• Topic ID: id_17479582
  • Version: 2.0
  • Date: Nov 19, 2019 11:09:52 PM

Collimator Control Board (CCB) Replacement

Prerequisites

Overview

Refer to Figure 1 for this replacement procedure.

Figure 1. Collimator Control Board (CCB) Replacement

  • warning
  • POTENTIAL FOR SHOCK.
  • VOLTAGE MAY BE PRESENT.
  • USE PROPER LOCKOUT/TAGOUT PROCEDURES BEFORE REPLACING COMPONENTS.
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. Remove gantry power. Ensure that all appropriate Lockout/Tagout procedures are followed.
  2. Remove the gantry side, top and front cover.
  3. Turn OFF all 3 switches (AXIAL DRIVE ENABLE, HVDC ENABLE, 120 VAC) on the Service Switch Panel (SSP).
  4. Position the gantry with the XRT at six-o'clock.
  5. Remove the top cover from the Collimator by removing the five pan head M4 mounting screws that have spring washers.
  6. Disconnect the power cable at connector J12, on the lower side on the Collimator.
  7. Disconnect the two 15 pin D CAN bus connections, J1 and J2, on the upper side of the Collimator.
  8. Remove the four CAN bus connection jackscrews with flat washers & lock washers.
  9. Disconnect the CAM A(J4) & B(J10) encoder cables.
  10. Disconnect all of the remaining cables as shown in the illustration.
  11. Remove the six pan head M4 mounting screws.
  12. Remove the replacement CCB from it's shipping container.
  13. Place the new CCB on the Collimator.
  14. Place the old CCB in the shipping container.
  15. Install the six pan head screws loosely to hold board in place.
  16. Install & tighten the four CAN bus connection jackscrews.
  17. Tighten the six pan head screws.
  18. Re-connect the power cable at connector J12, on the Collimator lower end.
  19. Re-connect the two 15 pin D CAN bus connections, J1 and J2, on the upper side of the Collimator.
  20. Re-connect the CAM A(J4) & B(J10) encoder cables.
  21. Re-connect the remaining cables as shown in the illustration.
  22. Enter replacement procedures software menu.
  23. Enter Collimator.
  24. Access Flash Download Tool and follow the procedure to flash the characterization file onto the CCB.
    note: CCB PWA is static sensitive and is to be loaded with Collimator characterization file specific to frame assembly and linked to the manufacturer’s serial number or GE serial number.
  25. Replace the top cover of the Collimator using the five pan head mounting screws with spring washers and tighten.

Finalization

  1. Perform the following procedures:

    FLASH Download

  2. Collimator Calibration