MC Box Chassis Replacement

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
MC Box Chassis (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
System Power must be turned OFF. Refer to Lockout / Tagout for System Cabinet PDU Main Breaker.	-	-


Last Update	07/17/2009

Remove LPCA Cover. Refer to LPCA Cover Removal.
Remove all the cables from MC Box Assy.
Remove 2 screws from rear of MC Box Assy.

Figure 1. Two screws
Loose 4 screws that fix the front of MC Box Assy.
Slide the defective MC Box Assy toward the rear side slightly to steer clear of the belt screws and then slide towards the front to remove it.

Figure 2. MC Box assy removal
Loosen a screw that fixes the fixture bar.
Slide and remove the fixture bar.

Figure 3. Remove Fixture Bar
Slide and remove all Pre-Amp.

Figure 4. Remove Pre-Amp
Restore all preamps to the new MC Box Chassis.
Restore the 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.