SIGNA MR355 / SIGNA MR360
Service Manual
5856356-3EN Revision 5.0
Basic Service Documentation. Copyright General Electric Company.
Object ID: 00000018WIA30DA1030GYZ
Topic ID: id_13106449 Version: 1.7
Date: Oct 23, 2019 3:02:57 AM

Replacing BRM-D (Short) RF Body Coil

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
2	Not Applicable	3 to 5 hours	Not Applicable

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
Non-Magnetic Tools	1	-	2385097 or 5112581	-
Personal Protection Equipment (PPE) composed of: Gloves Safety Glasses Safety Shoes Long Sleeve Shirts and Pants	1	-	-	-
	1	-	-	-
	1	-	-	-
	1	-	-	-
	1	-	-	-
Authorized Personnel Floor Sign	1	-	2289812	-

Table 3. Replacement parts
Item	Quantity	Effectivity	Part number	Manufacturer
1.5T Short Body RF Coil and Yellow Case	1	1.5T systems	2208999-17	-

Table 4. Safety

DANGER

Strong Magnetic Field!

Ferrous materials can become dangerous projectiles in the presence of the magnetic field Produced by the Signa Magnet.

Do not Bring any ferromagnetic tools or equipment into the magnet room.

CAUTION

Dangerous Work Area!

Use of heavy equipment for coil removal and replacement presents hazards to all personnel in the area.

Set up restricted barriers and signs limiting access to the work area.
Notify all affected personnel in the area prior to starting the service activity. Review safety procedures and restricted areas for the job.

Table 5. Required conditions
Condition	Reference	Effectivity
The following components must be removed prior to RF coil replacement:	Bridge Front Endbell Rear Endbell	-
For steps prior to the actual RF Coil replacement for systems with a Cx or LCC magnet, refer to Failed Gradient Body Coil Removal.	-	-

About this task

The RF body coil cartridge is a Field Replaceable Unit (FRU) that mounts inside the gradient coil (also a FRU). It is available in 1.0T and 1.5T versions. If the RF coil fails, it must be removed from the gradient coil and replaced. Since the replacement procedures for the RF and gradient coils are closely related, references are made below to the epoxy-filled gradient coil replacement procedure where instructions for removal of similar parts (for example, the bridge) can be found. While a portion of the following procedure can be accomplished by one person (connecting/disconnecting various cables, etc.), replacing a failed RF body coil requires more than one person.

Note:

Only trained and qualified engineer can execute this procedure.

Unpacking BRM-D (Short) RF Body Coil

Procedure

A new Cardiac RF body coil is packed in a shipping container (trunk) that is strapped to a pallet. Unstrap the shipping container from the pallet and remove the RF body coil from the trunk. (The process is reversed when preparing the defective RF body coil for return.)
See Figure 1 through Figure 3 to remove the replacement coil.

Figure 1. Tilt RF Coil Case and Roll Off Pallet

Figure 2. Move RF Coil Case to Final Location and Set Case Horizontally

Figure 3. Open RF Coil Case and Remove New Coil

Replacing BRM-D (Short) RF Body Coil

Procedure

Remove the RF Body coil from the CRM without using the RF tracks, which are too thick to use. Use pieces of smooth, stiff material (sheets of film work well) to easily slide the RF coil out of the Gradient Coil. See Figure 4 through Figure 14 for removing and replacing the BRM-D RF Body Coil.

Figure 4. Loosening BRM-D (Short) RF Body Coil Overview

Figure 5. Loosening BRM-D (Short) RF Body Coil Detail

Notice

To prevent possible damage to chip capacitors under the RF Body Coil blanket, keep RF Body Coil straight during removal (avoid excessive up/down or tilting sideways).

Further caution must be taken for a CX magnet with an old BRM mounting that has Al plates (2213168, 2213167) with gussets. These gussets extend 10 mm into the RF tube pass, and may damage the coil. If necessary, replace the old Al brackets with the new brackets (2213168-3, 2213167-3) without a gusset. (See Gradient Coil Replacement Preparation.)

Figure 9. Removing BRM-D (Short) RF Body Coil

Figure 10. Installing BRM-D (Short) RF Body Coil

Figure 11. Installing the BRM-D (Short ) RF Body Coil

Figure 12. Positioning the BRM-D RF Body Coil

Figure 13. Installing the RF Constraints (Additional Detail)

Figure 14. Securing BRM-D (Short) RF Body Coil

Complete remaining installation steps per Gradient Coil Installation Procedure.
Return the failed RF coil to the shipping crate, reversing the steps used to remove the replacement coil in Unpacking BRM-D (Short) RF Body Coil.
Route RF cable along left side of the plate, securing in position using cable mounts (PN 46-208747P1) and cable ties (PN 46-252283P68) on front support plate.

Figure 15. Route RF cable
Connect the RF cable J3/J4 which is coming up from body coil to cable 2018/2019( D-D bias cable) which is coming up from under the magnet.

Figure 16. RF cable Connection

Note:
Do not have a loop or slack when connecting the D-D bias cable to the body coil cable.

Finalization

Procedure

Install all removed components.
Clean up the site in preparation for patient scans.
Perform TR Dynamic Disable Calibration.