• Topic ID: id_13107255
  • Version: 4.0
  • Date: Feb 14, 2020 4:12:00 PM

1.5T Head Neck Spine (HNS) Coil Cable Replacement

Prerequisites

Table 1 Personnel requirements
Required persons Preliminary requirements Procedure Finalization
1 Not Applicable 40 minutes Not Applicable
Table 2 Tools and test equipment
Item Quantity Effectivity Part number Manufacturer
Standard tool kit – Flathead screwdriver and pliers 1 - - -
Table 3 Replacement parts
Item Quantity Effectivity Part number Manufacturer
Output Cable-Hypertronics (8-Channel “B” connector) for the Head Neck section with the Coil ID Board 1 HNS Rev. 2 Upgrade with the Coil ID Board

2417356

 -
Output Cable-bendix without the Coil ID Board. 1 HNS Rev. 2 Upgrade without the Coil ID Board

2417357

 -
Output Cable (16-Channel “B” connector) for the Head Neck Section with Coil ID Board. 1 HNS Rev. 2 Forward Production with Coil ID Board

2417359

 -
TL Unit Cable 1 HNS Rev. 2 without the Coil ID Board

2417358

 -
8-CHANNEL HNS EXC III UPGRD SYS CABLE FRU 1 HNS Rev. 3 Upgrade with the Coil ID Board

2423319

 -
8-CHANNEL HNS EXC II SYS CABLE FRU 1 HNS Rev. 3 Upgrade without the coil ID Board

2423317

 -
16-CHANNEL EXC III HNS FWD PRD SYS CBL FRU 1 HNS Rev. 3 Forward Production with Coil ID Board

2423320

 -
HNS TL UNIT CABLE FRU 1 HNS Rev. 3 without the Coil ID Board

2423318

 -
16-Channel P-connector HNS Discovery System Cable FRU 1 HNS P-connector Discovery with Coil ID Board

2424269

 -

Follow this process to change the system cable for coils that have a cable available as a spare part. This process will be the same whether replacing the coil or the cable.

HNS Rev. 2

Procedure

    • notice
    • Please refer to the cable FRU list above in Replacement Parts.
    • If the cable FRU is with the Coil ID Board, then the Coil ID Board has to be removed as well.
    • If the cable FRU is without the Coil ID Board, then do not remove the Coil ID Board.
    • notice
    • Observe anti-static precautions: Use wrist strap and ESD workstation (ESD mat connected to ground and place to connect ESD wrist strap).
  1. Put an ESD wrist strap on and ground.

    Figure 1. ESD Wrist Strap On

  2. Unscrew the bottom cover and remove from coil. Retain the original screws used.
  3. Unscrew the cable clamp from the coil as shown in Figure 2. Retain the original screws used.

    Figure 2. Removing the Cable Clamp

  4. Identify and remove RF connectors (CH in Head Neck Unit (HNU), J in Thoracic Lumbar Unit (TLU)) from interface Board, see Figure 3. Pliers may be necessary for removal of the MMCX connectors, as they may be difficult to unplug. This will help prevent accidental breakage of the cables.

    Figure 3. RF Connectors in the HNU

    Figure 4. Using Pliers for Removal of Connectors

    Figure 5. RF Connectors for the Thoracic Lumbar Unit

  5. Identify and remove DC connectors (DC) from Interface Board and Coil ID PCB. See Figure 6 through Figure 8.

    Figure 6. DC Connectors: Forward Production Coil (1 System Cable) Head Neck Unit (HNU)

    Figure 7. DC Connectors: HNU Illustration (2 System Cables) (Upgrade Specific)

    Figure 8. DC Connections: TLU

  6. Remove the system cable (with or without the coil id).
  7. Refer to the Replacement Parts section, if the cable FRU is with the coil id; remove the coil ID PCB from Interface Board (proceed to the next step). If the cable FRU exists without the Coil ID Board, then remove only the cable.
  8. Identify the Interface Board Assembly and the coil ID PCB located on the Interface Board (Head Neck Unit (HNU) Only). Carefully remove the Coil ID assembly. See Figure 9.

