IBM 2283, Hardware Maintenance Service

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90 IBM Desktop System HMM
Removals and Replacements
BEFORE REMOVING ANY FRU, POWER-OFF THE
COMPUTER, UNPLUG ALL POWER CORDS FROM
ELECTRICAL OUTLETS, THEN DISCONNECT ANY
INTERCONNECTING CABLES.
ATTENTION: The system board, processors,
adapter cards, DIMMs, and upgrade
processors can be damaged by electrostatic
discharge. Use an electrostatic discharge
(ESD) strap to establish personal grounding. If
you don't have an ESD strap, establish
personal grounding by touching a ground point
with one hand before touching the static-
sensitive FRUs.
The arrows in the removals and replacements
procedures show the direction of movement to
remove a field-replaceable unit (FRU), to turn a
screw, or the direction to press a tab to release the
FRU.
Begin all removals by removing the cover (and rear
cover, if applicable).
When other FRUs must be removed prior to removing
the failing FRU, they are listed at the top of the page.
Go to the removal procedure for each FRU listed,
remove the FRU, and then continue with the removal
of the failing FRU.
To replace a FRU, reverse the removal procedure
and follow any notes that pertain to replacement.
Before disconnecting any cables, note their location
and orientation. Reinstall any new FRUs with cabling
in their original location.