NEC EXPRESS5800/120Md Series User Manual page 110

If installing an optional processor, and the heat sink is not attached,
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attach it to the processor with the five screws provided in the option kit.
If installing an optional processor, and it does not have latches, attach
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one at each end of the cartridge.
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Open the latches on the cartridge or board and align the device with the
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retention module and connector slot.
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Slide the processor cartridge or terminator board into the retention
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module until resistance is felt.
Note:
sure it goes through three steps. The Processor is gradually
inserted into the socket each time it is pressed, which is one
step. It is firmly seated in the socket after going through
three steps.
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7. Lock the processor cartridge or terminator board in place by positioning the
retention lockwires over the latches and pushing the latches down.
8. Replace the processor cooling baffle (see "Removing or Installing the
Cooling Baffle" earlier in this section) removed earlier in these procedures.
9. Set the processor frequency using the appropriate jumpers on the processor
speed jumper block located on the on the system board (see Configuring
System Jumpers in Chapter 3).
10. Replace the option board cover; plug in the system power cord(s), and
power up the system.
4-18 Upgrading Your System
Latches may be included with the optional processor or you can
remove the latches from the terminator board.
Slightly spread open each latch. Use care to prevent latch breakage.
Position the latch so that the two pins on the latch fit into the two pin
holes at the corners of the cartridge.
If installing a processor cartridge, align it so that the heat sink faces
down.
If installing a terminator board, align it so that the open side of the
circuit board faces up.
While pushing the processor into its socket make
Continue sliding the device into the module until it seats.
You should hear three distinct clicks as it seats in the module and
connector.
Check that the device is firmly seated.