• Discovery MR750 3.0T System Service Methods
  • 5690009-2EN Revision 4
  • Object ID: 00000018WIA30172E40GYZ
  • Topic ID: id_2019791 Version: 2.2
  • Date: Nov 11, 2020 12:17:49 AM

Checking the response pads

Procedure

  1. In the command prompt, type: screen /dev/ttyCedrusLumina. The BrainWave terminal opens. Use this window to complete BrainWave hardware function checks.
    Note: The Shell window can only be launched when the EA3 user is included in the authorized EA3 group. Users not in this EA3 group will not have access to launch the Shell window. If you are not logged on as the proper logon user, log out and then log back on as the correct EA3 user with the authorized permissions.
  2. Press the response pad buttons in the magnet room while an independent observer in the control room confirms that the R/G/B/Y LEDs on the response interface box respond accordingly.
    Figure 1. Cedrus Lumina 3G response pad LEDs
    Note: Only the Cedrus Lumina 3G is supported. The Cedrus Lumina LP400 should not be plugged into the GOC.
  3. If the LEDs do not respond correctly:
    1. Make sure there is continuity between the response pads and the controller:
      • Check that the response interface box has power.
      • Check that the response fiber optic cable is properly connected at the response interface box and the response pad assembly, as well as at the mating connection.
    2. If the LEDs do not light, check the cabling between the response pads in the magnet room and the controller in the control room.
  4. Press the response pad buttons in the magnet room.
  5. Make sure the following Cedrus box LEDs illuminate and the terminal window shows the corresponding values. This makes sure there is communication from the response pads in the magnet room to the controller box, and then to the host PC. If there is no response on the host PC, check the USB cable between the controller box and the host PC:
    Table 1. Response button functional check
    Response pad button color pressed Cedrus box LED illuminated Character shown on terminal screen
    Blue1a
    Yellow2b
    Green3c
    Red4d