NEC EXPRESS5800/120Re-2 Service Manual page 119

When performing Step 6, make absolutely sure the locking
lever is in its full open position (120-135 degrees) prior to
insertion of the CPU. Catastrophic failure may result from
improper insertion!
6. Raise the processor locking bar on the socket. See Figure 4-13.
Figure 4-13. Raising the Processor Locking Lever
7. Orient the processor so that the triangle on the corner of the processor aligns
with the triangle on the corner of the socket. See Figure 4-14.
8. Aligning the pins of the processor with the socket, insert the processor into
the socket. The processor should drop into the socket without requiring any
force.
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Figure 4-14. Installing the Processor
9. Lower the locking bar completely. See Figure 4-15.
! CAUTION
Disassembly and Reassembly 4-17