IBM pSeries 690 Service Manual page 867

8. Beginning with the upper most module to be removed, loosen the two captive heatsink bushing
screws until they are free floating. See the following illustration for heatsink bushing screw locations.
9. Insert the two steel alignment rods through the MCM alignment holes and into the aluminum stiffener.
See the following illustration for MCM clearance hole locations.
1 Aluminum Backplane Stiffener
2 Steel Alignment Rods
3 MCM (with copper heatsink)
10. Ensure that the locking cams at the front of the MCM module are engaged with the module. To adjust
the locking cams, use a 5-mm socket wrench for systems containing the aluminum backplane
stiffener and an 8-mm socket wrench for systems containing the plastic backplane stiffener.
11. Remove DCA books and blanks 2 through 6, as well as both capacitor books. See "Processor
Subsystem DCA (Distributed Converter Assembly) Books and DCA Blanks" on page 843 and
"Capacitor Books and Blanks" on page 844.
4 MCM Alignment Hole (quantity 2) (on
MCM with copper heatsink only)
5 Captive Heatsink Bushing Screw
6 Locking Cam
Chapter 9. Removal and Replacement Procedures
847