Discovery MR750 3.0T System Service Methods
5690009-2EN Revision 4
Object ID: 00000018WIA30EAF030GYZ
Topic ID: id_12374926 Version: 1.8
Date: Oct 11, 2021 3:47:41 PM

Transient Detection Module (TDM) 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
Non-Magnetic Service Tool Kit	1	-	5112581	-

Table 3. Replacement parts
Item	Quantity	Effectivity	Part number	Manufacturer
Transient Detection Module (TDM)	1	-	Refer to FRU Manual	-

Table 4. Safety

Notice

When removing and or replacing the transient detection module (TDM) on the side of the magnet, ensure that the module is as far away from the magnet as possible when moving it.

Topic ID: id_SL1962441-1060899

Removing TDM

Procedure

Perform LOTO on the PEN cabinet. See the MR Service Safety Manual, PN 5452735.
Remove the magnet side cover to access the TDM. See Side Cover Removal and Installation.

Figure 1. Removing Magnet Side Cover
Disconnect all cables connected to the TDM.

Note:
Remove J1 before you remove J12 in order to prevent damage to the end of the cable connected to J12.

Figure 2. TDM Cable Connections
Remove the four screws holding the TDM to the magnet.

Figure 3. Remove TDM Screws

CAUTION

Strong Magnetic Field!

The module has no ferrous material and is not attracted to the magnet, but eddy currents set up by the strong magnetic field interacting with the TDM can make it very hard for one person to handle.

When removing and or replacing the TDM on the side of the magnet, always keep the module as far away from the magnet as possible while moving it .

While carrying the module out of the magnet room, stay as far away from the magnet as possible.

Topic ID: id_SL1962448-1060899

Installing TDM

Procedure

CAUTION

Strong Magnetic Field!

The module has no ferrous material and is not attracted to the magnet, but eddy currents set up by the strong magnetic field interacting with the TDM can make it very hard for one person to handle.

When removing and or replacing the TDM on the side of the magnet, always keep the module as far away from the magnet as possible while moving it .

While carrying the module into the magnet room, stay as far away from the magnet as possible.

Secure the module to the magnet by tightening the four screws provided.
Attach all cables that were previously removed. See Figure 2.

Note:
To prevent damage to the cables, connect J12 before you connect J1.
Replace the side cover.
Remove LOTO from the PEN cabinet. See the MR Service Safety Manual, PN 5452735.

Topic ID: id_15263096

Finalization

Procedure

Run TNS Datapath Diagnostics to confirm there are no remaining issues.
Run a test scan to make sure the system is functional. See Check Scan.