IBM iSeries 270 Service Manual page 122

Figure 6. Missing buttons.
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6. Verify all four posts on MCM module are snug prior to installing on the backplane. A loosened guide
post can be tightened with a ratchet or wrench until it is snug. Use caution not to damage the
interposer.
7. Perform the following, paying close attention:
a. Grasp the module across the narrow span of the heatsink cap.
b. Align the corner chamfer (flat corner) on the MCM module or the passthrough to match the
outline on the system board.
c. Verify that the guide pins protrude above the connectors.
d. Carefully push the MCM module into the socket and maintain pressure while closing both locking
cams.
8. Loosen the actuation bolt at the rear of the MCM module.
9. Push the actuation bolt in and slide the spring plate assembly to the down position.
10. Use the torque wrench (supplied with the system tool kit) to tighten the actuation bolt. When the
wrench clicks, followed by about 15 degrees of free motion, the bolt is seated.
Attention: Do not over-torque the bolt!
11. Go to Testing MCMs for a short circuit (See page 126) and install the MCM short circuit test tool.
Use the tool during the MCM replacement procedure to ensure that the MCMs are installed without a
short circuit. If you install an MCM and encounter a short circuit, the MCM you installed must be
replaced.
12. Remove the primary Network interface controller (NIC) card. See Models 870 and 890 - Network
interface controller (NIC) card, and replace the VPD card that came with the MCM module.
Figure 7. L3 and MCM cards
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Hardware (Remove and Replace; Part Locations and Listings)