• Topic ID: id_23554167
  • Version: 2.0
  • Date: Feb 4, 2020 1:40:36 AM

Gantry Top Covers & Fan Removal (Limited Access)

Prerequisites

Overview

The LightSpeed 5.X (Pro 16, RT and RT16) and 7.X products Gantry Top Cover consists of a Right and Left Top Cover, and two fan assemblies. The Top Covers fasten to the front and rear covers, and the fan assembly fastens to the corresponding Top Cover. SeeFigure 1 for a sample configuration.

Figure 1. Sample Top Cover Locations (actual configuration may be different)

Procedure

    Notice Image
    • caution
    • Possible muscle strains and injury.
    • Top Covers with fans are heavy.
    • To prevent muscle strains and injury, always install the Top covers and fan assemblies separately, to reduce the overall weight. If the fan assemblies are currently attached to the Top Covers, remove them before attempting to lift the Top Cover into place.
    Notice Image
    • caution
    • Personal injury or damage to the system.
    • Not turning off the three (3) power switches.
    • Always remove the right side cover first, and turn off the three (3) power switches before removing the top cover.
    Notice Image
    • caution
    • Shock hazard
    • Voltage Present
    • No Service on the TGPU side while energized.
    Notice Image
    • notice
    • Only trained service personnel should service the GE CT Scanner.
  1. Turn OFF the three (3) main power switches (HVDC, 120VAC, and Axial Drive) on the Service Switch Panel (SSP). See Figure 2.

    Figure 2. Service Switch Panel

  2. Remove the Top Cover Fan Assemblies as follows:
    1. Fan Assembly Handles (2364311) can be found at Shipping Collector
    2. Reach beneath the Right Top Cover and unscrew the captive thumbscrews that fasten the Fan Assembly to the Top Cover.
    3. Fasten the Fan Assembly Tools into the threaded holes in the cover. See Figure 3.

      Figure 3. Preparing to Remove the Gantry Fan Assembly

    4. On the Right Top Cover, disconnect the two fan assembly cables and the Rear Cover cable.
    5. Remove the Fan Assembly. See Figure 4.

    Figure 4. Remove Gantry Fan Assembly

  3. Lift the end of the Right Top Cover nearest to the side cover then tilt upwards and slide the cover down about 75 millimeters, to disengage the cover tab from the mounting bracket. RT System are wider than the rest of the 5.x systems. Due to this, there is an extra top center “spacer” cover. See Figure 5

    Figure 5. Top Cover Tabs

  4. Lift the cover to clear the bracket and Gantry assemblies.
  5. Repeat Step 1 through 4 to remove Left Top Cover.

Finalization

  1. Verify all covers, especially side covers are properly secured.

  2. Ensure there is no interference during all tilt range