SIGNA MR355 / SIGNA MR360
Service Manual
5856356-3EN Revision 5.0
Basic Service Documentation. Copyright General Electric Company.
Object ID: 00000018WIA30611030GYZ
Topic ID: id_13107436 Version: 1.2
Date: Jul 5, 2019 11:19:00 PM

LPCA Assembly without cover

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1	Not Applicable	60 minutes	Not Applicable

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
Non Magnetic Tool Set	1	-	-	-

Table 3. Replacement parts
Item	Quantity	Effectivity	Part number	Manufacturer
LPCA Assy without cover (Refer to Illustrated Parts)	1	-	-	-

Table 4. Safety

DANGER

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.

Warning

ELECTROCUTION HAZARD!

DANGEROUS VOLTAGES ARE PRESENT AROUND THE MAGNET SUBSYSTEM WHEN ENERGIZED.

LOCK AND TAG OUT POWER TO THE magnet room BEFORE STARTING WORK.

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.	-	-

About this task


Last Update	07/30/2009

Procedure

Remove LPCA Cover. Refer to LPCA Cover Removal.
Remove all covers from Rear Pedestal.
Remove Bridge end cover.

Figure 1. Bridge end cover
Release the lever for the belt tension.

Figure 2. Release the lever
Mark on the belt at the edge of fixture plate with white pen so that the belt tension can be restored it is after the replacement.
Remove 2 belt fixture plates.

Figure 3. Removal of Belt fixture plates
Cut tie-wraps from LPCA.
Push out 4 LED and cables from the port with non-ferrous hexagon wrench.
Disconnect the all connectors from the preamp and BNC connector bracket.

Figure 4. Disconnecting All Connectors
Remove the tie-wrap base on the hypertron bracket. This tie-wrap base reuse to new LPCA.
Remove the 4 screws fixing a port coil connector assy (A port and B port).
Disconnected 3 connectors which connect B port and cables in cable track.
Remove A and B port coil connector assy from the bridge plate of LPCA.

Note:
A and B port coil connector reuse to new LPCA assy.

Figure 5. Removal of A Port Coil Connector
Remove 4 screws from cable/track assy, and move the cable/track assy to rear direction.

Figure 6. 4 screws of Cable and Track Assy
Remove the LPCA from the Rear pedestal.

Figure 7. Remove the LPCA
Install the removed A and B port coil connector assy and tie-wrap base to new LPCA assy.
Restore LPCA assy by the reverse order of the removal.

Note:
Make sure that all the tie wraps must be fixed at the same position before removal.

Note:
Connect the LED cable so that the cable is centered to the LED itself.

Figure 8.

Finalization

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