Service Procedures for the PCBs and Related Components
108 810440 Service Parts and Procedures Powermax65/85 SYNC
Replace the input diode bridge
Figure 7 — Input 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 mounting screws to remove the input diode bridge from the heatsink.
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 input diode bridge correctly. Refer to Figure 8. It has a different position in
CE/CCC systems than it does in CSA systems.
6. Attach the input diode bridge to the heatsink with the 2 mounting screws. Tighten the screws to
2.3 N·m (20 lbf·in).
7. If there is too much thermal grease around the edges of the new component, carefully remove it.
Make sure that the heatsink is clean.
8. Install the power PCB. Refer to page 98.
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