• Topic ID: id_16157893
  • Version: 3.0
  • Date: Nov 27, 2020 2:16:55 AM

PDAS Control Board (DCB) Replacement

Prerequisites

Overview

1 Board Removal

Procedure

    Notice Image
    • notice
    • Follow ALL Electro-Static Discharge procedures. Always use ESD Wrist Strap and grounding cords. The use of a ground Monitor is suggested
  1. Position the table to its lowest position.
  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 top and front covers.
  5. Position the DAS at the 12 o'clock position.
  6. Lock the gantry in position using the rotational lock.
  7. Disconnect all cables on IFB cover. One is Fiber Optic Cable, the other is fan power cable.
  8. Loose the three screws, remove 6 x M6 hex screws from the IFB cover. See Figure 1

    Figure 1. Screws on IFB Cover

    note:

    Do not touch any other screws on the IFB Cover.

  9. Slide the IFB cover.
  10. Put on wrist strap and use ESD precautions.

    Figure 2. DCB Board removal

  11. Slide the DCB out of chassis and place into anti-static bag.

2 Board Installation

Procedure

    • notice
    • Follow ALL Electro-Static Discharge procedures. Always use ESD Wrist Strap and grounding cords. The use of a ground Monitor is suggested
  1. Get new DCB from anti-static bag.
  2. Align DCB edges to board guides in Chassis.
  3. Slide the board into the chassis and push board into place.
  4. Install the IFB cover into place
  5. Secure all the screws. Torque M6 hex screws to 7.9N-m.
  6. Reconnect fiber optic cable and fan power cable.
  7. Disengage the rotational lock.
  8. Turn on Axial Enable, HVDC, and 120VAC switches.

3 Finalization

Procedure

  1. Perform Flashdowload.
  2. Perform Z-Slop
  3. DAS Gain Calibration
  4. FastCal
  5. Verify proper functionality:
    1. Run at least 10 passes of Scan Data Path Diagnostic.
    2. Take 10 I/Q scans of the 48cm phantom.
    3. Verify fault or reason to replace the board now passes.
  6. Reassemble gantry covers.