A Port Coil Connector Replacement

Prerequisites

Table 4. Safety

STRONG MAGNETIC FIELD!
FERROUS MATERIALS CAN BECOME DANGEROUS PROJECTILES IN THE PRESENCE OF THE MAGNETIC FIELD PRODUCED BY THE SIGNA MAGNET.
Do not Bring any ferromagnetic tools or equipment into the magnet room.

Table 5. Required conditions
Condition	Reference	Effectivity
Move the LPCA to rear pedestal with IN button of magnet front panel. Then, Separate LPCA from cradle.	-	-
System Power must be turned OFF. Refer to Lockout / Tagout for System Cabinet PDU Main Breaker.	-	-

Remove LPCA Cover. Refer to LPCA Cover Removal.

Figure 1. A Port Coil Connector
Cut the 4 tie wraps fixing cables.
Remove the following connectors. (BNC, J17 BNC, Sub-D Connector J19, J20, J1 – J8 BNC connectors from MC pre-amp (Input Side) and 2 LED cable-With LED).

Figure 2. connectors
Cut the tie wrap fixing coil port cables.
Remove 2 screws from A Port Coil Connector assy.
Remove A Port Coil Connector assy from the L brackets.

Figure 3. Remove A Port Coil Connector
Install new A Port Coil Connector assy to the L brackets with 2 screws.

When the installing the coil port cables, perform the noise countermeasure. The noise countermeasure is to wind up coil port cable of J19 connector and restrain it with 4 tie-wraps. Without this countermeasure, the coil port cable generates a loop and can pick up RF Pulses and which has a possibility to damage a resistor in 8ch Cross point Switch. This countermeasure prevents loop generation by winding up the coil port cable.

Wind up the coil port cables of J19 connector three times.
Restrain the coil port cable with 4 tie-wraps.

Figure 4. Installation of coil port cable (J19 connector)
Connect the all connectors to the preamplifier and BNC.
Restore new A Port Coil Connector assy by the reverse order of the removal.

Restore the Power. Refer to Lockout / Tagout for System Cabinet PDU Main Breaker.
Run MCR tool.
Run one head or body scan.