NEC POWERMATE PROFESSIONAL 9000 Service Manual page 172

3-18 Option Installation
Figure 3-12 Aligning the Processor with the Retention Mechanism
Secure the processor by locking the tabs at either end of the processor in the
3.
retention mechanism.
Reconnect cables that were disconnected to gain access the processor socket.
4.
5. Replace the drive cage (see "Replacing the Drive Cage").
6. Replace the left cover on the system unit (see "Replacing the Covers").
CAUTION: In a single processor configuration,
the processor must be installed in the boot
processor Slot 1 connector (the slot closest to
the back panel) and a termination card must be
installed in the application processor slot. If the
processor is installed in the second Slot 1
connector (the application processor slot), the
computer will not boot.