IBM pSeries 670 Service Manual page 824

Attention: Each time an MCM module is removed from system backplane, the LGA site where the
module connects must be cleaned. With the brush supplied with the replacement kit, use only
downward strokes, starting in the upper-left location. Using firm pressure, brush left to right, top to
bottom, using overlapping strokes as shown in the following illustration.
The brush must be discarded after cleaning only one LGA site.
22. Each time an MCM module (or pass through) is installed, the associated interposer must be
inspected. Inspect the MCM (or pass through) interposer, using a magnifying glass (part number
11P4747). If either of the following conditions occur, the interposer is not acceptable and the module
must be returned:
Shorts If the button, a loop of the button wire, or an individual button wire lead extends more
than three times the width of the wire outside of a connector hole chamfer (top side)
or counter bore pin indent (bottom side).
Missing buttons
23. Record on the system log sheet on the system the date that this MCM has been removed.
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