Exchange the CEC enclosure power midplane

Before you begin

CAUTION:

This assembly contains mechanical moving parts. Use care when you service this assembly. (C025)

Icon for electrostatic discharge wrist strap Use approved ESD procedures to prevent damage.

Attention:

This procedure is not a stand-alone procedure. Customer disruption and damage to the hardware might occur when microcode and power boundaries are not in the proper conditions for this service action.
If a serviceable event FRU repair directed you to this procedure, the microcode and power boundaries are already set.
If a serviceable event FRU repair did not direct you to this procedure, see MAP1230 Replace a FRU without using a serviceable event.

Notes:

All the cables and FRUs to be removed must be uniquely identified so they can be reinstalled correctly.
If an installed earthquake resistance kit prevents you from accessing this FRU, refer to MAP1600.

Preparing the CEC enclosure to remove and replace the power midplane

Procedure

Use a replacement part with a valid DS8000® part number to ensure that it has the proper firmware, VPD, or configuration to ensure that it is compatible with the DS8000 service procedures. Attempting to use a generic server FRU might fail and require next level of support to recover.
All parts being removed must be marked or identified so they can be installed into their original locations.

Note: Failure to do this can extend the service duration and might require next level of support assistance.
The management console keyboard can be moved between the operating and stowed position as needed to allow service clearance above the CEC enclosure.
Use the front and rear blue identify LEDs to determine the CEC enclosure to be repaired. Both blue LEDs should be lit.
- CEC control panel blue identify LED as shown in Figure 1.
- CEC enclosure rear blue identify LED as shown in Figure 2.
Note: If both the front and rear CEC enclosure identify LEDs are not lit, use the location code listed in the serviceable event FRU list. See MAP1245 Finding FRUs by using location codes.

Figure 1. Control panel LEDs

Figure 2. CEC enclosure rear LEDs
Verify that the CEC enclosure is in the power-off state. See Figure 3
1. At the rear of the CEC enclosure, view all CEC enclosure power supply DC LEDs.
2. Are all DC (output) LEDs flashing?
  - Yes, continue with the next step.
  - No, do not continue with this FRU replacement. Go to MAP4841 CEC enclosure fails to power off during service processor repair (Models 961, 98x).
Figure 3. Location of the power supplies and LEDs (Model 982)
Attach the electrostatic discharge (ESD) wrist strap.
Attention:
- Attach an electrostatic discharge (ESD) wrist strap to an unpainted metal surface of your hardware to prevent the electrostatic discharge from damaging your hardware.
- When using an ESD wrist strap, follow all electrical safety procedures. An ESD wrist strap is used for static control. It does not increase or decrease your risk of receiving electric shock when using or working on electrical equipment.
- If you do not have an ESD wrist strap, just before removing the product from ESD packaging and installing or replacing hardware, touch an unpainted metal surface of the system for a minimum of 5 seconds.
Disconnect the power cords from the CEC with the DC (output) LEDs flashing. See Figure 4.
Notes:
- Ensure that the power cords are correctly labeled.
- The power supply LEDs might continue to flash for up to 20 seconds while internal power is discharged.
- The power cord is fastened to the system by using the hook-and-loop fastener . Unstrap the fastener to allow the enclosure to be placed in the service position.
Figure 4. Removing the power cords (Models 982, 988)
Observe the CEC enclosure control panel green power button LED . See Figure 5.
- If it is off, go to the next step.
- If it is flashing, the CEC enclosure is still in the power-off state. DO NOT CONTINUE. Ensure that you have unplugged the power cables.
Figure 5. Control panel LEDs

Disconnect all remaining cables from the rear of the CEC enclosure. See Table 1 and Figure 6.

Table 1. CEC enclosure cable connections
Connection	Description
P1-C2-T1, P1-C2-T2	PCIe to I/O enclosures (if C2 present)
P1-C3-T1, P1-C3-T2	PCIe to I/O enclosures (if C3 present)
P1-C5-T4 (HMC port 1)	FSP Ethernet
P1-C5-T5 (HMC port 2)	FSP Ethernet
P1-C6-T1, P1-C6-T2	i2c to RPCs
P1-C7-T1, P1-C7-T2	RS485 to RPCs
P1-C8-T1, P1-C8-T2	PCIe to I/O enclosures
P1-C10-T1, P1-C10-T2	PCIe to I/O enclosures
P1-C11-T1, P1-C11-T2	LPAR Ethernet
P1-C11-T3, P1-C11-T4	Customer network (optional feature, if used)
P1-C12-T1, P1-C12-T2 P1-C12-T3, P1-C12-T4	Customer network (optional feature, if used)

