• Topic ID: id_11039062
  • Version: 3.0
  • Date: May 23, 2022 11:26:05 PM

Vyper DAS Backplane Board (DBP) Replacement

Prerequisites

This procedure defines the replacement process for the Vyper DAS backplane board (DBP).

1 Preparation

Procedure

  1. Move the table cradle to the home position, and position the table to its lowest elevation.
  2. Remove the gantry right side cover.
    3. Notice Image
    • notice
    • Always turn OFF the HVDC before the 120VAC. Turning OFF 120VAC power before HVDC power can result in equipment damage.
  3. Turn OFF Axial Enable, HVDC, and 120VAC switches on the service switch panel.
  4. Remove the gantry side, top and front covers.
  5. Position the DAS at the 12 o'clock position.
  6. Lock the gantry in position using the rotational lock.

2 DAS Backplane Board Removal

Procedure

  1. Release the cable clamps holding the fan controller power cable and signal cable.
  2. Disconnect the cable connectors from the KFC J2 and J3A.

    Figure 1. Release the Cable Clamps and Disconnect Cable Connectors

  3. Demount the Vyper plenum ASM by unscrewing its six M10 head cap screws.

    Figure 2. Vyper Plenum ASM Removal

    • notice
    • Follow ALL Electro-Static Discharge procedures. Always use ESD Wrist Strap and grounding cords. The use of a ground Monitor is suggested
  4. Remove the following boards from the backplane board.
  5. Remove the DAS covers (left, center and right) from the DAS mounting plate assy.

    Figure 3. DAS Covers Removal

  6. Disconnect the following cable connectors from the DAS backplane board.

    • 5423496: KFC Assy J3A to DBP J41

    • 5343002-5: Fuse Board J3 to DBP J51

    • 2333314-3: Collimator J1 to DBP J30

    • 2333309-5: ORP J7 to DBP J31

    • 2377649-2: JEDI Power Unit J5 to DBP J32

    • 5343008: DHCB J2 to DBP J33

    Figure 4. Disconnect Cable Connectors

  7. Demount the DAS frame together with the DAS backplane board from the DAS mounting plate by unscrewing twelve mounting screws.

    Figure 5. DAS Frame and DBP Removal

  8. Remove the DAS backplane board from the DAS frame by unscrewing its twenty-three screws.
  9. Get new DAS backplane board from anti-static bag and secure it to the DAS frame by screwing its twenty-three screws. (Torque: 2.3N-m)
    note:

    Only one screw need to use Loctite242. (See Figure 6)

    Figure 6. Secure DBP Board

  10. Remount the DAS frame together with the DAS backplane board to the DAS mounting plate by securing twelve mounting screws.
    note:

    The flex cables are very sensitive, so keep extreme care when mounting the DAS frame.

  11. Reinstall the DAS covers (left, center and right) to the DAS mounting plate assy.
  12. Reconnect all cable connectors to the DAS backplane board.
  13. Reinstall the DAS interface boards, DAS power board and DAS control board to the DAS backplane board.

    Refer to the following procedure:

  14. Remount the Vyper plenum ASM by securing its six M10 head cap screws with Loctite 242. (Torque: 38.4N-m)
  15. Reconnect the cable connectors to the KFC J2 and J3A and tie cables with cable clamps.
  16. Disengage the rotational lock.
  17. Turn on Axial Enable, HVDC, and 120VAC switches.

3 Finalization

Procedure

  1. Verify proper functionality:
    1. Run at least 10 passes of Scan Data Path Diagnostic.
    2. Take 10 I/Q scans of 20cm phantom.
    3. Verify fault or reason to replace the board now passes.
  2. Reassemble gantry covers.