Tweco 151 with SL100SV - Manual (Page 102)

SERVICE 5-34 Manual 0-4691
5
E. IGBT Replacement
1. Note the placement of all wires to the IBGT(s) being replaced.
2. Carefully remove the 3 sets of hardware securing each IGBT PC board being replaced to the IGBT module
mounted to thepower supply heat sink. Keep the hardware for re-use.
3. Carefully remove the IGBT module(s) being replaced and set them aside on a clean, dry surface.
4. Carefully remove the hardware securing the IGBT module(s) being replaced to the power supply heat sink.
Keep the hardware for re-use.
5. Use isopropyl alcohol and a clean rag to clean the heat sink area behind the component being replaced. Clean
the large flat surface on the back of the replacement component. Do not scratch or abrade the surface.
CAUTION
The component mounting area, and the mounting surface of the IGBT module, must be free of debris, pits, scratches, or
other imperfections which could make the component lift off the mounting surface.
6. Apply a thermal pad to the large flat surface of the module.
2
Art # A-04642
1
Thermal Pads
Heatsink
Heatsink
7. Secure replacement module(s) with the hardware removed previously. Ensure that the washers are under the heads of the
screws.
8. Torque screw(s) to 35 in-lb. (3.95Nm).
NOTE
Failure to torque properly will cause component damage.