Remove filler plugs (if present) at the rear of the CEC enclosure. See Figure 6.
1. Remove the filler plugs (if present) from USB ports P1-T1, P1-T2, P1-C5-T1, P1-C5-T2 and serial port P1-C5-T3.
2. Remove the filler plugs (if present) from Ethernet ports P1-C11-T3 and P1-C11-T4.
3. Remove the filler plugs (if present) from Ethernet ports P1-C12-T1, P1-C12-T2, P1-C12-T3, and P1-C12-T4.
Figure 6. CEC enclosure location codes (rear view) (Model 982)
Label and remove the power supplies.
1. Label and disconnect the power cord from the power supply.
  
  Attention: Do not remove the power cord from the cable-management arm.
2. Label the power cord, and then unstrap the hook-and-loop fastener to release the power cord from the power supply handle. Refer to in Figure 7.
3. Pull the end of the power cord out of the power supply in the direction that is shown in Figure 7.
4. Retain the hook-and-loop fastener for the replacement procedure.
5. To unseat the power supply from its position in the system, push the terracotta locking-tab in the direction shown in Figure 7.
6. Pull the power supply away from the system, as shown in Figure 7.
7. Place the power supply on the ESD mat.
8. Repeat step 11.b for the remaining power supplies.
Figure 7. Removing a CEC enclosure power supply
Remove the front cover.

CAUTION:
A hot surface nearby.
1. Ensure that you have the electrostatic discharge (ESD) wrist strap attached. If not, attach it now.
2. Place your fingers on the indentations and pull the latches located on both sides of the cover.
3. Pull the cover away from the system.
Figure 8. Removing the front cover
Place the CEC enclosure into the service position.
Note:
- When placing the enclosure into the service position, ensure that all stability plates are firmly in position to prevent the rack from toppling.
- Ensure that only one enclosure is in the service position at a time.
- Ensure that the cables at the rear of the system unit do not catch or bind as you pull the system unit forward in the rack.
- When the rails are fully extended, the rail safety latches lock into place. This action prevents the system from being pulled out too far.
1. Remove the shipping screws, if they are not removed already.
2. Release the side latches by pressing them downward and then outward as shown in Figure 9.
3. Slide out the system unit from the rack.
Figure 9. Placing the enclosure in service position
Remove the service access cover.
1. Ensure that you have the electrostatic discharge (ESD) wrist strap attached. If not, attach it now.
2. Push the release latches in the direction shown.
3. Slide the cover off the system unit. When the front of the service access cover has cleared the upper frame ledge, lift the cover up and off the system unit.
Figure 10. Removing the service access cover
Remove the safety cover.
1. Ensure that you have the electrostatic discharge (ESD) wrist strap attached. If not, attach it now.
2. Loosen the thumbscrew located at the rear of the cover, by turning it in the direction shown in Figure 11.
3. Slide the safety cover toward the rear of the system. When the front of the cover has cleared the upper frame ledge, lift the cover up and off the system.
Figure 11. Removing the safety cover

Removing the CEC enclosure power midplane

Procedure

Complete the following steps to remove the CEC enclosure power midplane.

Ensure that you have the electrostatic discharge (ESD) wrist strap attached. If not, attach it now.
Remove the RAID assembly.
1. Loosen, but do not remove the recessed shipping screws in the RAID assembly by using a 4 mm Allen wrench, as shown in Figure 12.
  
  Figure 12. Loosening the shipping screws
2. Turn the thumbscrews in the direction shown. Pull out the latches and remove the RAID assembly from the system, as shown in Figure 13.
3. Place the RAID assembly on the ESD mat.
  
  Figure 13. Removing the RAID assembly from the system
Label and remove all of the front fans.
1. Rotate the fan handle in the direction that is shown in Figure 14 to unlock the fan from its slot.
2. Hold on to the fan handle and by using your hand to support the bottom of the fan, pull out the fan from its slot.
3. Place the fan on the ESD mat.
4. Repeat step 3 for the remaining fans.
  
  Figure 14. Removing the front fan
Assemble the supplied system backplane support stand. Refer to the assembly instructions that were shipped with this FRU. The system backplane that is removed must be placed on the support stand to protect its electrical connectors.
Remove the system backplane.
1. Loosen, but do not remove the four captive screws by using a 4 mm Allen wrench. See Figure 15.
  
