DIG2 SAS Controller Replacement

Prerequisites

Table 3. Replacement parts
Item	Quantity	Effectivity	Part number	Manufacturer
DIG2 Computer SAS Controller Card	1	-	5304439	LSI Logic

Table 4. Safety

POTENTIAL FOR INJURY TO SERVICE PERSONNEL
THE DIG2 COMPUTER CAN WEIGH IN EXCESS OF 45 POUNDS.
DEPENDING ON YOUR HEIGHT AND ACCESS TO EQUIPMENT REMOVAL/INSTALLATION, LIFTING ASSISTANCE MAY BE REQUIRED. USE YOUR JUDGMENT TO DETERMINE IF LIFT ASSIST OR A SECOND PERSON MAY BE REQUIRED TO ASSIST IN REMOVAL AND INSTALLATION.

TO PREVENT DAMAGE TO COMPONENTS WITHIN THE DIG2, OBSERVE THE FOLLOWING ESD PRECAUTIONS:
WORK ON A STATIC-FREE MAT.
WEAR A STATIC STRAP TO ENSURE THAT ANY ACCUMULATED ELECTROSTATIC CHARGE IS DISCHARGED FROM YOUR BODY TO GROUND.
CREATE A COMMON GROUND FOR THE EQUIPMENT YOU ARE WORKING ON BY CONNECTING THE STATIC-FREE MAT, STATIC STRAP AND PERIPHERAL UNITS TO THAT PIECE OF EQUIPMENT.
FOR FURTHER INFORMATION REGARDING ESD PROTECTION, REFER TO THE SAFETY CHAPTER IN THIS PUBLICATION

IN ORDER TO MEET EMC REQUIREMENTS, THE CHASSIS MODULES MUST BE PROPERLY INSTALLED AFTER SERVICING. CHECK THAT THE MODULES ARE MOUNTED FIRMLY IN PLACE AND LOCKED DOWN WHERE APPLICABLE.

FOLLOW ALL REQUIRED SAFETY AND PPE PROCEDURES CUSTOMARY FOR YOUR ORGANIZATION WHEN WORKING ON THIS PRODUCT.

Table 5. Required conditions
Condition	Reference	Effectivity
Access to both the front and rear of the Operator Console is required. Move the console away from walls and remove obstacles in room.	-	-
Only trained service personnel should service the GE CT Scanner.	-	-

Overview

This procedure describes and illustrates the steps necessary to replace the Data Acquisition & Image Generation (DIG2) Computer SAS Controller Card.

Select one of the following methods to power off the Operator Console:
- If applications are running, click the Shut Down icon and select Shut Down.
- If applications are down, open a Unix Shell using the Toolchest. Type: {ctuser@hostname} halt. Press Enter.
The Operator Console monitor will display a ‘System Halted’ message when it is acceptable to power off the Operator Console.
Power OFF the Operator Console at the front panel switch. (See Figure 2.)

Figure 2. Console Power Switch
Perform prescribed Lockout/Tagout procedure. For added protection, disconnect the Twist-N-Lock Main Power Cable from rear of console.

Remove the front and rear Operator Console Covers per prescribed cover removal procedure.
Remove the cable connections at the rear of the DIG2 Computer chassis.

note:
Verify that all cables are labeled and clearly marked. iF necessary, add a label for clarity.
Remove the power cord at the rear of the DIG2 Computer chassis.
Remove the four (4) 5mm socket cap screws and washers from the front of the DIG2 Computer chassis, holding the chassis to the Operator Console rack.

Figure 3. DIG2 Computer Mounting
Slide the DIG2 Computer chassis forward (out the front of console) and set aside. See the Safety, Equipment Service - Console chapter of the service manual for additional information regarding Console Component Lifting.

At the rear of the DIG2 Computer Chassis, release the Chassis Cover Lock using a Phillips screwdriver. Back out lock screw at least two (2) full turns.

Figure 4. DIG2 Computer Chassis Cover Lock
Slide the Chassis Cover towards the front of the chassis and remove.

note:
You may need to tap on back upper edge of cover to release cover before sliding forward.

Figure 5. DIG2 Computer Cover Removal
Remove the Expansion Card Hold-down Clamp from DIG2 Computer Chassis.

Figure 6. DIG2 Computer Expansion Card Hold-down Clamp Removal
Remove the Phillips Screw holding the SAS Controller Card in the DIG2 Computer chassis and carefully remove the card from the Systemboard.

Figure 7. VDIG2 Computer SAS Controller Card Location

Carefully install the replacement SAS Controller Card in the same location (slot) in the DIG2 Computer. Make sure all cables are clear of the SAS Controller Card and the card seats firmly in the Systemboard.

Figure 8. VDIG2 Computer SAS Controller Card Slot Location
Reinstall the Phillips Screws to secure the SAS Controller Card to the chassis.
Reinstall the Expansion Card Hold-down Clamp in the DIG2 Computer Chassis.

Figure 9. DIG2 Computer Expansion Card Hold-down Clamp Placement

note:
The Expansion Card Hold-down Clamp must be installed as illustrated above. The Clamp should be centered over the Cooling Fan with slotted end over expansion cards.
Reinstall the DIG2 Computer Chassis Cover and lock the cover in place.

Slide the replacement DIG2 Computer into the Operator Console from the front.
Replace the four (4) 5mm socket cap screws and washers to secure the DIG2 Computer chassis to the Operator Console rack. Torque to 4.6 N-m.
Mount the power cord to the rear of the DIG2 Computer chassis and verify that its power supply switch is turned to the ON position.
Replace the rear cable connection(s).

Figure 10. VDIG2 Cable Connections and Destination

For cabling details, refer to the appropriate interconnect located in the System Diagrams folder of this service methods publication.

Reconnect the Twist-N-Lock Main Power Cable from rear of console and remove Lockout Tagout protection applied earlier.
Power ON the Operator Console at the console front panel switch.
Visually verify the DIG2 Computer front panel Power LED is illuminated. If not, press the DIG2 front panel power switch to apply power to the DIG2 Computer.

Figure 11. DIG2 Front Panel Indicators and Switches

Verify that the DIG2 Computer has powered up and is not displaying or sounding any POST Errors.

note:
See DIG2 Troubleshooting if any errors appear.
No other verifications steps required.

Refer to System Scanning Tests in the Functional Checks chapter of this manual to confirm proper operation.
Reinstall Console Front and Rear Covers.

Item	Quantity	Effectivity	Part number	Manufacturer
Standard FE Toolkit	1	-	-	-
4 mm Hex Key Wrench	1	-	-	-
Phillips Screwdriver	1	-	-	-