HP 2240 Owner's Manual page 166

B-48
NOTICE: The Model 282 and 2240 can be configured
with two processors. A single processor must
be located in slot 0. Do not mix 282 and 2240
processors in the same system.
8.
When replacing a processor module, you must also remove the
dust cover it was shipped with. Grasp the module and pull the
dust cover evenly to remove.
9.
Install the processor by aligning the plastic guide rails on the
shroud with the rails on the processor. firmly seat module.
Figure B–29.J282/2240 Processor Modules