Dell Inspiron 4000 Service Manual page 37

Microprocessor Module
NOTICE: Hold the microprocessor down while turning the cam screw to prevent intermittent contact between the cam screw and the microprocessor.
NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed batteries.
NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by touching an unpainted metal surface on the computer.
NOTICE: Read "Preparing to Work Inside the
1. Remove the hard drive assembly.
2. Turn the computer over and remove the keyboard.
NOTICE: To ensure maximum cooling for the microprocessor, do not touch the heat transfer areas on the thermal cooling assembly. The oils in your skin
reduce the heat transfer capability of the thermal pads.
3. Remove the thermal cooling
NOTICE: When removing the microprocessor module, pull the module straight up. Be careful not to bend the pins on the microprocessor module.
4. Remove the microprocessor module:
NOTICE: To avoid damaging the microprocessor while removing the cam screw, hold the screwdriver so that it is perpendicular to the microprocessor.
a. Use a small flat-head screwdriver and rotate the ZIF socket cam screw 180 degrees to loosen the ZIF socket.
The ZIF socket cam screw secures the microprocessor assembly to the system board assembly. Take note of the arrow on the ZIF socket cam
screw points to the front of the computer when engaged.
b. Use a microprocessor extraction tool to remove the microprocessor module.
Replacing the Microprocessor Module
HINT: To update or reflash the BIOS, see the Dell Portable Computer BIOS Update Guide for instructions.
NOTICE: After replacing the microprocessor module, update the BIOS using a flash BIOS update program floppy disk or CD.
NOTICE: Seating the microprocessor module properly in the ZIF socket does not require force.
NOTICE: A microprocessor module that is not properly seated can result in an intermittent connection or permanent damage to the microprocessor and
ZIF socket.
1. Align the pin-1 corner of the microprocessor module with the pin-1 corner of the microprocessor socket on the system board and insert the
microprocessor module.
NOTICE: You must position the microprocessor module correctly in the ZIF socket to avoid permanent damage to the module and the socket.
When the microprocessor module is correctly seated, all four corners are aligned to the same height. If one or more corners of the module are higher
than the others, the module is not seated correctly.
NOTICE: Hold the microprocessor down while turning the cam screw to prevent intermittent contact between the cam screw and microprocessor.
2. Tighten the ZIF socket cam screw to secure the microprocessor module to the system board assembly.
Computer" before performing the following procedure.
assembly.