  Figure 15. Unscrewing the system backplane
2. Raise the system backplane handles on the sides of the backplane as shown in Figure 16.
3. Unscrew the two thumbscrews and rotate the brackets up 45 degrees.
  
  Figure 16. Preparing the system backplane for removal
4. Grasp the handles and lift the system backplane out of the system as shown in Figure 17.
  
  Figure 17. Lifting the system backplane out of the system
5. Place the system backplane on the support stand to keep the connectors on the bottom of the backplane suspended off the ESD mat.
Press the latch of the front USB cable and unplug the cable from the I/O backplane. Remove the cable from the retainer clips and . Carefully pull the cable out of the I/O backplane. See Figure 18.

Figure 18. Unplugging the USB cable
Remove the I/O backplane.
1. Loosen the four captive screws that secure the sides of the I/O backplane by using a #1 Phillips screwdriver. Loosen the two captive screws in the center of the I/O backplane by using a 4 mm Allen wrench, as shown in Figure 19.
  
  Figure 19. Unscrewing the I/O backplane
2. Unscrew the three captive screws in the front of the I/O backplane by using a #1 Phillips screwdriver. Grasp the sides of the I/O backplane and lift it out of the system, as shown in Figure 20.
  
  Figure 20. Removing the I/O backplane
Unscrew and remove the nine screws securing the power midplane by using a 4 mm nut driver. See Figure 21.
Lift the power midplane out of the system. See Figure 21.

Figure 21. Removing the power midplane

Replacing the CEC enclosure power midplane

Procedure

Complete the following steps to replace the CEC enclosure power midplane.

Ensure that you have the electrostatic discharge (ESD) wrist strap attached. If not, attach it now.
Replace the power midplane into the system. See Figure 22.
Replace and tighten the nine screws securing the power midplane by using a 4 mm nut driver. See Figure 22.

Figure 22. Replacing the power midplane
Replace the I/O backplane.
1. Grasp the sides of the I/O backplane and place it in the system. Tighten the three captive screws in the front of the I/O backplane by using a #1 Phillips screwdriver, as shown in Figure 23.
  
  Figure 23. Replacing the I/O backplane
2. Tighten the four captive screws that secure the sides of the I/O backplane by using a #1 Phillips screwdriver. Tighten the two captive screws in the center of the I/O backplane by using a 4 mm Allen wrench, as shown in Figure 24.
  
  Figure 24. Tightening the I/O backplane screws
Route the front USB cable through the I/O backplane and plug the cable onto the I/O backplane. Secure the cable in the retaining clips and , as shown in Figure 25.

Figure 25. Plugging the front USB cable onto the I/O backplane
Replace the backplane into the system.
1. Lower the system backplane into the system by using the handles on the side of the backplane as shown in Figure 26.
  
  Figure 26. Replacing the system backplane
2. Lower the handles . See Figure 27.
3. Lower the hinged brackets and tighten the thumbscrews.
  
  Figure 27. Tightening thumbscrews and lowering handles
4. Tighten the four captive screws of the system backplane by using a 4 mm Allen wrench. See Figure 28.
  
  Figure 28. Tightening the system backplane screws
Replace the front fans.
1. Ensure that the fan handle is rotated open as shown in Figure 29.
2. Using your hand to support the bottom of the fan, align the fan with the fan slot and slide it into the system.
3. Rotate the fan handle in the direction that is shown and then press the fan handle until the latch locks in place. See Figure 29.
4. Repeat step 7 for the remaining fans.
  
  Figure 29. Replacing the front fan
Slide the RAID assembly into the system. Push latches in and tighten thumbscrews, as shown in Figure 30.

Figure 30. Replacing the RAID assembly

Preparing the CEC enclosure for operation after removing and replacing the power midplane

Procedure

Complete the following steps to prepare the system for operation.

Ensure that you have the electrostatic discharge (ESD) wrist strap attached. If not, attach it now.
Replace the safety cover.
1. Push the safety cover toward the chassis.
2. Tighten the thumbscrew by turning it in the direction shown in Figure 31 to fix the safety cover to the chassis.
Figure 31. Replacing the safety cover
Replace the service access cover.
1. Slide the cover onto the system unit.
2. Close the release latches by pushing them in the direction shown.
Figure 32. Installing the service access cover
Place the CEC enclosure into the operating position.

