Specifications

17 January 1997 – Subject to Change

Upgrading the AlphaPC 164 5–5

Increasing Microprocessor Speed

5.3.2 Required Tools

The following tools are required when replacing the microprocessor chip:

A TS30 manual nut/torque driver (or equivalent) with the following attachments is

required to affix the heat sink and fan to the microprocessor’s IPGA package:

•

1/4-inch hex bit

•

7/16-inch socket with 1/4-inch hex drive

•

#2 Phillips-head screwdriver bit

5.3.3 Removing the 21164 Microprocessor

Remove the microprocessor currently in place at location U21 by performing the

following steps:

1. Unplug the fan power/sensor cable from connector J21 (see Figure 2–1).

2. Remove the four 6-32

0.875-inch screws that secure the fan and fan guard to

the heat sink.

3. Remove the fan and fan guard.

4. If the sink/chip/fan clip is used, remove it by unhooking its ends from around the

ZIF socket retainers.

5. Using a 7/16-inch socket, remove the two nuts securing the heat sink to the

microprocessor studs.

6. Remove the heat sink by gently lifting it off the microprocessor.

7. Remove and discard the GRAFOIL heat conduction pad.

8. Thoroughly clean the bottom surface of the heat sink before affixing it to the

new microprocessor.

9. Lift the ZIF socket actuator handle to a full 90° angle.

10. Remove the microprocessor chip by lifting it straight out of the socket.

5.3.4 Installing the 21164 Microprocessor

Install the new microprocessor in location U21 by performing the following steps:

Note:

Install the heat sink only after the microprocessor has been assembled to

the ZIF socket.

1. Observe antistatic precautions.