• Topic ID: id_17479558
  • Version: 1.0
  • Date: Aug 28, 2018 3:54:47 PM

Home Flag Sensor Board Assembly Replacement

Prerequisites

Overview

This procedure defines the necessary steps to replace the home flag sensor board.

1 Preparation

Procedure

  1. Move the table to the home position.
  2. Remove gantry right side cover.

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

  3. Turn OFF the Axial Drive and HVDC switches on the gantry’s Service Switch Panel.
  4. Rotate the gantry to the proper place for easier access to the sensor board.
  5. Turn OFF the 120 VAC switch on the gantry’s Service Switch Panel.
  6. Remove the gantry left side cover, top covers and front cover.

2 Replace Sensor Board or Sensor board assembly

Procedure

  1. Disconnect the harness from the sensor board.
  2. Using a 3 mm hex wrench remove the M4 screws attaching the sensor board to the bracket assembly.

    Figure 1. Home Flag Sensor Board

  3. Replace the sensor board installing the screws previously removed, tightening 1/4 turn past seated.
  4. Reconnect cable to the sensor board.

3 Restore Gantry

Procedure

  1. Slowly rotate gantry by hand and adjust flag position to pass through the center of the opto-sensor on the sensor board. The home flag is next to the 48V Power supply.
  2. Make sure that the flag is centered in the opto-sensor on the sensor board (Figure 2) and does not make contact with it.

    Figure 2. Position of Opto-sensor and Home Flag

  3. If necessary, adjust by loosening the screws and slightly shifting the board.
  4. Perform the Checking the C-Pulse procedure.
  5. Install the gantry front cover, top covers and left side cover.

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

  6. Enable 120 VAC HVDC and Axial Drive service switches from the service switch panel. Press the table drives enable button on the lower right corner of the service switch panel.
  7. Install the gantry right side cover.

4 Finalization

Procedure

  1. Perform a System Scanning Test from the Functional Checks menu of the service manual to ensure system operation.