SIGNA MR355 / SIGNA MR360
Service Manual
5856356-3EN Revision 5.0
Basic Service Documentation. Copyright General Electric Company.
Object ID: 00000018WIA3019AF20GYZ
Topic ID: id_13106105 Version: 1.3
Date: Jul 5, 2019 10:25:11 PM

Rear Pedestal Removal

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
2	Not Applicable	30 minutes	Not Applicable

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
Non ferrous M17 wrench	1	-	-	-
Non ferrous M5 Allen wrench	1	-	-	-
Non ferrous Phillips screwdriver	1	-	-	-
Non ferrous Flathead screwdriver	1	-	-	-

Table 3. Safety

Warning

Personal injury and equipment damage

Strong Magnetic Field

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 in the magnet environment. the path should be as far from the magnet as practical and avoid high flux-density fields.

Safety Requirements

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. Ensure 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.

Warning

Personal injury and equipment damage

Strong Magnetic Field

THIS PROCEDURE REQUIRES Movement OF highly FERROUS MATERIAL IN CLOSE PROXIMITY TO THE MAGNET. Therefore, MULTIPLE Field engineers are required at all times.

CAUTION

PERSONAL INJURY

HEAVY OBJECT - THE REAR PEDESTAL IS VERY HEAVY.

ASSISTANCE TO LIFT THIS PRODUCT [ADDITIONAL PERSONNEL] ARE REQUIRED.

Table 4. Required conditions
Condition	Reference	Effectivity
In case you are going to replace Blower BOX and if the gap between Rear pedestal and Wall is 15.7inch (400mm) or less as Figure 1, it is necessary to remove the Motor Assy first by referring to Interim Assy Replacement. Figure 1. Blower Box location and gap check	-	-

About this task

Removing Front Bridge

Procedure

Move the LPCA to the rear end of the rear pedestal and undock the patient table.
Detach the cradle from the LPCA.
System Power must be turned OFF. Refer to Lockout / Tagout for System Cabinet PDU Main Breaker.
Remove following covers.
- R/L Rear pedestal covers (Refer to Rear Pedestal Cover.)
- R and L rear skirt covers (Refer to Skirt Cover Removal.)
- LPCA cover (Refer to LPCA Cover Removal.)
Disconnect all connectors connecting the magnet and rear pedestal.

Figure 2. Connectors
Release drive belt tension by flipping lever under rear pedestal.

Figure 3. Belt Tension Arm
Remove the belt clamp of front side from LPCA. Refer to illustration. (see Figure 4)
Remove the belt from the pulleys of rear pedestal.

Figure 4. Note the number of Belt Notches beyond the Belt Clamp
Remove the flexible cable holder from the front split bridge by removing 4 screws.
Raise the flexible cable holder to the rear pedestal side. Refer to illustration.

Figure 5. Drive Belt Threading through the Rear Pulley
Remove 4 nuts and 4 washers from back side of rear split bridge.
Remove 2 nuts from R and L fixing brackets of rear pedestal.

Figure 6. Fixing Nuts Removal
Cut the 3 tie-wraps from the rear pedestal front side.

Warning

PERSONAL INJURY

THE DRIVE MOTOR LOCATED IN THE REAR PEDESTAL CONTAINS FERROUS MATERIAL.

MAINTAIN MAXIMUM DISTANCE BETWEEN THE MAGNET AND THE REAR PEDESTAL ASSEMBLY WHILE MOVING THE PEDESTAL ASSEMBLY INTO POSITION.

ALWAYS POSITION THE DRIVE MOTOR AS FAR AWAY FROM THE MAGNET AS POSSIBLE.

MULTIPLE FIELD ENGINEERS ARE REQUIRED AT ALL TIMES.

Using three (2) people, grasp the rear pedestal frame. Slide pedestal away from magnet and, if necessary, out of the magnet room.

Installation is reverse order of removal.

Finalization

Procedure

Verify that the Rear Pedestal is leveled. Refer to Figure 8.

Figure 8. Leveling Of Bridge
Restore power.
Verify that Cradle moves in and out fully and smoothly.
Perform Signal to Noise - Head Scan.