Discovery MR750 3.0T System Service Methods
5690009-2EN Revision 4
Object ID: 00000018WIA3047AE20GYZ
Topic ID: id_13107538 Version: 3.1
Date: Oct 11, 2021 8:47:14 PM

Operator Display and Control Panels Replacement

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1	5 minutes	45 minutes	5 minutes

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

Table 3. Replacement parts
Item	Quantity	Effectivity	Part number	Manufacturer
In-Room Display (option)	1	-	See FRU Manual	-
Trackball Control Panel (option)	1	-	See FRU Manual	-
E-Stop Panel	1	-	See FRU Manual	-
Standard Right Control Panel	1	-	See FRU Manual	-
Standard Left Control Panel	1	-	See FRU Manual	-

Table 4. Safety

Warning

Possible Personal Injury!

This procedure requires removal of ferrous material in close proximity to the magnet.

Keep operator control panel away from front of the magnet bore.

About this task

This document provides the procedures for replacing operator control/display hardware in the front magnet enclosure. This document covers both the in-room display (IRD) version and the version without the IRD.

Topic ID: id_SL1996250-1061152

Replacing In-Room Display

Procedure

Perform LOTO on the PGR PDU/gradient subsystem. See the MR Service Safety Manual, PN 5452735.
Note:
The PDU must be powered down completely to prevent damage to system electronics.

Remove the laser light cover. It is held in place by two screws and a popper.

Figure 1. In-Room Display (IRD)

Figure 2. Removing Laser Light Cover
Remove top panel on back of the IRD by popping tabs with a small flat head screwdriver.

Figure 3. Removing IRD

Warning

Strong magnetic field!

eddy currents can cause resistance when pulling the IRD away from the magnet.

use caution when removing the ird to prevent it from striking the magnet enclosure.

Disconnect the three cables attached to the IRD (ground cable, fiber optic cable, and power cable).

Remove four Allen head screws connecting the bracket plate to the back of the IRD. Lift the monitor up and off the bracket carefully, because eddy currents may pull against it.
Mount the new IRD, reconnect the appropriate cables, and replace the covers.

Topic ID: id_SL1996259-1061152

Replacing Trackball Control Panels and E-Stop Button

Procedure

Perform LOTO on the PGR PDU/gradient subsystem. See the MR Service Safety Manual, PN 5452735.
Note:
The PDU must be powered down completely to prevent damage to system electronics.

Remove the front panels. See Front Cover Removal and Installation.

Figure 4. Removing Front Cover
Disconnect the two cables that connect the control panels to the magnet enclosure.

Note:
If cable connectors are not labeled with a J number, mark the applicable J number on each cable connector before removal.

Figure 5. Removing Control Panel Cables

Warning

Possible Personal Injury!

This procedure requires removal of ferrous material in close proximity to the magnet.

Keep operator control panel away from front of the magnet bore.

Remove the trackball control panel by removing five screws and detaching the emergency stop (e-stop) button cable.

Figure 6. Removing Trackball Control Panel

Note:

If you are only replacing the e-stop button board, disconnect the e-stop cable and remove two screws. Install the new button.

Notice

On the back of the control panel, the e-stop cable connection and the trackball cable connection are of the same size and gender, so they can be accidentally interchanged. Confirm that the cables are connected properly; otherwise, the e-stop circuit will not be resettable. See Figure 6 and Figure 7.

To install the new trackball control panel, follow Step 2 through Step 4 in reverse order.

Topic ID: id_SL1996260-1061152

Replacing Standard Control Panels

Procedure

The three control panels can be removed independently.

Figure 9. Location of Control Panels
Perform LOTO on the PGR PDU/gradient subsystem. See the MR Service Safety Manual, PN 5452735.
Note:
The PDU must be powered down completely to prevent damage to system electronics.

These panels are secured with poppers, but have hidden cables attached to each of them. Pull the control panels away from the cover, being careful not to pull the cables out.

Figure 10. Removing Control Panels
After the panels are free from the enclosure, detach all the cables from each control panel.

Figure 11. Connection Locations
To replace the control panels, reverse the above steps.

Figure 12. EMO Reset on PDU

Topic ID: id_14985891

Finalization

Procedure

Remove LOTO from the PGR/PDU and power on the PDU. See the MR Service Safety Manual, PN 5452735.
Whenever the IRD or trackball control panels are disconnected and then reconnected, a TPS reset must be completed. (This is not necessary if the host computer is rebooted.)
Check the functionality of the item replaced. Run the associated diagnostic, if necessary.
- For the IRD: From the Common Service Desktop, select Diagnostics > Hardware Location > Magnet Room > In Room Display.
- For the control panel: From the Common Service Desktop, select Diagnostics > Hardware Location > Magnet Room > SRI Functional Tests.