Service Procedures for the PCBs and Related Components
11 2 810440 Service Parts and Procedures Powermax65/85 SYNC
Replace the inverter IGBT and the thermal sensor
The inverter IGBT and the thermal sensor are sold as different kits. The thermal sensor does not
come with the inverter IGBT. Refer to page 105.
Figure 11 — Inverter IGBT and thermal sensor on heatsink
1. Set the plasma power supply switch to OFF (O), disconnect the power cord from the power
source, and disconnect the gas supply.
2. Remove the power PCB. Refer to page 98. Make sure that you put the power PCB in an
anti-static bag until you are prepared to install it.
3. Remove the 4 mounting screws to remove the inverter IGBT from the heatsink. Set aside the
thermal sensor if you are not replacing it.
4. Correctly clean the heatsink and apply thermal grease to the new component before you
install it. Refer to How to clean the heatsink and apply thermal grease to the heatsink
components on page 118.
5. Position the new inverter IGBT correctly. Refer to Figure 12.
6. Attach the inverter IGBT to the heatsink with the mounting screws, as follows. Tighten the
screws to 4.0 N·m (35 lbf·in).
Install 1 mounting screw in the top right corner.
65 A CSA models: Install 1 mounting screw at the bottom of the IGBT.
85 A CSA models and 65 A/85 A CE/CCC models: Install 2 mounting screws in the
2bottom corners.
Use the last mounting screw to attach the ring-terminal end of the thermal sensor to the top
left corner of the inverter IGBT. Refer to Figure 12.
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