Discovery MR750w and SIGNA™ Architect T 3.0T System Service Methods
5690002-2EN Revision 4
Object ID: 00000018WIA307ED030GYZ
Topic ID: id_12374721 Version: 1.14
Date: Oct 11, 2021 3:47:44 PM

GEM Dock Connector Replacement

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
2	-	90 mins for non–GEM; 110 mins for GEM	15 minutes

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
MCRv tool (3.0T)	1	-	5182417-2	-
Non-magnetic tool kit	1	-	5112581	-

Table 3. Consumables
Item	Quantity	Effectivity	Part number	Manufacturer
Loctite 242 Threadlocker, medium strength	0.5CC	-	-	-

Table 4. Replacement parts
Item	Quantity	Effectivity	Part number	Manufacturer
Self-Locking Cable Tie	5	-	46-208758P3	-
Harness, ODU, GEM, Dock Side P2	1	-	See FRU Manual	-
Harness, ODU, GEM, Dock Side P3	1	-	See FRU Manual	-
Harness, ODU, GEM, Dock Side P4	1	-	See FRU Manual	-

Table 5. Safety

DANGER

Electrocution hazard

High voltage present.

Use proper lockout/tagout procedures before servicing and/or maintaining the dock.

Warning

Possible personal injury

The Dock connector replacement procedure requires movement of ferrous material in close proximity to the magnet.

Therefore two Field Engineers are required at all times.

Warning

Personal injury and equipment damage

If the magnet is energized, tools and loose materials that contain ferrous material will be strongly attracted to the magnet and may become dangerous projectiles.

When servicing any magnetic equipment, it is critically important that the service engineer consciously plan the path to be taken when moving highly ferrous devices within the magnet environment. The path should be as far from the magnet as practical and avoid high flux-density fields.

Movement of ferrous material in the magnet room must follow the GE service procedure for that device.
When exiting, move away from the magnet in the most direct manner possible. Except when moving ferrous material to and from its native location on or near the magnet, the static magnetic field in any portion of the service path shall not exceed 200 Gauss.
Two (2) MR safety trained personnel must be present at all times when servicing highly ferrous devices in the areas of magnetic fields.
When planning a service path, it is critical that the path be clear and sufficiently wide. Make sure that there are no trip hazards, obstacles, clutter, slippery surfaces, or other items even partially restricting the path. If there are portable obstacles in a path, remove them from the area and replace them after the service action is completed. It is required to walk the path prior to beginning service to ensure that there is sufficient space through which to pass for yourself and the object being serviced.

About this task

Overview

The dock contains three connector plates that pass data from the patient table to the RF hub. Signals flow from the table to the system by way of several cables with connecting points. The most important connection takes place where the patient table connects to the magnet via the dock. This document describes replacing the dock side of this connection.

When the patient table and dock are connected, data travels between two types of connectors: coax for RF signal and pin/socket for control.

Topic ID: id_SL3872249-1127246

Removing Dock from Magnet Room

Procedure

Follow the instructions in Dock Removal and Installation to remove the dock from the magnet room.
Proceed to the next section.

Topic ID: id_SL3872250-1127246

Removing Dock Connector Plate

Procedure

When the dock is outside of the magnet room, using a 3/4-inch wrench, remove four bolts (two on each side) to unfasten the dock cover from the dock base.

Figure 1. Side View of Dock

Note:
Be sure to disconnect the dock switch connector when removing dock cover.
Turn the dock cover upside down.

Note:
Be careful that you do not scratch the top of the cover. Lay down a cloth before setting it on the floor.
Remove the two Allen head screws from the ODU P connector being replaced.

Figure 2. Dock Cover Upside-Down View
Cut the cable tie for the ODU P connector harness being replaced.

Figure 3. Dock Cable Ties (Rear View of Dock)
Route the cables through the opening inside the dock cover to remove the dock harness.

Topic ID: id_SL3872251-1127246

Installing Dock Connector Plate

Procedure

Route the replacement dock harness through the opening in the dock cover.
Reattach the ODU P connector to the dock connector plate.

Notice

Cable tie wraps must be located over heatshrink. Make certain that the cables are not taut and verify that the weight of the cables does not load down the connector. There should be a slight loop in the cables inside the housing so that floating hardware can move. The cables should be held secure with the tie wraps so that the cables do not shift during or after installation.

Replace cable ties for the harness on the dock cover.

Carefully turn the dock cover right side up, reconnect the dock switch connector, and place the dock back on the dock base. Reattach the dock bolts. (See Figure 1.)

Topic ID: id_SL3872252-1127246

Installing Dock

Procedure

Follow the instructions in Dock Removal and Installation to install the dock.
Proceed to Finalization.

Topic ID: id_15209401

Finalization

Procedure

Verify proper operation of the table.

Dock the table.
Verify proper up and down table motion.
When the table is in a fully raised position, verify that the table is level with the bridge.
Verify that raising the table to full height results in the LPCA automatically driving out to engage the cradle.
When the table is in a fully raised position, verify that the cradle and the LPCA can be advanced normally into the bore.
Verify that lowering the table results in automatic retraction of the LPCA into the bridge.
Verify normal cradle and LPCA motion from home position to end of travel on the bridge using enclosure In Fast and Out Fast buttons at the Operator Console.
Verify that the emergency release and side latches work properly.