SIGNA MR355 / SIGNA MR360
Service Manual
5856356-3EN Revision 5.0
Basic Service Documentation. Copyright General Electric Company.
Object ID: 00000018WIA30D9BF20GYZ
Topic ID: id_13107387 Version: 1.1
Date: Jul 6, 2019 12:17:31 AM

Front Bridge Assembly

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
2	Not Applicable	30-75 mins minutes	Not Applicable

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
Non ferrous M17 wrench	1	-	-	-
Non ferrous M5 Allen wrench	1	-	-	-
Non ferrous Phillips screwdriver	1	-	-	-
Non ferrous Flathead screwdriver	1	-	-	-

Table 3. Replacement parts
Item	Quantity	Effectivity	Part number	Manufacturer
Front Split Bridge 5137313	1	systems only replacing the bridge itself. In using this replacement part, you will have to reuse the currently installed front pulley and drive belt. See	-	-
Front Bridge ASM with Pulley and Belt 5147766	1	systems replacing the bridge and its accessories, including pulley and drive belt.	-	-

Table 4. Safety

Warning

FERROUS MATERIAL HAZARD!!

THE PULLEY ASSEMBLY CONTAINS PARTS MADE WITH FERROUS COMPONENTS. HOLDING THIS ASSEMBLY TOO CLOSE TO THE MAGNET BORE WILL FORCIBLY ATTRACT IT TO THE MAGNET.

TO PREVENT POSSIBLE BODILY INJURY, OR DAMAGE TO COMPONENTS, REMOVE THE ASSEMBLY DIRECTLY, NOT MOVING IT IN THE MAGNETIC FIELD MORE THAN IS NECESSARY.

Warning

FERROUS MATERIAL HAZARD!!

THE FRONT BRIDGE SUPPORT ASSEMBLY CONTAINS PARTS MADE WITH FERROUS COMPONENTS. HOLDING THIS ASSEMBLY TOO CLOSE TO THE MAGNET BORE WILL FORCIBLY ATTRACT IT TO THE MAGNET.

TO PREVENT POSSIBLE BODILY INJURY, OR DAMAGE TO COMPONENTS, REMOVE THE ASSEMBLY DIRECTLY, NOT MOVING IT IN THE MAGNETIC FIELD MORE THAN IS NECESSARY.

About this task

Procedure for replacing the patient transport split bridge. Plan on about 30 minutes to remove the bridge. Double the time if you are reinstalling the same bridge components. Plan on at least 75 minutes if you are installing a new bridge that has to have the subcomponents assembled (see Replacing Bridge with Part Number 5137313).

Removing Front Bridge

Procedure

Move the LPCA to rear pedestal with IN button of magnet front panel. Then, Separate LPCA from cradle.
Move the Cradle to the home position and undock the patient table.
System Power must be turned OFF. Refer to System Cabinet PDU Main Breaker LOTO Procedure.
Remove following covers.
- R/L Rear pedestal covers (Refer to Rear Pedestal Cover.)
- LPCA cover (Refer to LPCA Cover Removal.)
Release drive belt tension by flipping lever under rear pedestal.

Figure 1. Belt Tension Arm
Remove the two belt clamps of from LPCA. Refer to illustration. (see Figure 2)
Remove the belt from the pulleys of rear pedestal.

Figure 2. Note the number of Belt Notches beyond the Belt Clamp
Remove the flexible cable holder from the front split bridge by removing 4 screws.
Raise the flexible cable holder to the rear pedestal side. Refer to illustration.

Figure 3. Raise the flexible cable holder
Separate bridge from rear split bridge by removing 4 nuts and 4 washers and removing 2 nuts from R and L fixing brackets.

Figure 4. Separate bridge from rear split bridge
Remove the bridge cover by removing two M5 bolts.Figure 5 shows the procedure for Optima MR360 Configure, for Brivo MR355 configure, uninstall the fixed table first following the procedure in Fixed Table Replacement, and then follow the same procedures shown in Figure 6

Figure 5. Lower Cosmetic Cover

CAUTION

The bridge weight is approx 23kg. The bridge removal needs two people to damage prevention for enclosure bore. When the removing the bridge, care should be taken to ensure the drive belt comes along with the bridge.

Remove the bridge from the magnet bore.

Figure 6. Bridge Bracket Height Adjustor and Spacer

Note:

If you are going to put this bridge back, do not change the location of the Height Adjustment's threaded nylon nuts. If you are replacing this bridge with a new bridge, adjust the lower nuts so the edge of the bridge adjacent to the end bell is 2-4 mm above the flat surface of the end bell.

Slide the bridge out from magnet. Care should be taken to ensure the drive belt comes along with the bridge.

Replacing Bridge with Part Number 5137313

Procedure

Lay bridge on its top and remove the four (4) M5 Allen bolts that attach the Bridge Mounting Bracket.

Figure 8. Bridge Bracket Bolt Locations
Remove belt from bridge.

Figure 9. Pulley with Belt Removed

Warning

FERROUS MATERIAL HAZARD!!

THE PULLEY ASSEMBLY CONTAINS PARTS MADE WITH FERROUS COMPONENTS. HOLDING THIS ASSEMBLY TOO CLOSE TO THE MAGNET BORE WILL FORCIBLY ATTRACT IT TO THE MAGNET.

TO PREVENT POSSIBLE BODILY INJURY, OR DAMAGE TO COMPONENTS, move the bridge out of the magnetic field before continuing.

Flip the bridge so the top is facing up. Using a regular screwdriver, unscrew the two bolts.

Note:

When these bolts are removed, the plate on the opposite side will fall out.

Remove pulley.

Figure 11. Removing Pulley

Bridge Replacement / Installation

Procedure

If necessary, reinstall (or install new) Pulley ASM and Drive Belt on to new Bridge by reversing the steps in Replacing Bridge with Part Number 5137313.
To reinstall the bridge, perform the steps in Removing Front Bridge in reverse order.

Finalization

Procedure

Dock the Table and move the Table to the up limit position. Verify that the Table and Bridge are horizontally aligned and there is no height difference of Table and Bridge at right and left position.
Verify that Cradle moves in and out fully and smoothly.
Perform Signal to Noise - Head Scan.