• Discovery MR750w and SIGNA™ Architect T 3.0T System Service Methods
  • 5690002-2EN Revision 4
  • Object ID: 00000018WIA30EC4E20GYZ
  • Topic ID: id_13106424 Version: 3.6
  • Date: Nov 12, 2020 3:48:46 PM

RF body coil replacement

Prerequisites

Table 1. Personnel requirements
Required personsPreliminary requirementsProcedureFinalization
3Not Applicable4 hours -
Table 2. Tools and test equipment
ItemQuantityEffectivityPart numberManufacturer
Safety Glasses1---
Cut-Resistant Gloves1---
Safety Shoes1---
Small Carpenter Level1---
Authorized Personnel Floor Sign1-

2289812

-
Nonmagnetic Titanium Service Tool Kit, Large Set1-5112581-
Step Gauge (stored at front mounting bracket of magnet)1-

5397937

-
Table 3. Consumables
ItemQuantityEffectivityPart numberManufacturer
Adhesive1-

46-220312P1

-
Anti-seize1-

2119594

-
Table 4. Replacement parts
ItemQuantityEffectivityPart numberManufacturer
Discovery MR750w 3.0T Body Coil and FRU Case (includes dielectric materials used during replacement)1-

See FRU Manual

-
Table 5. Safety

About this task

Use this procedure to replace the RF body coil.

Procedure

  1. Locate HART log information as shown in items ① and ② below. In item ③ select View Current Status, find the BoardRevision column, scroll down and find 3T BODYCOIL, and on the same row and fourth column from left, record HART ID value of 8 or 16.
    Figure 1. HART ID information
    HART ID value (8 or 16)
  2. Perform LOTO on the PGR cabinet. See the MR Service Safety Manual, PN 5452735.
  3. Outside the magnet room, open the FRU box and unpack the FRU body coil.
    Figure 2. FRU body coil unpacking
  4. Check the configuration of dielectric material for the FRU body coil.
    Figure 3. Dielectric material for FRU body coil
    Table 6. Record dielectric material configuration (FRU body coil)
    Configuration of dielectric material (FRU body coil)
  5. Remove the bridge cover.
    Figure 4. Bridge cover.
  6. Remove the split bridge. See Bridge and Longitudinal Drive Belt Replacement.
  7. Remove the front end bell. See Front End Bell Removal and Install.
  8. Disconnect the two air hoses at the rear end of the body coil.
  9. Disconnect the two RF transmit cables (channels 1 and 2) and the HART ID cable at the rear end of the body coil.
  10. Remove the rear end bell. See Rear End Bell Removal and Install.
  11. Remove the yellow foam seals between the acoustical barriers and body coil.
    Figure 5. Remove yellow foam
  12. Remove the bolts fixing the RF body coil as follows:
    1. For the front side, remove four M6 bolts and washers from the base of the RF coil centering assembly.
    2. For the rear side, remove four M6 bolts and washers from the bottom of the RF body coil.
    Figure 6. Remove bolts and nuts
  13. Disconnect the bore temperature sensor and tape it to the magnet enclosure so it is out of the way.
    Figure 7. Disconnect bore temperature sensor
  14. Slightly pull out the body coil.
    Figure 8. Remove body coil, part 1
  15. Remove the RF coil centering assemblies.
    Note: The RF coil centering assemblies are reused for the new RF body coil. Do not discard.
    Figure 9. Remove body coil, part 2
  16. Fully remove the coil and place it inside the empty bottom half of the FRU case.
    Figure 10. Remove body coil, part 3
  17. Check the configuration of dielectric material for the defective body coil.
    Figure 11. Dielectric material for defective body coil
    Table 7. Record dielectric material configuration (defective body coil)
    Configuration of dielectric material (defective body coil)
  18. Open the following Data Analysis Tool (PDF) and follow the instructions in the tool to set up dielectric material for the FRU body coil.
    Note:
    • Adobe Acrobat Reader 9 or higher is required. Contact IT Help Desk if needed.
    • Open the PDF and click on the screen once to activate the tool.

    Data analysis tool

    Note: Dielectric materials are stored in the FRU box. If additional dielectric material is needed, the Dielectric Tuning FRU Kit is PN 5423650.
  19. Transfer the front RF coil centering assemblies (front) which were used for the defective RF body coil to the new RF body coil.
    Figure 12. Transfer front RF coil centering assemblies
  20. Inspect the airflow gaskets (5404530 and 5404530-2). Gaskets must be securely bonded along the entire length.
    Notice: Before each body coil installation, inspect the airflow gaskets (5404530 and 5404530-2). Gaskets must be securely bonded along the entire length.
    Figure 13. Airflow Gaskets
  21. Slide in the new RF body coil.
    Figure 14. Slide in RF body coil
  22. Attach the RF body coil using bolts and washers in reverse order of removal.
    Figure 15. Restore RF Body Coil
  23. Note the revision number of the Replacement RF coil.
    1. If revision number is 5 or greater, confirm part numbers of cables between RF body coil and DTRSW are 5746690 and 5746690-2. If the existing cables have part numbers different from these, locate new RF cables included with the body coil FRU and install between body coil and DTRSW.
    2. If the revision number of the Replacement RF coil is 4 or lower, use existing cables and do not replace with those included with body coil FRU.
  24. Notice: Do not skip the RF body coil isolation procedure. It has a great influence on body coil tuning.
    Perform RF Body Coil Isolation.
  25. Reconnect the bore temperature sensor to the coil.
    Figure 16. Bore temperature sensor
  26. Install the yellow foam as previously installed (front: 2/3 of the diameter with the top 1/3 open; rear: full diameter around body coil).
    Figure 17. Yellow foam
  27. Replace the front end bell. See Front End Bell Removal and Installation. Confirm the gap between the front end bell and the RF body coil is 2.5 +/- 0.5 mm with a desired gap of 2.0 mm.
  28. Replace the rear end bell. See Rear End Bell Removal and Installation. Confirm the gap between the rear end bell and the RF body coil is 2.5 +/- 0.5 mm with a desired gap of 2.0 mm.
  29. Reconnect the two air hoses at the rear end of the body coil.
  30. Reconnect the two RF transmit cables and the HART ID cable to the RF body coil.
  31. Replace the split bridge. See Bridge and Longitudinal Drive Belt Replacement.

Finalization

Note: Required calibrations and functional checks after body coil replacement are done in the RF body coil tuning procedure, below.
  1. Remove LOTO. See the MR Service Safety Manual, PN 5452735.
  2. Perform a TPS reset.
  3. Perform RF Body Coil Tuning.
  4. Return the defective body coil in the FRU box.

    Return RF cables in the FRU box.

    Return unused dielectric materials in the FRU box with the defective RF body coil.