NCR 7458 - Manual (Page 56)

3-32 Chapter 3: Hardware Service
Replacing the CPU
CPU replacement kits include a CPU and a Heat Sink and Fan
Assembly. To replace these parts, use the following procedure.
1. Slide the Electronics Tray out of the terminal cabinet.
2. Locate the CPU (refer to Motherboard illustration earlier in this
section).
3. Remove any components that may obstruct removal of the CPU.
4. Unplug the Fan Harness.
5. Unhook the Heat Sink and Fan Assembly by pushing down on the
Retaining Clip and pivoting the clip away from the socket.
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Retaining Clip
6. Remove the Heat Sink and Fan Assembly.