROL BOARD
6. POWER BOARD