    Figure 9. Interface Board and Coil ID PCB Locations

  9. Install the new system cable.
  10. Align the cable clamp of the cable into the notch of former slot. Screw down cable clamp using original screws. See Figure 2.
  11. If applicable from Step 7: Mount the new coil ID PCB assembly in the open slot on the Interface Board (HNU Only). See Figure 9.
  12. Connect RF connectors to Interface Board. Verify that all labels on the connectors match those on the Interface Board. See Figure 3.
  13. Connect DC connectors to Interface Boards and coil ID PCB (Coil ID PCB for HNU Only). DC connector “S1” connects to J55 on the coil ID PCB. DC connector “S2” connects to J56 on the coil ID PCB. Verify that all labels on the connectors match those on the Interface Board. See Figure 6.
  14. Replace cover. Use original screws to fasten cover.

HNS Rev. 3 HDx, Discovery MR450, and Optima MR450w Systems

Procedure

    • notice
    • Please refer to the cable FRU list above in Replacement Parts.
    • If the cable FRU is with the Coil ID Board, then the Coil ID Board has to be removed as well.
    • If the cable FRU is without the Coil ID Board, then do not remove the Coil ID Board.
    • notice
    • Observe anti-static precautions: Use wrist strap and ESD workstation (ESD mat connected to ground and place to connect ESD wrist strap).
  1. Put an ESD wrist strap on and ground.

    Figure 10. ESD Wrist Strap On

  2. Unscrew the bottom cover and remove from coil. Retain the original screws used.
  3. Unscrew the cable clamp from the coil as shown in Figure 11. Retain the original screws used.
    note:

    When re-installing components, tighten all screws snugly, but do not over-tighten. The recommended torque is 10 in-lbs for M4 screws and 15 in-lbs for M5 screws.

    Figure 11. Removing the Cable Clamp

  4. Identify and remove ganged RF connectors from interface Board. See Figure 12.

    Figure 12. RF Connectors in the HNU

    Figure 13. RF Connectors for the Thoracic Lumbar Unit

  5. Identify and remove DC connectors (DC) from Interface Board and Coil ID PCB. See Figure 14 through Figure 16.

    Figure 14. DC Connectors: Discovery and Forward Production Coil (1 System Cable) HNU

    Figure 15. DC Connectors: HNU Illustration (2 System Cables) (Upgrade Specific)

    Figure 16. DC Connections: TLU

  6. Identify and remove GND connectors from interface board. See Figure 17. Pliers may be necessary for removal of the PCX connectors, as they may be difficult to unplug. This will help prevent accidental breakage of the cables. See Figure 18.

    Figure 17. GND Connectors

    Figure 18. Using Pliers For Removal of Connectors

  7. Unscrew the Kevlar™ termination ring as shown in Figure 19. Retain original screw used.

    Figure 19. Kevlar™ Termination Screw

  8. Remove the system cable (with or without the coil id).
  9. Refer to the Replacement Parts section, if the cable FRU is with the coil id; remove the coil ID PCB from Interface Board (proceed to the next step). If the cable FRU exists without the Coil ID Board, then remove only the cable.
  10. Identify the Interface Board Assembly and the coil ID PCB located on the Interface Board (Head Neck Unit (HNU) Only). Carefully remove the Coil ID assembly. See Figure 20.

    Figure 20. Interface Board and Coil ID PCB Locations

  11. Install the new system cable.
  12. If applicable from Step 4, mount the new coil ID PCB assembly in the open slot on the Interface Board (HNU Only). See Figure 20.
  13. Align the cable clamp of the cable into the notch of former slot. Screw down cable clamp using original screws. (Cable clamp screws are 12 mm in length for the TLU and 10 mm in length for the HNU) See Figure 11.
  14. Connect RF connectors to Interface Board. Verify that all labels on the connectors match those on the Interface Board. See Figure 12.
  15. Connect DC connectors to Interface Boards and coil ID PCB (Coil ID PCB for HNU Only). DC connector “S2” connects J12 located on the 11 channel feedboard to J56 located on the coil ID PCB. DC connector “S1” connects J70 located on the Interface Board to J55 located on the coil ID PCB. Verify that all labels on the connectors match those on the Interface Board. See Figure 14.
  16. Connect GND connectors to the Interface Board. Verify that all labels on the connectors match those on the Interface Board. See Figure 17.
  17. Screw down Kevlar™ termination ring using original screw. (Kevlar™ termination screws are 10mm in length for both the TLU and HNU) See asFigure 19.
  18. For forward production coils, ensure that jumpers (red suitcase) J5, J40, J41, J55, J28, J8, and J39 are removed from cable interface (MUX) board before scanning.
  19. Replace cover. Use original screws to fasten cover.

Finalization

Procedure

  1. Perform a good bye scan with this coil to confirm that the repaired coil operates properly.