Gradient Cable ASM (PS to AMP) Replacement

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1	Not Applicable	60 minutes	15 minutes

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
Non Magnetic Tool Set	1	-	-	-
Digital volt meter (DVM) with alligator clip leads	1	-	-	-

Table 3. Replacement parts
Item	Quantity	Effectivity	Part number	Manufacturer
SSSD Power Panel Assy	1	-	Refer to FRU Manual	-

Table 4. Safety

DANGER

STRONG MAGNETIC FIELD!

FERROUS MATERIALS CAN BECOME DANGEROUS PROJECTILES IN THE PRESENCE OF THE MAGNETIC FIELD PRODUCED BY THE MAGNET.

Do not Bring any ferromagnetic tools or equipment into the magnet room.

DANGER

FATAL ELECTRIC SHOCK HAZARD!!

The gradient amplifiers act as constant load sources, and will send maximum current to any load including any human who get across the outputs.

To prevent fatal electric shock, follow LOTO to disable and verify safe voltage levels.

Notice

It will typically take about 10 minutes to discharge the capacitor in SSSPS after ISC Power is off.

Use this 10 minutes for the rear covers removal before accessing the Gradient Cable ASM.

Open ISC Cover.

Confirm that there is no input voltage at the terminal of SSSPS using DVM.

Figure 1. Voltage Check
Perform the following steps.
1. Disconnect two connectors.
2. Loosen six screws.
3. Remove Leak sensor assy.
Figure 2. Remove Leak Sensor

CAUTION

Electric Shock Hazard!

Voltage exists in the capacitor of SSSA and SSSPS.

Disconnect the SSSA and SSSPS before removing the Power Panel Assy.

Perform the followings to disconnected from rear power panel. Do the same for the related SSSA and SSSPS.

Loosen fixing screws and remove ISC PW Cover by lifting up a little.

Note: If furnished closet door prevents from removing, the PW cover can be separated in two pieces by removing 6 screws at center.

Figure 4. ISC PW Cover
Remove Gradient Cable Cover per following steps.
1. Loosen 12 screws.
2. Lift up a little and remove the Gradient Cable Cover.
Figure 5. Gradient Cable Cover
At Pen Wall side, remove cover for SSSD Power Panel Assy.
1. Loosen screws for key holes shown in illustration below.
2. Remove three screws at left bottom area and one screw at center joint area.
3. Lift up the cover and remove it.
Figure 6. Cover for SSSD Power Panel Assy

CAUTION

Electric Shock Hazard!

Voltage exists in the capacitor of SSSA and SSSPS.

Make sure SSSA and SSSPS are withdrawn before removing the Power Panel Assy.

Confirm that there is no voltage at the terminal of Gradient Cable Asm using DVM.

Remove defective Power Panel Assy.
1. Remove four screws and remove Gradient Cable Asm for defective axis.
2. Remove two screws and remove defective Gradient Cable Asm for SSSPS.
Figure 7. Gradient Cable Asm PS to AMP
Restore the new assy by reverse order of removal.

Note: Make sure to tighten each screw.