Tweco 81 with SL100SV - Manual (Page 111)

Manual 0-4641 5-47 SERVICE
5
H. Heatsink Shroud Assembly Replacement
1. Pass transformer wires #45 and 49 through the upper hole in the right (rear) edge of the Heatsink Shroud. Pass trans-
former wires #47 and 52 through the lower hole.
2. Route wires as follows:
a. Pass the red wires from the output inductor through the upper hole in the right (rear) edge of the Heatsink Shroud.
b. Pass the black wires from the output inductor through the lower hole in the right (rear) edge of the Heatsink Shroud.
Refer to Appendix 11, Power Output Board Layout.
c. Pass the wires from the temperature switch on the Output Inductor through the upper hole in the Shroud.
3. Re-install the Heatsink Shroud as follows:
a. Lift the Heatsink Shroud (Assembly) into position. Studs on the Power Supply base pass through holes in the
bottom flange of the Shroud.
b. Swing the top edge of the Shroud Assembly into place. Studs on the Center Chassis of the Power Supply pass
through holes in the top flanges of the Shroud.
c. Ensure that the rubber feet on the Main Transformer engage holes in the Shroud.
d. Put hex nuts on the studs. Tighten the nuts on the right (rear) top and bottom studs. Leave the nuts on the left
(forward) studs loose temporarily.
4. Put the Fan Assembly in place per subsection 5.12-A. Reconnect the work cable to terminal E61 on the Power Output
PC Board.
5. Tighten the nuts securing the left edge of the Heatsink Shroud Assembly. The stud and nut on the bottom left edge
fasten a wire stay to the Power Supply.
6. Replace the grommets around the wire harnesses passing through the right (rearward) edge of the Heatsink Shroud.
7. Reinstall the Pilot Board. Reconnect the wires to the Pilot Board.
Reconnect the torch receptacle ground wire to the center chassis.
9. Replace the Pressure Switch/Solenoid Assembly. This assembly fits into a slot in the top horizontal surface of the
Heatsink Shroud. A notched pin holds the assembly in place.
10. Connect the gas hose between the Regulator/Filter Assembly and the Gas Pressure Switch/Solenoid Assembly.
11. Connect wiring to the Output Power PC Board. Refer to the Appendix pages for wiring layout.
12. Replace the Power Supply rear panel per subsection 5.07-D.
This concludes the replacement procedures.