• SIGNA MR355 / SIGNA MR360
  • Service Manual
  • 5856356-3EN Revision 5.0
  • Basic Service Documentation. Copyright General Electric Company.
  • Object ID: 00000018WIA30FBBF20GYZ
  • Topic ID: id_13106568 Version: 1.2
  • Date: Jul 6, 2019 12:17:31 AM

Front Bridge Assembly

Prerequisites

Table 1. Personnel requirements
Required personsPreliminary requirementsProcedureFinalization
2Not Applicable30-75 mins minutesNot Applicable
Table 2. Tools and test equipment
ItemQuantityEffectivityPart numberManufacturer
Non ferrous M17 wrench1---
Non ferrous M5 Allen wrench1---
Non ferrous Phillips screwdriver1---
Non ferrous Flathead screwdriver1---
Table 3. Replacement parts
ItemQuantityEffectivityPart numberManufacturer
Front Split Bridge 5333192 1systems 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 53331811systems replacing the bridge and its accessories, including pulley and drive belt.--
Table 4. Safety

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 5555192).

Removing Front Bridge

Procedure

  1. Move the LPCA to rear pedestal with IN button of magnet front panel. Then, Separate LPCA from cradle.
  2. Move the Cradle to the home position and undock the patient table.
  3. System Power must be turned OFF. Refer to System Cabinet PDU Main Breaker LOTO Procedure.
  4. Remove following covers.
  5. Release drive belt tension by flipping lever under rear pedestal.
    Figure 1. Belt Tension Arm
  6. Remove the two belt clamps of from LPCA. Refer to illustration. (see Figure 2)
  7. Remove the belt from the pulleys of rear pedestal.
    Figure 2. Note the number of Belt Notches beyond the Belt Clamp
  8. Remove the flexible cable holder from the front split bridge by removing 4 screws.
  9. Raise the flexible cable holder to the rear pedestal side. Refer to illustration.
    Figure 3. Raise the flexible cable holder
  10. 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
  11. Remove the bridge cover by removing two M5 bolts.Figure 5 shows the procedure for SIGNA MR360 Configure, for SIGNA 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
  12. 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.

    Figure 7.
  13. 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 5555192

Procedure

  1. 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
  2. Remove belt from bridge.
    Figure 9. Pulley with Belt Removed
  3. Flip the bridge so the top is facing up. Using a regular screwdriver, unscrew the two bolts.
    Figure 10. Screw Location
    Note:

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

  4. Remove pulley.
    Figure 11. Removing Pulley

Finalization

Procedure

  1. 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.
  2. Verify that Cradle moves in and out fully and smoothly.
  3. Perform Signal to Noise - Head Scan.