Master TOC
TROUBLESHOOTING & REPAIR
AUXILIARY TRANSFORMER #1 SECONDARY AND WIRING HARNESS TEST (continued)
FIGURE F.11 - PLUG AND RECEPTACLE INSPECTION POINTS
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6
5
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3
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
Before continuing with the test procedure, perform the capacitor discharge proce- dure to avoid electric shock.
1
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| 1. | WIRE FEEDER RECEPTACLES | |
2 | 2. | SQUARE WAVE TIG PROTECTION BOARD | ||
3. | DISPLAY BOARD | |||
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| 4. | PROTECTION BOARD | |
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| 5. | CONTROL BOARD | |
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| 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. 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.
