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TROUBLESHOOTING & REPAIR
F-22 F-22
INVERTEC STT
T4 AUXILIARY TRANSFORMER TEST (continued)
7. Carefully lift and tilt the Invertec STT
machine onto its right side. See Figure F.6.
8. Using the 7/16" wrench, remove the five
bolts holding the lower tray assembly to the
case bottom.
9. Carefully slide out and support the lower tray
assembly for testing purposes.
10. Locate and remove plug J13 from the
IGBT drive board. See Figure F.7.
FIGURE F.6 – STT ON ITS RIGHT SIDE
MOUNTING
BOLTS (5)
FIGURE F.7 – PLUG J13 LOCATION
T4 AUXILIARY
TRANSFORMER
PLUG J13
IGBT
DRIVE BOARD
STT II