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Independent Loading Mechanism (ILM)
28 Thermal/Mechanical Specifications and Design Guidelines
4.1.2 ILM Back Plate Design Overview
The back plate is a flat steel back plate with pierced and extruded features for ILM
attach. A clearance hole is located at the center of the plate to allow access to test
points and backside capacitors if required. An insulator is pre-applied. A notch is placed
in one corner to assist in orienting the back plate during assembly.
Note: The Server ILM back plate is different from the Desktop design. Since Server
secondary-side clearance of 3.0 mm [0.118 inch] is generally available for leads and
backside components, so Server ILM back plate is designed with 1.8 mm thickness and
2.2 mm entire height including punch protrusion length.
Caution: Intel does NOT recommend using the server back plate for high-volume desktop
applications at this time as the server back plate test conditions cover a limited
envelope. Back plates and screws are similar in appearance. To prevent mixing,
different levels of differentiation between server and desktop back plate and screws
have been implemented.
For ILM back plate, three levels of differentiation have been implemented:
• Unique part numbers, please refer to part numbers listed in Appendix A.
• Desktop ILM back plate to use black lettering for marking versus server ILM back
plate to use yellow lettering for marking.
• Desktop ILM back plate using marking “115XDBP” versus server ILM back plate
using marking “115XSBP”.
Note: When reworking a BGA component or the socket that the heatsink, battery, ILM and
ILM Back Plate are removed prior to rework. The ILM back plate should also be
removed when reworking through hole mounted components in a mini-wave or solder
pot). The maximum temperature for the pre-applied insulator on the ILM is
approximately 106 °C.
Figure 4-1. ILM Assembly with Installed Processor
Fasteners
Load
Lever
Load
Plate
Hinge /
Frame
Assy
Shoulder Screw
Pin 1 Indicator
Fasteners
Load
Lever
Load
Plate
Hinge /
Frame
Assy
Shoulder Screw
Pin 1 Indicator