Optima MR450w BASE 1.5T System Service Methods
5690012-2EN Revision 3
Object ID: 00000018WIA30D8AE20GYZ
Topic ID: id_13105872 Version: 3.5
Date: Feb 6, 2020 1:58:19 PM

Room ambient and bore temperature sensors replacement

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1 person for each sensor replacement procedure	Not Applicable	5 hours for bore temperature sensor; 1 hour for room ambient temperature sensor	15 minutes

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
Digital Volt Meter (DVM)	1	-	-	-
Nonmagnetic Titanium Service Tool Kit, Large Set	1	-	5112581	-

Table 3. Replacement parts
Item	Quantity	Effectivity	Part number	Manufacturer
Bore Temperature Cable and Sensor (Run 3350, MAG-SRI-J10 to Mag-Bore, Bore Temp Sensor)	1	-	See FRU Manual	-
Room Ambient Temperature Sensor	1	-	See FRU Manual	-

Table 4. Required conditions
Condition	Reference	Effectivity
No required conditions.	-	-

About this task

This procedure describes the replacement of the two temperature sensors associated with the magnet. The room ambient temperature sensor is located in the left front cover. The room ambient temperature sensor is clamped into the left cover, so the sensor can be replaced without replacing the cover. The patient bore temperature sensor is located inside the RF body coil. The room ambient temperature cable plugs into the bore temperature cable Figure 1. The bore temperature cable then connects to the SRI at J10.

Figure 1. Room Ambient and Bore Temperature Sensors

Room ambient temperature sensor replacement

Procedure

Apply LOTO on the RF amplifier and PEN cabinet. See the MR Service Safety Manual, PN 5452735.
Remove the side cover and left skirt cover. See Side Cover Removal and Installation and Skirt Cover Removal and Installation.
Remove the front cover. See Front Cover Removal and Installation.
This step links to a different cmodule than the previous step. Remove the front cover. See Front Cover Removal and Installation.
Loosen the set screw holding the room ambient temperature sensor to the front cover, and then remove the sensor.
To install a new room ambient temperature sensor, follow Step 1 through Step 5 (above) in reverse order.

Patient bore temperature sensor replacement

Procedure

Perform LOTO on the RF amplifier and PEN cabinet. See the MR Service Safety Manual, PN 5452735.
Remove the left side cover, left skirt cover, and front cover to access the quick disconnect. See Side Cover Removal and Installation, Skirt Cover Removal and Install and Front Cover Removal and Installation.
Disconnect the bore temperature sensor cable from J10 on the SRI on the left side of the magnet enclosure and pull to the front of the magnet.
Disconnect the room ambient temperature sensor cable. The room ambient temperature sensor cable is approximately 72 inches (180 cm) long and the connector is near the bottom of the left-front cover (see #id_SL1991687-1061576__SL3860280-1061576).
Remove the split bridge Bridge and Longitudinal Drive Belt Replacement.
Remove the front end bell Front End Bell Removal and Install.
Note: As long as the rear end bell is in place and the RF body coil is returned to the bore in the same orientation as it was removed, then RF coil tuning will not be affected. It may be necessary to mark the original body coil position.
Partially remove the RF body coil RF Body Coil Replacement.
Carefully remove the tape located under the sensor. Keep the tape to reused it later.
Pull the sensor from the RF body coil port.
Remove the bore temperature sensor cable by threading it through the magnetic enclosure.
Route the new cable through the magnet enclosure and tape it to the RF body coil at the 315 position. Reconnect the bore temperature sensor cable at J10 on the SRI under the left side of the magnet enclosure, and reconnect the room ambient temperature sensor cable.

Figure 2. Bore temperature sensor cable
Insert the bore temperature sensor into the port in the RF body coil and secure it with tape.

Figure 3. RF body coil port
Replace the RF body coil, front end bell, split bridge, and covers per Step 1 through Step 7 (above) in reverse order. Take care to not pinch the cable.

Finalization

Remove LOTO from the PEN cabinet. See the MR Service Safety Manual, PN 5452735.
Perform a quick head and body scan to ensure that the system is functioning properly.