• Topic ID: id_11039061
  • Version: 3.0
  • Date: May 23, 2022 11:26:05 PM

Vyper DAS Interface Board (DIFB) Replacement

Prerequisites

This procedure defines the replacement process for the Vyper DAS interface board (DIFB).

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 Board Removal/Installation

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 two plates from the relative DIFB by unscrewing its M3 screws.

    Figure 3. Plates Removal

  5. Take off the flex cables from the defective DIFB by using correct way.

    Correct way: Hold the edge of connector and unplug smoothly out, no tilt and shake

    Figure 4. Mothod for Disconnecting Flex Cables from DIFB

  6. Remove fifteen screws from the DIFB.

    Figure 5. Screws Removal

  7. Install two board handle JIGs (6488042, shipped with system shipping collector) onto the DIFB, then pull the DIFB from the DAS backplane (DBP) by holding JIGs.

    Figure 6. JIGs Position

  8. Get new DIFB from anti-static bag.
  9. Let the locating pins through DIFB, then insert pinouts of DIFB to DBP.
  10. Secure all the screws. Torque M4 hex screws to 2.3N-m.
  11. Reconnect the flex cables to the DIFB, then secure the plates to fix them. (Torque: 1.0 N-m)
  12. Remount the Vyper plenum ASM by securing its six M10 head cap screws with Loctite 242. (Torque: 38.4N-m)
  13. Reconnect the cable connectors to the KFC J2 and J3A and tie cables with cable clamps.
  14. Disengage the rotational lock.
  15. 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.