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TROUBLESHOOTING & REPAIR
MAIN TRANSFORMER/CHOKE REMOVAL AND REPLACEMENT (continued)
FIGURE F.75 - MAIN TRANSFORMER LOCATION
1. MAIN TRANSFORMER
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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 Procedure described earlier in this section of the manual.
WARNING
Before continuing with the test procedure, perform the capaci- tor discharge procedure to avoid electric shock.
1
7.After you have completed the capacitor dis- charge procedure for all four switch boards, perform the FET Module Assembly Removal Procedure. Refer to the proce- dure in this section of the manual. After the FET module assembly has been removed, the main transformer and chokes are easily accessible.
8.With the 3/8" socket wrench, remove the four main transformer mounting bolts.
9.Disconnect the heavy leads between the main transformer and the choke assembly. You will need to cut the cable ties on the insulating sleeve and slide the sleeve for- ward to access the connection.
10.Lift the main transformer out. Remove the background or output chokes if necessary by removing any mounting bolts holding the chokes to the machine frame bottom.
11.After reassembly test on high voltage input and reconnect.
