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TROUBLESHOOTING & REPAIR
OUTPUT RECTIFIER REMOVAL AND REPLACEMENT (continued)
FIGURE F.39 – CHOKE LEAD/HEAT SINK CONNECTION
HEAT SINK TAB
CHOKE LEAD
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PROCEDURE
1.Turn off Invertec STT and disconnect main AC input power to the machine.
2.Using the 5/16" nut driver, remove the case wraparound cover.
3.Perform the Input Filter Capacitor Discharge Procedure. See the Maintenance section.
WARNING
ELECTRIC SHOCK can kill.
•Before continuing with the test procedure, per- form the capacitor dis- charge procedure to avoid electric shock.
4.Using the slot head screw driver, loosen the input cable strain relief.
5.Using the 5/16" nut driver, remove the four screws securing the case back to the inter- nal horizontal baffles.
6.Carefully pull the case back away from the output rectifier assembly.
NOTE: The case back will NOT detach from the case bottom.
7.Using the 7/16" wrench, remove the four bolts and washers mounting the fan motor bracket to the top horizontal baffle. Carefully set the fan and motor assembly aside. Note insulation placement for reassembly.
NOTE: The fan motor leads do NOT have to be cut.
8.Using the 7/16" wrench, remove the choke lead from the heat sink tab. See Figure F.39.
