Service Procedures for the PCBs and Related Components
106 810440 Service Parts and Procedures Powermax65/85 SYNC
Replace the output diode bridge
Figure 5 — Output diode bridge 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 2 transformer output cables. Set aside the 2 screws.
4. Remove the 4 mounting screws to remove both output diode bridges from the heatsink.
5. 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.
6. Position the new output diode bridges correctly. Refer to Figure 6.
7. Attach the output diode bridges to the heatsink with 4 mounting screws. Tighten the screws to
4.0 N·m (35 lbf·in).
8. Attach the 2 transformer output cables to the output diode bridges as shown in Figure 6.
Tighten the screws to 2.3 N·m (20 lbf·in).
9. If there is too much thermal grease around the edges of the new component, carefully remove it.
Make sure that the heatsink is clean.
10. Install the power PCB. Refer to page 98.
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