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Magnet Enclosure and Outer Electronics
Replacing the Dual Drive Transmit Receive Switch (DTRSW) and two-channel preamp
Removal and installation instructions for replacing the Dual Drive Transmit Receive Switch (DTRSW) and two-channel preamp in the magnet outer electronics.

Replacements
- Operator Workspace
- ISC (Integrated System Cabinet)
- ICC (Integrated Cooling Cabinet)
- Magnet Enclosure and Outer Electronics
  - Removing and installing the magnet enclosure covers
    Provides removal and installation instruction for all magnet enclosure covers.
  - Replacing the front endbell
    Removes the front endbell and installs a replacement endbell.
  - Replacing the rear endbell
    Removes the rear endbell and installs a replacement rear endbell.
  - Replacing the 1-piece bridge
    Replace the 1-piece bridge assembly.
  - Replacing the Dual Drive Transmit Receive Switch (DTRSW) and two-channel preamp
    Removal and installation instructions for replacing the Dual Drive Transmit Receive Switch (DTRSW) and two-channel preamp in the magnet outer electronics.
    - Electrical Safety
      You must follow all recommended safety procedures when servicing and working near energy sources.
    - Shutting down the host computer
      Shutting down the host computer shuts down the system safely and turns off the power to the host computer.
    - Applying LOTO - ISC
      Apply LOTO to the Power Distribution Unit (PDU) when servicing this item in the Integrated System Cabinet (ISC). Applying LOTO ensures a safe environment when working on this part.
    - Removing the magnet service access trim
      Removes the service access trim. The trim panel covers the screws securing the front and rear service access panels.
    - Removing the magnet front service access panel
      Removes the front service access panel from the magnet to allow access to components mounted on the left-hand side of the magnet.
    - Removing the magnet rear service access panel
      Removes the rear service access panel from the magnet to allow access to components mounted on the left-hand side of the magnet.
    - Removing the Dual Drive Transmit Receive Switch (DTRSW) and two-channel preamp
      Remove the Dual Drive Transmit Receive Switch (DTRSW) and two-channel preamp from the magnet outer electronics.
    - Installing the Dual Drive Transmit Receive Switch (DTRSW) and two-channel preamp
      Install a Dual Drive Transmit Receive Switch (DTRSW) and two-channel preamp in the magnet outer electronics.
    - Installing the magnet rear service access panel
      Installs the rear service access panel onto the magnet enclosure. This panel covers the components mounted on the left-hand side of the magnet.
    - Installing the magnet front service access panel
      Installs the front service access panel onto the magnet enclosure. This panel covers the components mounted on the left-hand side of the magnet.
    - Installing the magnet service access trim
      Installs the service access trim. The trim panel covers the screws securing the front and rear service access panels.
    - Removing LOTO - ISC
      Removing locks and tags, and restoring power to the ISC (Integrated System Cabinet) Power Distribution Unit (PDU).
    - Starting up the host computer
      How to start the host computer.
    - Calibrating transmit/receive dynamic disable
      Calibrates the open circuit fault detection levels of the dynamic disable drivers in the driver module. Do this procedure after system installation, driver module replacement, body coil replacement, body hybrid replacement, or replacement of cabling between any of the previously listed devices.
    - Doing system gain calibration (PX28 or later)
    - Calibrating for quadrature
    - Finalizing the Dual Drive Transmit Receive Switch (DTRSW) and two-channel preamp replacement
      This procedure finalizes the Dual Drive Transmit Receive Switch (DTRSW) and two-channel preamp replacement.
  - Replacing the DS Digitized Per Pin Remote Receiver (DPP RRx)
    Removal and installation instructions for replacing the DS Digitized Per Pin Remote Receiver (DPP RRx) in the magnet outer electronics.
  - Replacing the DS Digitized Per Pin (DPP) Receiver Distributor (Rx Dist)
    Removal and installation instructions for replacing the DS Digitized Per Pin (DPP) Receiver Distributor (Rx Dist) in the magnet outer electronics.
  - Replacing the table interface assembly
    Removal and installation instructions for replacing the table interface (TIF) assembly in the magnet outer electronics.
  - Replacing the Operator Control Panel (OCP) and the In-Room Display (IRD)
  - Replacing the IRD fiber optic cables
    The procedure for replacing the IRD fiber optic USB and DP cables.
  - Replacing the speaker
    Removes the speaker in the rear endbell and installs a replacement speaker.
  - Replacing the laser bracket assembly
    This procedure provides steps to replace the laser bracket assembly.
  - Replacing the bore light
    Removes a bore light from the body coil and installs a replacement bore light.
  - Replacing the RF body coil air flow sensor
    Replace the RF body coil air flow sensor.
  - Replacing the heat exchanger temperature sensor
    Follow this procedure to replace the heat exchanger temperature sensor.
  - Replacing the GE Illuminated Logo
    Removes the illuminated GE logo from the magnet front cover and installs a replacement logo.
  - Replacing the ambient temperature sensor
    Replacing an ambient temperature sensor is a complex process, which includes tasks to fulfill the required conditions as well as tasks for finalizing the installation after replacing the sensor.
  - Replacing the 1-pc bridge trim
  - Body Coil Gap Foam Replacement
  - Body Coil Mount and Base Plate (Front) Replacement
  - Body Coil Mount and Base Plate (Rear) Replacement
- Coil Replacement
- Patient Table
- MDP
- Pen Panel

