• Topic ID: id_17423047
  • Version: 4.0
  • Date: Jan 20, 2020 8:33:37 PM

Gantry Top Fan Replacement

Prerequisites

Overview

The top fans are controlled by the stationary CFC board. You can swap the fan connections to verify that the fan is defective.

1 Cover Removal

Procedure

    Notice Image
    • warning
    • Potential for Shock.
    • Voltage may be present. Potential for injury if covers removed and power is left ON.
    • Always remove the right side cover first, and turn OFF power at the service switches.
  1. Remove gantry right side cover.

    Refer to Parts Replacement > Gantry > Enclosure > (Cover Removal Procedure).

  2. Stop the rotor of X-ray tube in case of Liquid Bearing Tube before HVDC off. Refer to Liquid Bearing Tube Rotor stop procedure for details.
  3. Turn OFF the three (3) main power switches (Axial Drive, HVDC and 120VAC) on the Service Switch Panel.
  4. Remove the applicable top cover and slide the rear cover backward.

2 Top Fan Assembly Replacement

Procedure

  1. Loosen the lock screw of the top fan assembly, and rotate the top fan assembly.

    Figure 1. Lock Screw of the Top Fan Assembly

  2. Disconnect the cable connector from the top fan assembly.

    Figure 2. Cable Connector of Top Fan

  3. Remove 6 screws that holding the fan to the fan mount base.

    Figure 3. 6 Screws

  4. Remove the fan assembly from the fan mount base.

    Figure 4. Fan Assembly Removal

  5. Attach the new fan assembly to the fan mount base, and tighten the 6 screws.
  6. Connect the cable connector to the fan assembly.
  7. Rotate the top fan assembly to the original position, and tighten the lock screw.

3 Finalization

Procedure

  1. Reinstall top and side covers per cover procedures including gantry power up steps.

    Refer to Parts Replacement > Gantry > Enclosure > (Cover Removal Procedure).

  2. Verify all fans start immediately after a power reset to the gantry. The fans will then either turn off or change to a system defined speed dependent on the current gantry temperature.