Examine the relays

  1. Examine the relays for black or rough surfaces:
    • For XPR170® and XPR300®, remove the cover from the pilot-arc relay in the plasma power supply.
      Figure 1. Location of the pilot-arc relay for XPR170 and XPR300
      This image shows the location of the pilot-arc relay in the XPR170and XPR300plasma power supply.
    • For XPR460®, remove the covers from the pilot-arc relay and the cooler-power relay in the plasma power supply.
      Figure 2. Location of the pilot-arc relay and cooler-power relay for XPR460
      This image shows the locations of the pilot-arc relay and the cooler-power relay in the plasma power supply .
      1 Pilot-arc relay
      2 Cooler-power relay
  2. Examine the contacts in the relay.
  3. If you find unwanted black or rough surfaces, replace the relay.
  4. Carefully install the cover of the relay.
    Note:

    Do not pinch the wires between the cover and the panel.