Discovery MR750 3.0T System Service Methods
5690009-2EN Revision 4
Object ID: 00000018WIA30DED030GYZ
Topic ID: id_12373697 Version: 1.3
Date: Oct 11, 2021 3:47:41 PM

GOC Power Distribution Supply Replacement

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1	Not Applicable	45 minutes	30 minutes

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
Standard and Phillips Screwdrivers and Pliers	1 each	-	-	-

Table 3. Replacement parts
Item	Quantity	Effectivity	Part number	Manufacturer
Global Operating Console PDU	1	-	5262750	-

Table 4. Safety

Warning

Electrocution Hazard!

Hazardous voltages exist in the goc when energized.

before beginning any work, shut down the software if still running. Perform LOTO on the GOC before Continuing. See the “mr Service Safety Manual,” PN 5452735. Because the GOC supports an optional ups, confirm the site’s configuration.

Table 5. Required conditions
Condition	Reference	Effectivity
The host computer and GOCAA must be powered off as described below.	-	-

Topic ID: id_SL659565-1057080

Powering Off Host and GOCAA

Topic ID: id_SL1890300-1057080

Shut Down Software

Procedure

Click the Tools icon.
On the Service Desktop Manager, click System Shutdown.
Confirm the shutdown by clicking OK.
Wait for the system to indicate on the monitor that it is safe to power off the computer before proceeding. It usually takes about 90 seconds for this message to display.

Note:
Watch the screen and wait until the light turns yellow.

Topic ID: id_SL1890305-1057080

Remove Power to Operator Workspace

Procedure

Verify that the power indicator on the Operator Workspace is off.
Host circuit breakers are located on the front of the PDU.

Figure 1. Location of PDU Host/PC Breakers

Move the host circuit breaker down to disconnect power.

Figure 2. Host Breaker

Topic ID: id_SL1890311-1057080

GOC Power Distribution Supply Replacement

Procedure

Shut down system applications. Perform LOTO on the GOC before continuing. See the MR Service Safety Manual, PN 5452735.

Note:
Take extra precaution if the site has installed the optional GOC UPS accessory.
Remove the screws that secure the left and right side panels of the GOC.

Figure 3. GOC Left Panel

Figure 4. GOC Right Panel
Disconnect the ground leads from both side panels.

Figure 5. Left Side Panel Ground Lead

Figure 6. Right Side Panel Ground Lead
Remove both GOC side panels and set aside.
Remove Strain Relief Plate (shown below) from the power cable.

Figure 7. Strain Relief Plate
Disconnect the power cable and connector from the GOC power distribution supply, and remove the retaining screw from the plate.

Figure 8. Power Cable and Connector
Remove two screws from the side of the GOC power distribution supply, and disconnect the AC power cables from the PDU.

Figure 9. Disconnecting AC Cables
Remove the two screws at the top of the plate, and lift the plate up to remove.

Figure 10. Removing Screws and Plate
Carefully slide the GOC power distribution supply out of the GOC.
Insert the replacement GOC power distribution supply. Reverse the preceding steps to properly install the replacement.

Topic ID: id_15210556

Finalization

Procedure

Remove LOTO from the GOC power distribution supply. See the MR Service Safety Manual, PN 5452735.
Turn the host and PC circuit breakers on the PDU back to the On position.
Start the host computer by pressing the On button, and log in.

Note:
It is possible that the customer changed the default password. If you cannot log in, contact the customer for the correct password.
When the system is fully booted, perform a scan to ensure proper operation of the system.