Processor Subsystem
This section contains the removal and replacement procedures for the processor subsystem. Handle all
processor subsystem FRUs with extreme care.
Installing the MCM/L3/Passthrough Plug Map
If the MCM/L3/Passthrough Plug Map is not installed in the system, install it before continuing with any
repair action for MCMs or L3 cache module.
With the front cover open, locate the right frame extender (located on the opposite side of the UEPO
switch). The 50 mm (approximately 2 inch) wide label should be installed vertically, along this extender,
approximately in line with EIA frame positions 22 - 28.
The trifold label has two hook-and-loop fastener strips attached to the back. Remove the adhesive backing
from the hook-and-loop fastener and attach it to the frame extender. A small piece of hook-and-loop
fastener is used to help keep it folded while attached to the frame. The label appears similar to the
following:
P/N 11P4914
Using this Label
Whenever an MCM/Passthrough module is added or replaced/reseated during a repair action, a sticker
with the module’s serial number is provided for use with the plug map label according to its plugging
location. If serial number label is not available, then record the serial number of the MCM/Passthrough
module is added, reseated, or replaced along with the number of times plugged. This module is then
allowed three plugs with each plug recorded on label. If the module should need to be removed and
reinstalled a fourth time, it must be replaced.
The process is similar for the L3 module, except a separate serial number label is not provided, instead
the serial number is located on a sticker attached to the L3 heatsink. Record the serial number of the L3
modules added, replaced, and reseated along with the number of times plugged. If the module should
need to be removed and reinstalled a fourth time, it must be replaced.
Chapter 9. Removal and Replacement Procedures
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Summary of Contents for pSeries 670
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