Bridge Assembly

Prerequisites

Overview

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 Part within Bridge Assembly).

1 Removing Front Bridge

Procedure

  1. Move the LPCA to the rear end of the rear pedestal and undock the patient table.
  2. Detach the cradle from the LPCA.
  3. System Power must be turned OFF. Refer to HDe 1.5T 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 8 screws.
  9. Raise the flexible cable holder to the rear pedestal side. Refer to illustration.

    Figure 3. Drive Belt Threading through the Rear Pulley

  10. Separate bridge from rear split bridge by removing 4 nuts and 4 washers.

    Figure 4.

  11. Remove the bridge cover by removing two M5 bolts.

    Figure 5. Lower Cosmetic Cover

    12. Notice Image
    • 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.
  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.

2 Replacing Bridge with Part Number 5137313

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. Notice Image
    • 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.
  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

4 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.