Topic ID: id_12374929
Version: 1.6
Date: Jul 5, 2019 10:24:08 PM

RF Hub Boards and Chassis Replacement

Prerequisites

Table 1 Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1-2	Not Applicable	60-120 minutes	Not Applicable

Table 2 Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
Non-Magnetic Service Tool Kit	1	-	5112581	-

Table 3 Replacement parts
Item	Quantity	Effectivity	Part number	Manufacturer
RF Switch Board (RFSB, RFSB2, or RFSBv)	1–2	-	See FRU Manual	-
MC Driver Board (MCDB)	1–2	-	See FRU Manual	-
RF Control Board (RFCB)	1	-	See FRU Manual	-
Power Distribution Board (PDB or ePDB)	1	-	See FRU Manual	-
RF Hub Chassis	1	-	See FRU Manual	-

Table 4 Safety

caution

Projectile hazard!
The power distribution board (PDB) contains some ferrous material and can be attracted to the magnet.
Do not place the PDB on top of the rear pedestal or less than 2 feet from the magnet. Use caution when removing boards.

Table 5 Required conditions
Condition	Reference	Effectivity
Perform LOTO on the PDU. See the MR Service Safety Manual, PN 5452735.	-	-

Overview

note:

When returning RF hub boards, use the original FRU packaging.

This document includes replacement procedures for:

RF switch board (RFSB) RF Switch Board
Multicoil driver board (MCDB) MC Driver Board
RF control board (RFCB) RF Control Board
Power distribution board (PDB) Power Distribution Board
RF hub chassis RF Hub Chassis

RF Switch Board

Multiple versions of the RF boards have been used, but the location in the RF hub chassis and the replacement procedures are the same.

Removing RF Switch Board

Procedure

notice

The scan room power supply (SRPS) must be powered OFF before removing the power distribution board.

Remove the side covers from the rear pedestal.
Turn off the power switch on the power distribution board. See Figure 1.
Remove the cables on the front of the RF switch board.
Loosen the top and bottom screws on front of the RF switch board.
Lift up on the top and bottom release levers to eject the RF switch board.

note:
The board will not eject unless both screws are thoroughly loosened.
Slide out the RF switch board from the RF chassis.
Place the board in an ESD bag and remove it from the magnet room.

Installing RF Switch Board

Procedure

Slide the new RF switch board into the RF chassis. Make sure the board is in the track.
Line up the mechanical lever groove with the chassis edge, and lower the levers to insert the board.

Figure 3. Groove on RF Board Lever

note:
Make sure the board is fully seated in the RF chassis.
Tighten the top and bottom screws to secure the RF switch board to the RF chassis.
Attach cables to the front of the RF switch board.

MC Driver Board

Removing MC Driver Board

Procedure

Remove the side covers from the rear pedestal.
Turn off the power switch on the power distribution board. See Figure 1.
Loosen the top and bottom screws on the front of the MC driver board.
Lift up on the top and bottom release levers to eject the MC driver board.

note:
The board will not eject unless both screws are thoroughly loosened.
Slide out the MC driver board from the RF chassis.
Place the board in an ESD bag and remove it from the magnet room.

Installing MC Driver Board

Procedure

Slide the new MC driver board into the RF chassis.
Line up the mechanical lever groove with the chassis edge, and lower the levers to insert the board. See Figure 3.

note:
Make sure the board is fully seated in the RF chassis.
Tighten the top and bottom screws to secure the MC driver board to the RF chassis.

RF Control Board

Removing RF Control Board

Procedure

Remove the side covers from the rear pedestal.
Turn off the power switch on the power distribution board. See Figure 1.
Remove the cables on the front of the RF control board.
Loosen the top and bottom screws on the front of the RF control board.
Lift up on the top and bottom release levers to eject the RF control board.

note:
The board will not eject unless both screws are thoroughly loosened.
Slide out the RF control board from the RF chassis.
Place the board in an ESD bag and remove it from the magnet room.

Installing RF Control Board

Procedure

Slide the new RF control board into the RF chassis.
Line up the mechanical lever groove with the chassis edge, and lower the levers to insert the board. See Figure 3.

note:
Make sure the board is fully seated in the RF chassis.
Tighten the top and bottom screws to secure the RF control board.
Attach the cables to the front of the RF control board.

Power Distribution Board

Removing Power Distribution Board (PDB or ePDB)

Procedure

Remove the side covers from the rear pedestal.
Turn off the power switch on the PDB. See Figure 1.
Turn off the power switch on the scan room power supply (SRPS).
Remove the cables on the front of the PDB.
Loosen the top and bottom screws on the front of the PDB.
Lift up on the top and bottom release levers to eject the PDB.
Slide out the PDB from the RF chassis.

note:
The board will not eject unless both screws are thoroughly loosened.
For a PDB, remove the terminator (shunt connector) on slot J3. The ePDB does not have a terminator.

note:
Use this terminator (shunt connector) again when installing the new PDB.
Place the board in an ESD bag and remove it from the magnet room.

Installing PDB

Procedure

Slide the new PDB into the RF chassis.
Line up the mechanical lever groove with the chassis edge, and lower the levers to insert the board. See Figure 3.

note:
Make sure the board is fully seated in the RF chassis.
Tighten the top and bottom screws to secure the PDB to the RF chassis.
Attach the cables to the front of the PDB.
For a PDB, attach the previously used terminator on slot J3. The ePDB does not have a terminator.
Turn on the SRPS.

RF Hub Chassis

Removing RF Hub Chassis

Procedure

Remove the following RF hub boards:
- RF switch board(s). See Removing RF Switch Board.
- MC driver board(s). See Removing MC Driver Board.
- RF control board. See Removing RF Control Board.
- Power distribution board (PDB or ePDB). See Removing Power Distribution Board (PDB or ePDB).
Remove any cables connected to the back of the RF chassis.
On the other side of the rear pedestal, locate the vent intake connected to the RF chassis.
Remove the three screws directly on top of the vent intake.

Figure 4. Vent Intake Screw Locations
Pull the vent intake away from the RF chassis.
Remove the seven bolts securing the RF chassis to the rear pedestal.

Figure 5. RF Chassis - Bolt Locations
Remove the RF chassis from the rear pedestal.

Installing RF Hub Chassis

Procedure

Position the new RF chassis in the rear pedestal.
To connect the venting intake to the RF chassis, seat the vent in the RF chassis lip and secure the three screws directly on top of the vent intake. See Figure 4.
Attach any previously installed cables to back of the RF chassis.
Secure the seven bolts attaching the RF chassis to the rear pedestal. See Figure 5.
Install the following RF hub boards:
- RF switch board(s). See Installing RF Switch Board.
- MC driver board(s). See Installing MC Driver Board.
- RF control board. See Installing RF Control Board.
- Power distribution board (PDB or ePDB). See Installing PDB.

Finalization

Procedure

Turn on the power switch on the PDB.
Replace the side covers on the rear pedestal.
Remove LOTO. See the MR Service Safety Manual, PN 5452735.
Perform a TPS reset.