CAUTION:
Pinch hazard.
1. Ensure that you have the electrostatic discharge (ESD) wrist strap attached. If not, attach it now.
2. Unlock the blue rail safety latches by lifting them upward.
3. Push the system unit back into the rack until both system unit release latches lock into position.
  
  Note: Slide the system unit slowly into the rack to ensure that your fingers do not get caught in the side rails.
4. Secure the enclosure to the rack with screws, if screws were removed when preparing the enclosure for service.
Figure 33. Placing the CEC enclosure into the operating position
Replace the front cover.
1. Ensure that you have the electrostatic discharge (ESD) wrist strap attached. If not, attach it now.
2. Position the cover on the front of the system unit so that the four pins on the system match the four holes at the rear of the cover.
3. Press the tabs to snap the cover into position.
Figure 34. Installing the front cover
Attach the electrostatic discharge (ESD) wrist strap.
Replace the power supplies into their original positions.
1. Align the power supply with the bay and slide the power supply into the system until the terracotta latch locks in place, as shown in Figure 35.
2. Connect the power cord to the power supply , as shown in Figure 35.
3. Use the hook-and-loop fastener D and tie the power cord to the power supply handle, as shown in Figure 35.
4. Repeat step 7.c for the remaining power supplies.
  
  Figure 35. Replacing a power supply

Reconnect all cables, except for power cords. See Table 2 and Figure 36.

If optical Ethernet connections are used, use proper cleaning procedures.

Important: The optical cable plugs (LC connectors) and ports (SFPs) must be cleaned before connecting them. Use cleaning tool 54Y4392 or IBM-approved alternative. After cleaning SFPs with the tool, use air bulb 45D2645 or IBM-approved alternative. For detailed procedures, refer to current DS8000 Info Alerts or contact your next level of support.

Table 2. CEC enclosure cable connections
Connection	Description
P1-C2-T1, P1-C2-T2	PCIe to I/O enclosures (if C2 present)
P1-C3-T1, P1-C3-T2	PCIe to I/O enclosures (if C3 present)
P1-C5-T4 (HMC port 1)	FSP Ethernet
P1-C5-T5 (HMC port 2)	FSP Ethernet
P1-C6-T1, P1-C6-T2	i2c to RPCs
P1-C7-T1, P1-C7-T2	RS485 to RPCs
P1-C8-T1, P1-C8-T2	PCIe to I/O enclosures
P1-C10-T1, P1-C10-T2	PCIe to I/O enclosures
P1-C11-T1, P1-C11-T2	LPAR Ethernet
P1-C11-T3, P1-C11-T4	Customer network (optional feature, if used)
P1-C12-T1, P1-C12-T2 P1-C12-T3, P1-C12-T4	Customer network (optional feature, if used)

Replace filler plugs (if removed) at the rear of the CEC enclosure. See Figure 6.
1. Replace the filler plugs in USB ports P1-T1, P1-T2, P1-C5-T1, P1-C5-T2 and serial port P1-C5-T3.
2. Replace the filler plugs in Ethernet ports P1-C11-T3 and P1-C11-T4.
3. Replace the filler plugs in Ethernet ports P1-C12-T1, P1-C12-T2, P1-C12-T3, and P1-C12-T4.
Figure 36. CEC enclosure location codes (rear view) (Models 982, 988)
Reconnect the power cords to the CEC enclosure. See Figure 37.
Fasten the power cords to the enclosure by using the hook-and-loop fasteners .

Figure 37. Connecting the power cords
Verify that the CEC enclosure has power available. See Figure 38.
1. At the rear of the CEC enclosure, view the CEC enclosure power supply DC LEDs.
2. Are all DC (output) LEDs flashing?
  - Yes, continue with the next step.
  - No, ensure the power cords are properly connected. If no connection problem is found, contact your next level of support.
Figure 38. Location of the power supplies and LEDs (Model 982, 988)
Wait up to 5 minutes for the CEC enclosure control panel power-button LED to flash. See Figure 39.

Note: This ensures the CEC enclosure is in the power-off state.

Is the power-button LED flashing?
- Yes, go to the next step.
- No, ensure that the CEC enclosure power supplies are fully seated. The possible failing FRUs are the CEC enclosure system backplane, I2C interface card and cables, and control panel. You can also call the next level of support.
Figure 39. Control panel LEDs
Close the rear door of the rack.
Exit this service information center parts exchange procedure and return to the procedure that sent you here.