• Topic ID: id_17423020
  • Version: 4.0
  • Date: Jan 20, 2020 8:34:20 PM

Gantry Heater Fuse Holder Replacement

Prerequisites

Overview

This procedure defines the necessary steps to Remove and Install the fuse holder of gantry heater.

1 Preparation

Procedure

  1. Move table to home position, fully out and down.
  2. Remove right side gantry cover.

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

  3. 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.
  4. Turn OFF the Axial Drive and HVDC switches on the gantry’s Service Switch Panel.
  5. Position the x-ray tube at 5 o'clock and lock gantry rotation.

    Figure 1. Location of Fuse Holder

  6. Turn OFF the 120 VAC switch on the gantry’s Service Switch Panel.
  7. Remove the gantry left side cover, top covers and front cover.

2 Replacement Procedure

Procedure

  1. Disconnect two cables from the rear of the fuse holder.

    Figure 2. Fuse Holder Removal

  2. Remove the fixing screw and remove the fuse holder form the bracket.
  3. Install the new fuse holder into place, and fix the fuse holder using fixing screw.
  4. Connect the two cables.

3 Gantry Reassembly

Procedure

  1. Make sure the Axial Drive, HVDC and 120 VAC switches on the gantry’s Service Switch Panel are OFF.
  2. Release the gantry rotational lock and install gantry covers, all except the right side cover.

    Refer to Replacement → Gantry → Enclosure → (Cover Removal Procedures).

  3. Turn on the 120 VAC, HVDC and Axial drive service switches.
  4. Rotate the gantry by hands, and confirm no parts hits inside the gantry.
  5. Install gantry right side cover.

4 Finalization

Procedure

  1. Perform a [Quality Assurance Test] from the [Functional Checks] menu of the service manual to ensure system operation.