Component ReplaCement
powermax
65/85
Service Manual 6-29
Replace the heat sink components
This section describes the procedures for replacing heat sink components for the 65A CSA, 65A CE, 85A CSA, and
85A CE models. Refer to the figures following the instructions for your particular model.
1. Turn OFF the power, disconnect the power cord, and disconnect the gas supply.
2. Remove the power supply cover and Mylar barrier. Refer to page 6-2 Remove and replace the power supply
cover and Mylar
®
barrier.
3. Remove the power board to expose the heat sink. Refer to the instructions in the section beginning on page 6-17
Replace the power board.
4. Remove the old components from the heat sink.
5. Use isopropyl alcohol to remove the old thermal grease.
6. Install the new components to the heat sink as shown in the appropriate figure below.
7. Use thermal grease on all components. Apply a thin coat (3 mils or paper equivalent) to the component.
8. Gently tighten all screws and then tighten all screws to the required torque. Refer to the appropriate figure below
for torque specifications.
9. Clean the excess grease from the heat sink.
10. Replace the power board.
11. Replace the Mylar barrier and power supply cover. Refer to page 6-2 Remove and replace the power supply
cover and Mylar
®
barrier.
12. Reconnect the electrical power and the gas supply.
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