16CH Mega Switch for 1.5T

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1	Not Applicable	30 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
Mega Switch	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 System Cabinet PDU Main Breaker LOTO Procedure.	-	-

Remove right middle side cover and right side covers.
- Side Middle Cover (Left side Only)
- Side Covers (Left side Only)
Remove Left Side Bracket.

Figure 1.
Disconnect all connectors from Mega Switch.

Note:
Handle the Fibre Optic cables with care, they are very fragile.

Figure 2. Mega Switch Cable Removal

CAUTION

Mega Switch contains ferrous materials.

Do not bring it very close to magnet bore during replacement.

If it is very close to the magnet bore, it will be attracted to the bore with great force.

Loosen 4 screws and remove Mega Switch.

Perform the following Diags and confirm that all of the tests are passed.
Perform System Gain Calibration.
Perform one Body or Head Scan.
Perform SPT Coherent Noise Test .
Note:
Perform SPT Coherent Noise Test Only by selecting 'No' for 'Select All Tests?' and 'ON' for 'Coherent Noise'. No need to perform SPT Full test.