v Do not remove the device from the antistatic container until you are ready to install the device in the
system unit.
v With the device still in its antistatic container, touch it to a metal frame of the system.
v Grasp modules by the heatsink. Avoid touching the interposer buttons.
v If you need to lay the device down while it is out of the antistatic container:
– Lay the MCMs with the posts down on an antistatic mat.
– Before picking it up again, touch the antistatic container and the metal frame of the system unit at
the same time.
v Handle the devices carefully in order to prevent permanent damage.
Attention: Before you remove or replace any MCM module, STOP, read, and understand this entire
procedure. Also, check to ensure that the MCM/L3 Label Map is installed. Refer to Install the
MCM/L3/passthrough tri-fold plug map.
Attention: The MCM modules in this system can be attached to the backplane a maximum of three times.
Check the MCM/L3 Label Map to determine how many times the module has been removed before. If an
MCM module is removed for a fourth time, it must be replaced with a new MCM module.
Note: The MCM module, site label, and its associated VPD card are a single FRU, and must be replaced
as a set. See Models 870 and 890 - VPD card.
Attention: If the base configuration of the system has only one MCM, the pass-through modules are
replaced with a filler cover that attaches utilizing only the cam locks.
To remove MCM and pass-through modules:
Attention: If more than one module is to be replaced or reseated, begin with the topmost module, replace
it and then go to the next highest position module, until the lowermost module has been replaced or
reseated.
1. Power off the system, and unplug the power cord. See Power on/off the system and logical
partitions.
2. Remove the MSA (air mover) enclosure. See Models 870 and 890 - MSA (air mover) enclosure.
3. Perform a general cleaning operation using a sash brush (part number 450732) (not the one
included with the FRU kit) and vacuum cleaner to remove any accumulated dust and debris that has
settled in the processor subsystem. Hold the vacuum hose near the brush to remove any debris the
brush generates.
4. Note the location of the module being removed. Check the MCM/L3 Label Map sheet on the system
to confirm the number of times the target module has been unplugged. If three times, order a new
module. If this is the first removal/reseat for the module, record the serial number of the module and
the date of the action.
5. Ensure that the locking cams at the front of the MCM module are engaged with the module.
6. Remove and label DCA books and blanks m32 through m36, and both capacitor books. See Models
870 and 890 - DC converter assembly (DCA) and Models 870 and 890 - Capacitor books and blanks.
7. Ensure that the actuation bolt behind the MCM module is in the down position.
Figure 1. MCM module (processor) and passthru modules
106 Hardware (Remove and Replace; Part Locations and Listings)
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