Discovery MR750w and SIGNA™ Architect T 3.0T System Service Methods
5690002-2EN Revision 4
Object ID: 00000018WIA30D0D030GYZ
Topic ID: id_12374209 Version: 1.7
Date: Jan 17, 2020 10:44:37 AM

Clock Splitter Replacement

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1	Not Applicable	15 minutes	Not Applicable

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
Standard Hand Tools	1	-		-

Table 3. Replacement parts
Item	Quantity	Effectivity	Part number	Manufacturer
Clock Splitter	1	-	See FRU Manual	-

Table 4. Safety

DANGER

FATAL ELECTRIC SHOCK HAZARD!

Fatal voltages exist throughout the cabinet when energized.

TO PREVENT FATAL ELECTRIC SHOCK, DISCONNECT POWER FROM THE PDU BEFORE continuing. PERFORM LOTO procedures PER GE REQUIREMENTS. See the MR Service Safety Manual, PN 5452735.

Notice

Potential component damage

Electrostatic discharge (ESD) can cause permanent damage to electronic components.

Observe the following ESD precautions:

Work on a static-free mat.
Wear a static strap to make sure that any accumulated electrostatic charge is discharged from your body to the ground.
Create a common ground for the equipment being worked on by connecting the static-free mat, static strap, and peripheral units to that piece of equipment.

About this task

Overview

This procedure describes how to replace the clock splitter in the PEN cabinet. The clock splitter exists in RRX receiver systems with ICE or in systems upgraded to ICE.

Topic ID: id_SL16403056-1365986

Removing Clock Splitter

Procedure

Perform LOTO on the RF amplifier and the PEN cabinet. See the MR Service Safety Manual, PN 5452735.
Loosen the thumbscrews from the clock splitter.

Figure 1. Clock Splitter
Disconnect the cables to the clock splitter. Note all the cable locations for reconnection.
Remove the clock splitter from the bracket.

Topic ID: id_SL16403062-1365986

Installing Clock Splitter

Procedure

Install the new clock splitter in the bracket as shown in Figure 1.

Notice

Clock cables on the splitter are Twin BNC connector cables. Align pins and keys before connection after replacement.

Connect the clock splitter cables as marked.

Tighten the thumbscrews to secure the clock splitter to the bracket.

Notice

After LOTO is removed and power is reapplied to PEN cabinet, allow 30 minutes for the exciter to reach operating temperature and stabilize before calibrating or scanning.

Remove LOTO. See the MR Service Safety Manual, PN 5452735.

Topic ID: id_15194395

Finalization

Perform a quick head and body scan to ensure the system is functioning properly.