• Discovery MR750 3.0T System Service Methods
  • 5690009-2EN Revision 4
  • Object ID: 00000018WIA30D20450GYZ
  • Topic ID: id_2021404 Version: 5.0
  • Date: Feb 21, 2021 9:08:31 PM

Calibrating MNS reflected power and UPM - MNS functional check

Calibrates reflected power for the Multi-Nuclear Spectroscopy (MNS) amplifier.

Procedure

  1. Move the RF Enable S2 switch to the disable (down) position.
  2. (For AMT amplifier) Disconnect the cable from MNS output J4 at the rear of the amplifier and leave J4 open.
  3. (For CPC amplifier) Disconnect the RF output cable:
    • (For the GEN 1 CPC amplifier) (5411744) Open the rear door and disconnect the RF output cable from J3 of the combiner module in the CPC cabinet and leave open.
    • (For the GEN 2 CPC amplifier) (5750811) Open the rear door and disconnect the RF output cable from J2 of the power output in the CPC cabinet and leave open.
  4. Move the RF Enable S2 switch to the Enable (up) position.
  5. Return to the UPM Tool window.
  6. Set Power Monitor to Reflected.
  7. Select Start.
  8. In a few minutes, the tool shows Pass/Fail. If failure occurs, see Troubleshooting UPM failure.
  9. If Pass is shown, do the functional check procedure for the applicable RF output, as follows:
    1. Disable the RF Enable S2 switch by moving it to the DOWN position.
    2. Reconnect the RF dummy load to RF output connector on the back of the MNS amplifier.
    3. Enable the RF Enable S2 switch by moving it to the UP position.
    4. Return to the UPM tool window.
    5. Set Task to UPM Functional Check and click Start to complete the UPM functional check.
  10. If the MNS functional check fails, see UPM - MNS Troubleshooting and Theory.