Editing IBM RS/6000 Maintenance Guide (section)

== Opening the System ==

=== 7011 (pizza-box desktop) ===

# Power off, unplug, discharge PSU.
# Loosen the two thumbscrews at the rear top.
# Slide the cover back ~10 mm and lift off.
# The planar is on the chassis floor; PSU on the left; drive cage at the front.

=== 7012 / 7013 (deskside) ===

# Power off, unplug, discharge.
# Open the rear access panel (two captive screws).
# The CPU MCM card and memory cards mount in a vertical riser at the rear.
# Drive cage runs vertically up the front.
# PSU is at the top or rear, depending on submodel.

The MCM module on POWER2 7012-39H / 397 is large, heavy and surrounded by heatsink mass. '''Do not''' lift the MCM out unless you have the IBM extraction tool — the module pins are fragile and the seating force is high.

=== 7015 (rack) ===

Standard 19" rack handling rules. CPU drawer typically slides out on chassis rails; ground yourself before any work; never disconnect rear power without locking the rack rails first.

=== 7025 / 7026 / 7043 / 7044 (PCI tower / rack) ===

# Power off, unplug, discharge.
# Remove side panel (single thumbscrew or latch on most submodels).
# Planar mounts horizontally; PSU at top or top-rear; drives stacked vertically.
# CPU and memory cards on '''carrier cards''' that plug vertically into the planar.

=== 7248 (Carolina PReP) ===

# Power off, unplug, discharge.
# Remove the cover (two screws at the rear).
# Carolina motherboard is in the bottom of the chassis. ISA cards on the left riser; PCI cards on the right.