• Object ID: 00000018WIA30200130GYZ
  • Topic ID: id_12373927 Version: 1.17
  • Date: Aug 5, 2020 10:12:57 AM

Patient Table Cable Take-up and GEM MUX Box Replacement

Prerequisites

Table 1. Personnel requirements
Required personsPreliminary requirementsProcedureFinalization
1Not Applicable120 minutes for any non-GEM cable track; 120 minutes for P3 ODU to MUX (GEM only); 400 minutes for PA to MUX (GEM only); 220 minutes for P2 or P4 (GEM only)Not Applicable
Table 2. Tools and test equipment
ItemQuantityEffectivityPart numberManufacturer
Phillips screwdriver1---
Flat head screwdriver1---
Standard Allen wrench set1---
Small flat head screwdriver with long shaft1---
Pliers1---
2 x 4 x 10 in (5 x 10 x 25 cm) block of wood (or similar non-ferrous material)2---
Standard wrench set1---
Non-ferrous Phillips screwdriver1---
MCRv Tool Kit (1.5T)1-

5182417

-
Table 3. Consumables
ItemQuantityEffectivityPart numberManufacturer
Loctite 2420.5 cc-

46-170686P1

-
Material handling gloves1 pair---
Table 4. Replacement parts
ItemQuantityEffectivityPart numberManufacturer
1.5T PA MUX Box Assembly with Cable (PA to MUX)1-

See FRU Manual

-
1.5T Touch & Go PA GEM Coil Table Harness (P3 ODU to MUX)1-

See FRU Manual

-
1.5T P2 Table Side Docking Connector with Replacement Track Lids (P2 ODU to P2)1-

See FRU Manual

-
1.5T P4 Table Side Docking Connector with Replacement Track Lids (P4 ODU to P4)1-

See FRU Manual

-
Table 5. Safety

About this task

Overview

The GEM table has P2, P3 (hidden), and P4 port connectors in the table.

This procedure describes the replacement of the patient table cable take-up from:

  • The P-port connection to the table ODU connector

  • The PA coil to the multiplexer (MUX)

  • The MUX to the ODU connector

The new rev tables introduced in 2017 come with an additional line from the P-ports through the cable track assembly, Mux and then to the Dock connector. This additional line is used only on systems that have the MEMS power supply (systems that have DPP receivers).

The Cable Track Assembly FRU will automatically change up to the one that supports the MEMS Table as and when the Legacy part stock goes down.

Note:

The legacy cable track assembly should not be replaced on a table that supports MEMS.

The MUX Box FRU will also change to support the MEMS feature.

It is important to use the correct replacement cable track because the coil ID is contained in the P-port connector.
Figure 1. Table Diagram for Cable Track Replacement

This instruction contains the following procedures:

Replacing P2 or P4 Patient Table Cable Take-Up for GEM Table With or Without MEMS Support

Procedure

  1. Undock the patient table and remove it from the magnet room.
  2. Remove both lower base side covers and fasten the upper bellows in the up position. See Patient Table Upper Bellows and Lower Base Side Cover Removal.
    Figure 2. Patient Table Covers
  3. Lower the table lock safety bar, then lower the table and verify that its weight is resting on the safety bar.
    Figure 3. Table Lock Safety Bar
  4. Remove the bottom front cover, located on the front underside of the patient table, and the right or left table side cover, depending on which cable track is being removed.
    Note:

    When standing at the foot of the patient table facing the magnet, the P2 and P4 cable take-up are on the right side and P3 cable take-up is on the left side.

    Figure 4. Bottom Front Cover
  5. Disconnect the gray TBL P3-J7 or P4-J7 cable from the Touch and Go connector located in the upper left or right corner inside the table top.
    Figure 5. Touch and Go Connector
  6. Remove the release handle cover.
  7. Manually unlock the cradle and move it forward approximately 24 in (61 cm) to clear the guide rails. See Removing and Replacing Cradle Assembly.
    Figure 6. Guide Rail Clearance
  8. Raise the back side of the cradle to gain access to the two screws on each side of the rear section. When the screws are removed, set the cradle down.
  9. Locate the rear of the cradle, remove the two inner screws with a Phillips screwdriver, and lift the plastic cradle cover out.
    Figure 7. Removing Cradle Cover
  10. Remove the three screws on the top of the rear section.
    Figure 8. Screws on Rear Section
  11. Remove the upper screw for each cover mounting block, and rotate them out of the way.
    Figure 9. Mounting Blocks Rotated
  12. Lift off the rear section.
  13. While wearing gloves, remove the left and right strap rails by sliding each one out from the rear of the cradle. Prop up the rear of the cradle to aid removal.
    Figure 10. Table Strap Rails
  14. Slide the cradle top slightly toward the rear of the table to free the cradle top from the front section, and lift the cradle top off the cradle.
  15. Remove the shoulder screw and the four screws securing the two end ribs to the cradle (one near the front and one near the rear section of the cradle.)
    Figure 11. Removing Shoulder Screw
    Figure 12. Removing 2 Screws on End Rib
  16. Remove the six screws from the PA coil or PA filler. Carefully move the filler enough to have clear access to the cotton rod. Be careful not to strain the attached cables while moving the filler.
    Figure 13. Removing Screws on PA Coil or Filler
    Figure 14. Moving the PA Coil or PA Filler
  17. Flex the cotton rod at the middle section of the cradle. Carefully slide it out from the rear section of the cradle.

    Be careful not to break the 2 pins at the end of the cotton rod or lose any of the 4 compression springs.

