• Topic ID: id_11038855
  • Version: 4.0
  • Date: Mar 6, 2020 10:02:03 PM

GTCB Assembly Replacement

Prerequisites

Procedure

  1. Move the cradle to the mechanical OUT limit position by hand.
  2. Raise the Table to its highest position.
    note: If the Table up/down movement is inoperative, use the service power cable to raise the Table (refer to Enforced Table Elevation).
  3. Remove power from Table by turning off 120VAC, Axial Drive and HVDC switches on Service Switch Panel.
  4. Remove the Rear Bottom Cover.
  5. Remove 4 screws, and slide the power driver support toward the Gantry.

    Figure 1. Location of GTCB Assembly

  6. Disconnect all cable connectors from the GTCB assembly.
  7. Remove 8 screws, and remove the GTCB assembly from the power driver support.
  8. Install the new GTCB assembly by referring toStep 7 through Step 6.
  9. Re-connect all cable connectors to the GTCB assembly.

Finalization

  1. Power up the Table from the Service Switch Panel.
  2. Perform the following:
    • Flashdownload (Wait approximately 2 minutes until GTCB firmware start up sequence completion before Flashdownload.)
    • Cradle Characterization Procedures according to Align, Setup, Cals -> Table.
    • Elevation Characterization Procedures according to Align, Setup, Cals -> Table.
    • For Mechanical Characterization, perform following procedures.
      1. Start the Mechanical Characterization tool from the Calibration tab on the Common Service Desktop.
      2. Select the CHARACTERIZE TABLE HEIGHT button from the interface.
      3. Follow the on-screen instructions.
  3. Turn off all 3 switches (Axial Drive, HVDC, 120VAC), and re-install the Table Covers.