• SIGNA MR355 / SIGNA MR360
  • Service Manual
  • 5856356-3EN Revision 5.0
  • Basic Service Documentation. Copyright General Electric Company.
  • Object ID: 00000018WIA30377E20GYZ
  • Topic ID: id_13107060 Version: 3.0
  • Date: Aug 29, 2019 1:36:45 AM

Passive Shim (S-V Magnets Only)

Prerequisites

Table 1. Personnel requirements
Required personsPreliminary requirementsProcedureFinalization
1 - - -
Table 2. Tools and test equipment
ItemQuantityEffectivityPart numberManufacturer
· LVshim Phantom Assembly1-

2125245

-
· Nesting Plate Assembly1-

2125247

-
Table 3. Safety

About this task

This procedure applies to S-V magnets only.

Procedure

  1. Perform a 12-plane, 500 Hz, LVshim scan. For TwinSpeed, use GradMode=WHOLE.
  2. After the scan is complete, go to the Service Desktop and open the Service Browser if it's not already running.
  3. Start the LVShim tools as shown in .
    Figure 1. STARTING THE LVSHIM TOOL FROM THE SERVICE BROWSER
  4. TwinSpeed, highlight WHOLE and click on OK.
  5. Continue as follows:

  6. Install passive shims per the LVshim analysis.
  7. Re-enter S/C shim currents from last iteration.
  8. Perform another LVshim scan, analyze the results, and perform another passive shim iteration if analysis does not meet specifications.

Finalization

No finalization steps.