SIGNA™ Hero 3.0T Service Methods
5852800-8EN Revision 1.0
Object ID: 00000018WIA3048B230GYZ
Topic ID: id_15668210 Version: 1.19
Date: Jul 28, 2021 1:50:41 PM

Replacing the Dual Drive Transmit Receive Switch (DTRSW) and two-channel preamp

Prerequisites

The following tables represent a comprehensive roll-up of the personnel, time, tools, test equipment, and replacement parts you need to complete all possible tasks in this procedure.


Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1	-	30 minutes	30 minutes


Tools and test equipment
Item	Quantity	Part number	Manufacturer
Digital Voltmeter (DVM)	1	46-194427P284	-
Red Warning LOTO Tag	2	46-194427P322	-
Multi-Locking Device (if multiple service personnel are involved)	1	46-194427P313	-
Red LOTO Personal Lock Wrap	2	2393068	-
Brass Master Padlock with Brass Shackle	2	46-194427P320	-
Nonmagnetic Titanium Service Tool Kit, Small Set	1 Kit	5113258	-
Nonmagnetic Titanium Service Tool Kit, Large Set	1 Kit	5112581	-


Replacement parts
Item	Quantity	Part number	Manufacturer
Dual Drive Transmit Receive Switch	1	5384700-2	-
Two-Channel Preamp Assembly	1	5782534	-

Safety

Before working in any GE Healthcare MR suite or performing any GE Healthcare service procedure, you must:

Have read and understood all hazard conditions and safety requirements in the latest revision of the GE Healthcare MR Service Safety Manual (5452735).
Have successfully completed all relevant GE Healthcare Environmental Health and Safety (EHS) courses (or for non-GE employees, equivalent workplace training courses).
Comply with all site-specific training and workplace safety requirements.

If you have any safety concerns at any time, do not begin work or immediately stop work and move to a safe location. Immediately contact your supervisor or site safety officer for instructions on how to proceed.

Warning

Shock hazard

High bias voltages are present at the preamp during normal operation.

Remove power, lock out, and tag out before accessing the preamp.

CAUTION

Strong magnetic field

The Dual Drive Transmit Receive Switch (DTRSW) has no ferrous material and will not be attracted to the magnet, but the eddy currents can cause resistance when you pull the DTRSW away from the magnet.

When removing and replacing the DTRSW, keep the DTRSW as far away from the magnet as possible while moving it.

About this task

This procedure includes the following FRU parts replacement procedures: