• Topic ID: id_16157854
  • Version: 2.0
  • Date: Nov 27, 2020 2:16:26 AM

GDAS 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. Put on wrist strap and use ESD precautions.
  8. Remove the right DAS chassis cover (see Figure 1):
    1. Disconnect the fiber-optic cable from the Transmit (TX) port.
    2. Loosen the six (6) captive screws that hold the cover in place.

    Figure 1. Right DAS Chassis

  9. Eject the DCB, using the red ejector tabs. See Figure 2.

    Figure 2. Use Ejector Tabs to Remove DCB from Chassis

  10. Slide 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. Remove New DAS Control Board from Anti-Static Bag.

    Figure 3. DAS Control Board

  2. Verify proper jumper configuration:
    1. JP2; no jumpers for normal operation.
    2. (For GDAS-16 only) JP3; no jumpers for normal operation.
    3. (For GDAS-16 only) JP4; no jumpers for normal operation.
  3. Insert new board into chassis:
    1. Align DCB edges to card guides in Chassis.
    2. Slide the board into the chassis until Red ejector tabs align with the card guides (see Figure 4).
    3. Fold the Red tabs over to push board into place.
    4. Press again with more strength to put into inner end of the chassis.

    Figure 4. Position Card So That Ejector Tabs Fit Into Channel

  4. Turn the Gantry 120VAC power ON (Service Switch Board), and verify DCB Power LED is illuminated.
  5. Turn on the Axial and HVDC switches, on the Service Switch Board.
  6. Disengage rotational lock.
  7. If applications software is up, perform a DAS Reset from the Reset Menu.
    note:

    It may be necessary to FLASH the new DCB Flash Download Tool (GOC3 Console).

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 the 48cm phantom.
    3. Verify fault or reason to replace the board now passes.
  2. Reassemble gantry covers.