• Topic ID: id_12374924
  • Version: 1.3
  • Date: Jul 5, 2019 6:08:29 PM

CFB Replacement

Prerequisites

Table 1 Personnel requirements
Required persons Preliminary requirements Procedure Finalization
1 Not Applicable 30 minutes 30 minutes
Table 2 Tools and test equipment
Item Quantity Effectivity Part number Manufacturer
Standard Tool Kit 1 - - -
Table 3 Replacement parts
Item Quantity Effectivity Part number Manufacturer
CAN Fiber-Optic Board 1 -

5167035

 -
Table 4 Safety
  • danger
  • ELECTROCUTION HAZARD!
  • HIGH VOLTAGE PRESENT
  • USE PROPER LOTO PROCEDURES BEFORE REPLACING THE COMPONENTS. See the “MR Service Safety Manual,” PN 5452735.
Table 5 Required conditions
Condition Reference Effectivity

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

 - -

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

 - -

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

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.

Fiber Optic Repeater Board Installation

Procedure

  1. 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
    J1 SRI module, J11
    J2 SRI module, J12
    J3 RF hub, J14
    J4 RF hub, J15
    J5 PAC board, J9
    J7 PAC board, J10
  2. Connect the cables to the front of the CFB Figure 2.
  3. Install the protective cover Figure 4.

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.