Optima MR450w BASE 1.5T System Service Methods
5690012-2EN Revision 3
Object ID: 00000018WIA3069AE20GYZ
Topic ID: id_13105835 Version: 3.5
Date: Feb 6, 2020 1:42:26 PM

Front end bell removal and installation

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
2	Not Applicable	1.5 hours	Not Applicable

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
Nonmagnetic Titanium Service Tool Kit, Large Set	-	-	5112581	-

Table 3. Replacement parts
Item	Quantity	Effectivity	Part number	Manufacturer
Front End Bell Assembly	1	-	See FRU Manual	-

Table 4. Safety

DANGER

Strong Magnetic Field!

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

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

Procedure

Perform LOTO on the PDU. See the MR Service Safety Manual, PN 5452735.
Move the patient table away from the magnet. Press the Table Home sensor on the dock, and drive the LPCA toward the rear of the bridge.
Remove the bridge cover.
Remove the bridge assembly. See Bridge and Longitudinal Drive Belt Replacement.

Figure 1. Front end bell
On the 7-segment display (7SD) version, remove the trim ring pieces and front bezel, as follows:
1. Remove the left trim ring to reveal the front bezel screw. The front bezel is held in place by 1 screw and 4 poppers.
2. Remove the front bezel screw and pop off the bezel.
  
  Figure 2. Remove front bezel screw
3. Remove the right trim ring.
On the IRD version, follow these steps:
1. Remove the laser light cover (two screws and a popper).
2. Remove the trim rings.
  
  Figure 3. Remove trim rings
Remove the front body coil bias cable(s) and the body coil ID cable.
Remove the L-brackets from the vibration bracket.

Figure 4. L-Bracket removal
Remove the screws holding the front end bell to the arm brackets.

Figure 5. Front end bell screws
Monitor the slack in the cables as the end bell is removed. The cables should have enough slack to place the end bell on the floor to the left of the front of the magnet.
Notice: The front end bell is heavy. Avoid awkward body positioning. Use proper lifting techniques when moving the front end bell.
Remove the end bell.

Note: Take care when removing or installing the end bell. Do NOT touch or move the body coil. Body coil tuning is dependent on body coil location.
Reverse the steps to install the replacement front end bell. 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. Verify the proper fit of the covers.
If the gap measurement is outside the desired range, see RF Body Coil Replacement.
Guide studs, located in the Service Cable Hardware Kit, may be screwed into the top two M10 bolt sockets to assist placing the replacement front end bell.
Figure 6. Guide Stud

Finalization

Remove LOTO from the PDU. See the MR Service Safety Manual, PN 5452735.
Ensure the microphone and bore lights work.
Complete a body scan (see Doing a check scan).