Service Procedures for the PCBs and Related Components
116 810440 Service Parts and Procedures Powermax65/85 SYNC
Replace the snubber resistors and the damper resistor
The resistors are sold individually. Snubber resistors can look the same but have different resistance
ratings. Refer to page 105 for the correct replacement part numbers.
Only CSA models have damper resistors.
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. Identify the resistors to replace. Refer to Figure 15 and Figure 16.
4. To remove a snubber resistor and its 2 standoffs, remove the 2 mounting screws.
5. To remove the damper resistor, remove the 2 mounting screws.
6. 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.
7. Attach the snubber resistors to the heatsink with the mounting screws. Tighten the screws to
2.3 N·m (20 lbf·in). Each resistor has 2 mounting screws. Refer to Figure 15 and Figure 16.
8. For each new snubber resistor, put the 2 standoffs into the holes in the snubber resistor. Tighten
the standoffs to 1.1 N·m (10 lbf·in).
9. Attach the damper resistor to the heatsink with the 2 mounting screws. Tighten the screws to
1.1N·m (10lbf·in).
10. If there is too much thermal grease around the edges of the new component, carefully remove it.
Make sure that the heatsink is clean.
11 . Install the power PCB. Refer to page 98.
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