• 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 ensure 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.

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.

Removing Clock Splitter

Procedure

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

    Figure 1. Clock Splitter

  3. Disconnect the cables to the clock splitter. Note all the cable locations for reconnection.
  4. Remove the clock splitter from the bracket.

Installing Clock Splitter

Procedure

  1. Install the new clock splitter in the bracket as shown in Figure 1.
    2. Notice Image
    • notice
    • Clock cables on the splitter are Twin BNC connector cables. Align pins and keys before connection after replacement.

  2. Connect the clock splitter cables as marked.
  3. Tighten the thumbscrews to secure the clock splitter to the bracket.
    4. Notice Image
    • 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.
  4. Remove LOTO. See the MR Service Safety Manual, PN 5452735.

Finalization

Finalization

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