DEC DECstation 5000 Model 100 Series Hardware Operator's Manual page 75

Find the CPU module inside the system unit, as shown in
9.
Figure 5-12, on page 5-21.
With one hand, pull up carefully on a corner of the CPU
10.
module where there is a mounting post. With the other
hand, use your fingernails to press the lock at the top of the
mounting post into the post until you can pull the module
free of the lock. Do not lift the module completely off the
mounting post.
Use the same procedure to pull the module free of the lock
11.
on the other two mounting posts.
Caution:
module if you do.
Pull the other end of the module completely out of the
12.
module connector. Then remove the CPU module from the
system unit.
Set the CPU module aside carefully. Put it in an antistatic
13.
bag, if you have one, or use the bag from the new CPU
module after you unpack it.
5–20 Internal Hardware Options
Do not pull the heat sinks. You can damage the CPU