60 Installation and Service Guide: Printer Controller EB-34
Replacing Parts
9 Open the load plate (see Figure 24).
Figure 24: Removing/replacing the CPU
10 Grasp the CPU by its edges, lift it out of the socket, and then place the CPU in a safe place.
Note: If you remove the CPU from the motherboard to install it on a new motherboard, unpack the new motherboard
and remove the protective plastic cover from the CPU socket. Transfer the protective cover to the CPU socket of the
old motherboard to protect the circuitry.
To replace a CPU
1 Do one of the following:
• If you are installing a new CPU cooling assembly on an existing CPU, clean the contact surface of the CPU to
remove any old thermal compound residue. A thermal pad is preinstalled on the underside of the new CPU
cooling assembly.
• If you are installing the existing CPU and CPU cooling assembly on a new motherboard, clean the contact
surfaces of the CPU and cooling assembly as described above. Then apply fresh thermal compound to the
contact surface of the CPU using the applicator provided with the new motherboard.
2 Prepare the CPU socket by ensuring that:
• The socket lever is in the open position.
• The load plate is open.
1 Socket lever in the locked position 4 CPU
2 Socket lever in the open position 5 Flat corner of socket border
3 Yellow triangle 6 Load plate open
Important: Be sure to remove all thermal compound residue from the surface of the CPU. It may help to
scrape all the residue off the surface using the flat edge of a non-conductive tool. Then use a lint-free cloth
moistened with alcohol to clean the surface.
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