• Discovery MR750w and SIGNA™ Architect T 3.0T System Service Methods
  • 5690002-2EN Revision 4
  • Object ID: 00000018WIA3020D030GYZ
  • Topic ID: id_12374924 Version: 1.4
  • Date: May 22, 2020 3:59:06 PM

CFB Replacement

Prerequisites

Table 1. Personnel requirements
Required personsPreliminary requirementsProcedureFinalization
1Not Applicable30 minutes30 minutes
Table 2. Tools and test equipment
ItemQuantityEffectivityPart numberManufacturer
Standard Tool Kit1---
Table 3. Replacement parts
ItemQuantityEffectivityPart numberManufacturer
CAN Fiber-Optic Board1-

5167035

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Table 4. Safety
Table 5. Required conditions
ConditionReferenceEffectivity

Follow general lockout and tagout (LOTO) requirements. See the MR Service Safety Manual, PN 5452735.

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Perform LOTO on the RF amplifier and PEN cabinet (magnet room electronics). See the MR Service Safety Manual, PN 5452735.

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About this task

Overview

This procedure details the CAN fiber-optic board (CFB) replacement steps. The CFB is located in the PEN cabinet.

Figure 1. CFB Location in PEN Cabinet
Topic ID: id_SL1948213-1057327

CFB Removal

Procedure

  1. Remove the front cables to the CFB.
    Figure 2. Front of CFB
  2. Note:

    If you need better access to the CFB, unscrew the two thumbscrews on the front of the CFB panel. Carefully slide the shelf forward, taking care with surrounding cords, to perform the CFB replacement.

    Figure 3. CFB Panel Thumbscrews
    Using a ¼ inch wrench, remove the four screws that secure the protective cover.
    Figure 4. Protective Cover Screw Locations
  3. Disconnect the fiber optic lines from connectors J1 through J7.
    Figure 5. CFB Fiber Optic Line Locations
  4. Carefully remove the CFB from the PEN cabinet.
  5. Remove CAN terminator from J16 or J17 and retain for installation on replacement CFB.
Topic ID: id_SL1948218-1057327

Fiber Optic Repeater Board Installation

Procedure

  1. Install secure CAN terminator onto J16 of replacement CFB.
  2. Connect the fiber optic lines from the RF hub, SRI, and PAC boards to the CFB as shown below. The latch on the fiber-optic connector connects facing up.
    Table 6. Fiber Optic Repeater Board Line Connections
    Fiber Optic Repeater Board Connector Line Origin
    J1SRI module, J11
    J2SRI module, J12
    J3RF hub, J14
    J4RF hub, J15
    J5PAC board, J9
    J7PAC board, J10
  3. Connect the cables to the front of the CFB Figure 2.
  4. Install the protective cover Figure 4.
Topic ID: id_15194139

Finalization

Procedure

  1. Remove LOTO from the system and restore all power. See the MR Service Safety Manual, PN 5452735.
  2. Perform CFB Functional Diagnostics.