• Topic ID: id_15460858
  • Version: 5.0
  • Date: May 9, 2022 11:45:19 PM

GTCB Replacement

Prerequisites

Overview

This procedure covers replacement for both GTCB and GTCB2. Replacement for GTCB2 is the same as GTCB.

Procedure

  1. Raise the Table to maximum height.
  2. Move the Cradle and IMS to OUT limit position.
  3. Remove power from Table by turning off 120VAC, Axial Drive and HVDC switches on Service Switch Panel.
  4. Remove the Front Base Cover.
  5. Disconnect all cable connector from the GTCB Assy.
  6. Loosen 2 screws, and slide GTCB Assy with the bracket toward the Gantry, then remove it from the Table.
  7. Remove the existing GTCB Assy from the bracket, and attach the new GTCB Assy to the bracket.

    Figure 1. GTCB Assy Removal

  8. Install the new GTCB Assy with bracket in place, and tighten the 2 screws.
  9. Re-connect all cable connectors to the GTCB Assy.

Finalization

  1. Power up the Table from the Service Switch Panel.
  2. Perform the following:

    • Flash download

      note: This note is only applicable for GT2000x. Please ignore the Table Type Mismatch error during Flash download if the actual Table type on the system is “2000X”(GT_LONG_675). After Table Cradle Characterization is completed, this error will be gone.

    • Table Characterization

    • Mechanical Characterization

    • Elevation Inching Adjustment

  3. Turn off all 3 switches (Axial Drive, HVDC, 120VAC), and re-install the Table Covers.