• Discovery MR750 3.0T System Service Methods
  • 5690009-2EN Revision 4
  • Object ID: 00000018WIA30230450GYZ
  • Topic ID: id_2021405 Version: 4.0
  • Date: Feb 21, 2021 9:08:28 PM

Troubleshooting UPM failure

Troubleshoots failure of the Universal Power Monitor (UPM).

Procedure

  1. Ensure proper setup of the calibration equipment.
  2. Check the cabling between the UPM and the amplifier.
  3. Check mgd_stage file: cd /w/config. Remove the “p” if necessary (p=UPM emulated).
    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.
  4. (For AMT amplifier) Refer to Re-enabling VSWR fault detection in AMT amplifier and perform steps to safely reconnect J7 and J8 cables to the controller module PCB.
  5. Do the maximum RF power calibration procedure. Repeat the UPM calibration.
  6. Check the UPM for power.
  7. Check the error log for details of the UPM failure.
  8. Do body UPM calibration. If it fails, check the error log.
  9. If detector boards are replaced, do the UPM calibration to put the new boards into service.