• Topic ID: id_15460360
  • Version: 2.0
  • Date: Nov 8, 2018 1:38:38 AM

Gantry Tilt/Fan Relay (GTFR) Board Replacement

Prerequisites

Overview

Procedure

  1. If possible, Tilt gantry back 20 degrees to aid in this procedure.
  2. Remove gantry right side cover.

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

    3. Notice Image
    • notice
    • Always turn OFF the HVDC before the 120 VAC. Turning OFF 120 VAC power before HVDC power can result in equipment damage.
  3. Turn off the three (3) main power switches (Axial Drive, HVDC, 120VAC) on the Service Switch Panel.
  4. Remove gantry base covers on the left side (TGPU side of gantry)
    5. Notice Image
    • notice
    • Wear a grounded wrist strap when you handle a circuit board.
  5. Remove the nuts that fasten the plastic cover to the GTFR Board.

    Figure 1. GTFR Board

  6. Disconnect the cable connections from the board.
  7. Remove the stand-offs that held the cover to remove the GTFR board.
  8. Install new GTFR board.
    1. Place new GTFR board in the same location as the original.
    2. Install stand-offs and GTFR board cover.
    3. Install cable connections.
  9. Re-install the gantry base covers previously removed.
  10. Restore power to the gantry from the service switch panel (AC Power, HVDC, Axial Drive enable and table drives reset).
  11. Install the gantry right side cover.

Finalization

  1. Perform a Tilt Functional Test by using the Hydraulic Tilt Motor Speed Adjustment procedure.