Module Latch Assemblies

plungers (2}

module latch assembl ies ( 2)

springs (2}

plungers (2}

module latch assembl ies ( 2)

springs (2}

location of / snap tabs (2)

bottom case assembly module latches (2)

Figure 16. Module Latch Assemblies Removal location of / snap tabs (2)

bottom case assembly module latches (2)

Figure 16. Module Latch Assemblies Removal

CAUTION: To avoid damaging the system board, you must remove the main battery before you service the computer.

1. Remove the main battery and remove the device from the modular bay.

2. Remove the keyboard assembly.

3. Remove the display assembly.

4. Remove the palmrest assembly.

5. Remove the left latch from the outside of the bottom case assembly by carefully squeezing the snap tabs to unsnap the module latch assembly.

Keep pressure applied to the module latch assembly while unsnapping the snap tabs to prevent the module latch assembly from coming loose from the case. If the module latch assembly does come loose from the case:

a. Carefully reinsert the spring onto the plunger on the module latch, and reinstall the module latch assembly into the holding features on the inside of the case.

b. Ensure that the plunger is inserted in its respective hole, that the side of the latch with the two bumps is facing the back of the case, and that the surface with the wear ribs is facing the bottom of the case (see Figure 17).

6. Snap in the new latch from the bottom of the base, making certain its snap features are fully engaged on the inside of the case.

7. Ensure that the newly installed latch moves smoothly and freely when pushed and released.

8. Repeat steps 1 through 3 for the latch on the right side.

Figure 17. Left Slider

System Board Assembly

The system board's basic input/output system (BIOS) chip contains the system service tag number, which is also visible on a bar-code label on the bottom of the computer. The replacement kit for the system board assembly includes a diskette that provides a utility for transferring the service tag number to the replacement system board assembly.

CAUTION: To avoid damaging the system board, you must remove the main battery before you service the computer.

1. Remove the keyboard assembly.

2. Remove the display assembly.

3. Remove the palmrest assembly.

CAUTION: 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.

Figure 19. Microprocessor Module

4. Remove the two 4-mm screws securing the thermal cooling assembly to the microprocessor module (see Figure 19).

5. Loosen the three captive screws securing the microprocessor shield to the microprocessor module.

6. Remove the microprocessor shield.

7. Rotate the arm of the thermal cooling assembly up and away from the microprocessor module.

CAUTION: Pull the module straight up. Do not move the tool from side to side to extract the processor board.

8. Use a microprocessor extractor tool to remove the microprocessor module.

The tool fits on the left side of the module aligned with white marks on the front and back edge of the processor board (see Figure 19).

9. Remove any PC Cards or plastic blanks from the PC Card slot.

10. Verify that the PC Card ejectors do not extend from the PC Card slot.

11. Remove the following two screws from the system board assembly (see Figure 18):

• The 4-mm screw with captive washer located on the far left side of the computer between the hard-disk drive assembly and the PC Card slot.

• The 4-mm screw with captive washer located on the far right side of the computer in front of the TCA and to the right of the microprocessor module.

NOTE: Locate these screws by looking for the white circles on the system board that outline the captive washers.

12. Lift the system board assembly out of the bottom case assembly.

Be sure to transfer the memory module(s) to the replacement system board assembly.

After replacing the system board assembly be sure to enter the system's service tag number into the BIOS of the replacement system board assembly. Insert the diskette that accompanied the replacement system board assembly into the diskette drive, and turn on the computer. Follow the instructions on the display screen.

When you reinstall the microprocessor module in the system board, make sure to align the microprocessor connector on the left side of the board and press down to insert the module connector. When the microprocessor module is seated, all four corners must be at the same height. If one or more corners of the module are higher than the others, the module is not seated correctly. Rotate the arm of the thermal cooling assembly into place and replace the microprocessor shield. Tighten the three captive screws on the corners of the shield to secure the microprocessor module and shield. Replace the two 4-mm screws that secure the thermal cooling assembly arm and shield to the microprocessor module.

Figure 20. Thermal Cooling Assembly Removal thermal cooling assembly and exhaust fan

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