Remove the lower processor board (MB)

Follow instructions in this section to remove the lower processor board (MB).

About this task

S002

CAUTION

The power-control button on the device and the power switch on the power supply do not turn off the electrical current supplied to the device. The device also might have more than one power cord. To remove all electrical current from the device, ensure that all power cords are disconnected from the power source.

Important

• This task must be operated by trained technicians that are certified by Lenovo Service. Do not attempt to remove or install the part without proper training and qualification.

• When removing the memory modules, label the slot number on each memory module, remove all the memory modules from the lower processor board (MB), and set them aside on a static-protective surface for reinstallation.

• When disconnecting cables, make a list of each cable and record the connectors the cable is connected to, and use the record as a cabling checklist after installing the new lower processor board (MB).

Attention

• Read Installation Guidelines and Safety inspection checklist to ensure that you work safely.

• Power off the server and peripheral devices, disconnect the power cords from the primary chassis, then disconnect the power cords from the secondary chassis. See Power off the server.

• Prevent exposure to static electricity, which might lead to system halt and loss of data, by keeping static-sensitive components in their static-protective packages until installation, and handling these devices with an electrostatic-discharge wrist strap or other grounding system.

• If the server is installed in a rack, remove the server from the rack. See Remove the server from rails.

Procedure

1. Make preparation for the task.
   1. Gently pull and disengage every installed power supply unit. See Remove a hot-swap power supply unit.
   2. Remove the front top cover. See Remove the front top cover.
   3. Remove the fan cage. See Remove the fan cage.
   4. Remove both power interposer boards. See Remove the power interposer board.
   5. Remove the power distribution board. See Remove the power distribution board.
   6. Remove the upper processor board (CPU BD) air baffle. See Remove the upper processor board (CPU BD) air baffle.
   7. Remove the upper processor board (CPU BD). See Remove the upper processor board (CPU BD).
   8. Remove the support bracket. See Remove the support bracket.
   9. For primary chassis only, remove the system I/O board and interposer assembly. See Remove the system I/O board and interposer board.
   10. Remove the lower processor board (MB) air baffle. See Remove the lower processor board (MB) air baffle.
   11. For primary chassis only, remove the front operator panel and front operator panel cage. See Remove the front operator panel.
   12. Remove the PHMs. See Remove a processor and heat sink.
   13. Remove the memory modules. See Remove a memory module.
   14. Remove the sideband card. See Remove the sideband card.
   15. Remove the MicroSD card. See Remove the MicroSD card.
   16. Remove all the M.2 drive from the lower processor board (MB). See Remove an M.2 drive.
   17. Remove all PCIe adapters on the lower processor board (MB). See Remove a PCIe adapter.
2. Disconnect UPI module cables.
   Figure 1. Disconnecting UPI module cables
   
   
   1. Open the cable clips and unhook the UPI module cables.
   2. Disconnect the UPI module cables from the lower processor board (MB).
3. Disconnect the internal UPI cables from the lower processor board (MB).
   Figure 2. Disconnecting internal UPI cables

   
   
   
4. For primary chassis only, disconnect the SCM cable.
   Figure 3. Disconnecting SCM cable
   

   

   
   
   1. Loosen the two thumbscrews on the SCM bracket. Use a screwdriver if needed.
   2. Remove the SCM bracket.
   3. Disconnect the SCM cable from the lower processor board (MB).
5. Make a list of all the cables connected to the lower processor board (MB); then, disconnect all the cables. See Internal cable routing.
6. Remove the lower processor board (MB).
   Figure 4. Lower processor board (MB) removal

   
   
   

   Note

   This lower processor board (MB) handle only serves the purpose of removing the lower processor board (MB). Do not attempt to lift the whole chassis with it.
   1. Loosen the thumbscrew that secures the lower processor board (MB). Use a screwdriver if needed.
   2. Grasp the thumbscrew and lower processor board (MB) handle; then, slide the lower processor board (MB) slightly towards the rear of the chassis to disengage and remove it.