  18. After the cotton rod is removed from the cradle, restore the PA coil or PA filler to its location in the center section of the cradle.
  19. Unplug all system cables from the PA coil or PA filler. Remove the coil or filler from the cradle.
  20. Remove the remaining end ribs and mid ribs over the P2 cable.
  21. Remove the cotton rod attachment, and rotate the cotton rod out of the way.
    Figure 15. Cotton Rod and Cotton Rod Attachment
  22. Release the cradle.
  23. Move the cradle out from the table far enough to expose the bottom cover (front cable shield) under the P2 connector.
  24. Remove the front cable shield.
  25. Detach the P-port base before disconnecting the P-connector. Make note of the P-port base orientation.
  26. Disconnect the two P-port connectors from the cradle and remove all cable clamps.
    Note:

    Even though only one cable take-up is being replaced, this procedure requires removal of all cables from the cradle because the cradle must be removed from the patient table to access the cable take-up in the track wells.

  27. Use wood blocks or similar non-ferrous material to prop up the rear end of the cradle.
  28. Disconnect the two cable tracks from the bottom of the cradle.
  29. Carefully feed the cables and connectors through the holes located at the rear of the cradle, and remove the cradle from the table.
  30. Mark the existing cable where the cable track begins so that when the replacement cable is placed in the track, the same amount of slack is maintained.
  31. Remove the two slotted brass screws from the cable take-up lead in the cable well.
  32. Pull the rear of the cable take-up, lay it out at the front of the table to expose the cover plate and screws, and remove both screws.
  33. Pull the cable take-up back into the cable well, and unlatch each cable track lid by prying up on the edge with a screwdriver. (Extra cable track lids are included, because these cable track lids are somewhat fragile.)
  34. When all cable track lids are open, feed the cable through the hole and pull the cable being changed below the table.
  35. Open the cable take-up lids on the cable track below the table, and pull the cable being changed out of the cable track.
  36. Remove the four screws on the cable grommet and pull the cables to the side.
    Figure 16. Table Cable Grommet
    Note:

    If changing P2, both cable grommets must be removed.

  37. Cut any cable ties. If replacing the P2 cable, disconnect the table ID cable from the bottom of the PA cable track. (Follow the top cable from the ODU P2 connector to the cable disconnect on the PA side of the table.)
  38. Remove the two ODU P-connector screws, and carefully pull the ODU connector out the back of the table side dock connector.
  39. Measure the distance from the end connector to the cable track of the cable being replaced. Mark the new cable at that location so when the new cable is placed in the cable track, the same amount of slack is maintained.
  40. Replace the cable by following the above steps in reverse order.
    1. Connect the ODU cable.
    2. If replacing the P2 cable, connect the table ID cable.
    3. Install the cable grommet.
    4. Feed the cable through the cradle hole.

      Be sure the cable tie knot end faces the side (not down).

    5. Close the cable take-up lids.
    6. Attach the cover plate.
    7. Attach the P-port connectors and bases.
    8. Attach the front shield.
    9. Attach the end ribs, mid ribs, PA coil, and connectors.
    10. Attach the cotton rods.
    11. Attach the strap rails.
    12. Attach the rear section.
    13. Attach the touch and go connectors.
    14. After performing finalization checks, attach the covers.
    Figure 17. Table Cable Track Wiring
    1When installing these cable ties, ensure that the knot end faces UP.
    2When installing these cable ties, ensure that the knot end faces DOWN.

    Apply the cable ties at the locations indicated in Figure 17.

Replacing GEM Table PA Multiplexer Box Assembly

Procedure

  1. Perform Step 1 through Step 32.
  2. If removing the P3 (PA coil) cable track on the left side, disconnect the cables from the table multiplexer found on the left side of the table.
    Figure 18. Table Multiplexer Located in Front Upper Left Corner
  3. Unmount the multiplexer from the table.
  4. Feed the cable track down through the hole in the table and set the cable track assembly aside.
  5. Reverse the steps above to install the new cable track. See Figure 20 for cable tie locations.
    Figure 19. Final Cradle Cable Routing
    Figure 20. Cable Tie Locations

Replacing GEM Table P3 ODU to PA Multiplexer

Procedure

  1. Undock the patient table and remove it from the magnet room.
  2. Remove the left lower base side cover, and fasten the upper bellows in the up position. See Patient Table Upper Bellows and Lower Base Side Cover Removal.
    Figure 21. Patient Table Covers
  3. Lower the table lock safety bar, then lower the table and verify that its weight is resting on the safety bar.
    Figure 22. Table Lock Safety Bar
  4. Remove the bottom front cover (located on the front underside of the patient table) and the left table side cover. (See Figure 4.)
  5. Disconnect the gray Touch and Go cable from the connector located in the upper left corner inside the table top. (See Figure 5.)
  6. Disconnect the cables attached to the multiplexer. (See Figure 18.)
  7. Remove the screws holding the bottom of the cable track.
    Figure 23. Flat (GEM) Table Cable Track Bottom Section
  8. Remove the screws holding the top of the cable track.
  9. Disconnect the table ID cable, located near the bottom of the cable track. (The table ID cable routes to the ODU P2 connector.)
  10. Remove the four screws on the cable grommet and pull the cables to the side. (See Figure 16.)
  11. Remove the two screws holding the ODU P3 connector to the table dock connector, and carefully slide the cable out the back of the dock connector.
  12. Reverse the steps above to install the new cable track. See Figure 17.
    Note:

    When reinstalling the bottom of the cable track and routing the latch cable, be sure to route the latch cable between cable and hydraulic cylinder. (See Figure 23.)

Finalization

Finalization

  1. Dock the patient table.

  2. Confirm that the cradle release functions properly.

  3. Confirm that the LPCA connects to the cradle and the cradle moves into the bore.