• Topic ID: id_17479166
  • Version: 3.0
  • Date: Jun 10, 2020 2:29:39 AM

Collimator Assembly Replacement

Prerequisites

Overview

Notice Image
  • notice
  • Potential For Equipment Damage. DO NOT lift the Collimator by the Motors.
note: Please check the component P/N when replace the collimator related parts, should be ordered the same P/N according to the label on each component.

Procedure

  1. Move table to its lowest elevation.
  2. Remove gantry covers as required.

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

  3. Position the tube at 3 o’clock.
    • danger
    • Electrocution hazard
    • High Voltages present.
    • Use proper lockout/tagout procedures before replacing components. See safety menu of Service Document gui for appropriate procedures.
  4. Turn OFF all three (3) gantry service switches (Axial Drive Enable, HVDC Enable, 120 VAC). Perform Lockout/Tagout procedures to remove all power from gantry.
    • danger
    • CRUSH HAZARD.
    • UNEXPECTED GANTRY ROTATION CAN CAUSE SERIOUS INJURY.
    • Never service the gantry with the axial drive enabled. Use the gantry rotation lock to lock out gantry rotation. See safety menu of Service Document gui for appropriate procedures.
  5. Engage gantry rotational lock.
    6. Notice Image
    • warning
    • severe injury possible.
    • if the hoist hook's lock nut is loose, then the collimator might drop from the hoist, with the resulting in serious injury to service personnel.
    • before using the hoist, check to make certain that the hook's lock nut is not loose. If it is loose, do not use the hoist. instead, order a new hoist.
  6. Connect and secure hoist and tube change bracket to the tube.
  7. Remove high voltage cables from cathode and anode using spanner wrench.
  8. Remove the tube by following the procedure in Tube Replacement.
    9. Notice Image
    • notice
    • Be careful to keep tube and oil droplets away from contaminating the slipring.
  9. Disconnect connectors J2, J3 and J11 from collimator.
  10. Remove collimator by removing the two (2) mounting bolts from the top, two (2) bolts from the bottom, and 2 bolts from the rear of the collimator.
  11. Install new collimator by replacing the six (6) bolts removed in above step.
    1. Apply Pre-load torque to M14 Mounting bolts:
    2. Apply Final torque to M14 Mounting bolts:
  12. Secure the tube back in place.
  13. Replace high voltage cables back using spanner wrench.
    note: If oil needs to be topped off, be careful of spills. Do not use any part of the gantry as a shelf to rest oil on.
  14. Reassemble gantry.

Finalization

  1. Perform Flash Download.
  2. Perform Gantry Rotation Safety Check.
  3. Perform Gantry Balance Procedure.
  4. Perform Collimator Aperture Test.
  5. Perform Collimator Functional Test.
  6. Perform Plane of Rotation (POR) Alignment.
  7. Perform Beam on Window (BOW) Alignment.
  8. Perform CBF/SAG Alignment Process.
  9. Perform ISO Alignment Procedure.
  10. Perform Hot ISO Alignment.
  11. Perform HHS Scans
  12. Perform Collimator Calibration.
  13. Perform Detailed Calibration.
  14. Perform Fast Calibration.
  15. Perform System Scanning Test.
  16. Perform Quality Assurance Test.
  17. Perform Save System State.