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TROUBLESHOOTING & REPAIR
INPUT POWER AND WIRING HARNESS TEST
FIGURE F.13 - INPUT POWER INSPECTION POINTS
2
3
1
1. POWER SWITCH (S1)
2. MAIN CONTACTOR INPUT LEADS (TOP)
3. PROTECTION BOARD
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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 Pro- cedure described earlier in this section of the manual.
WARNING
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.Manually check the power switch (S1) for proper operation by turning it back and forth. At the back of the front panel where the switch is mounted, make a visual inspection. Be sure the input and output leads are not shorted together. Make sure the switch contacts are not fused together or shorted to another phase. (Because of the high input voltage involved, you should be able to see physical evidence if any of these problems exist.) Remove the tape covering the switch and check the switch with an ohmmeter. High resistance should be present.
Before continuing with the test procedure, perform the capacitor discharge proce- dure to avoid electric shock.
