HP 355856-001 manual Installing Memory Modules

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Hardware Upgrades

identical. Therefore, if you have one preinstalled DIMM in socket J23 and are adding a second DIMM, it is recommended that you install an identical DIMM into the J25 socket. If you are populating all four DIMM sockets, use identical DIMMs in each socket. Otherwise, the system will not operate in dual channel mode.

There are two DIMM sockets on the HP Compaq d228 and d230

Microtower system board, operating in single-channel mode.

There are four DIMM sockets on the HP Compaq d248 Microtower system board, operating in either single- or dual-channel mode, with two sockets per channel. The sockets are labeled J23, J24, J25, and J28. Sockets J23 and J24 operate in memory channel A. Sockets J25 and J28 operate in memory channel B.

Installing Memory Modules

ÄCAUTION: The memory module sockets have gold metal contacts. When upgrading the memory, it is important to use memory modules with gold metal contacts to prevent corrosion and/or oxidation resulting from having incompatible metals in contact with each other.

ÄCAUTION: Static electricity can damage the electronic components of the computer or optional cards. Before beginning these procedures, ensure that you are discharged of static electricity by briefly touching a grounded metal object. Refer to Chapter 5 for more information.

ÄCAUTION: When handling a memory module, be careful not to touch any of the contacts. Doing so may damage the module.

1.Turn off the computer properly through the operating system and turn off any external devices.

2.Disconnect the power cord from the power outlet and the computer, and disconnect any external devices.

If there is a hard drive in bay 5 it will be necessary to remove the lower drive cage before removing the memory modules.

3.Remove the right access panel.

Hardware Reference Guide

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Contents Hardware Reference Guide Hardware Reference Guide Contents Electrostatic Discharge Serviceability Features Hardware UpgradesPage Removing the Access Panels Removing the Front Bezel Drive Bezel Blank Removing Front Drive BezelsDiskette Drive Bezel DIMMs Installing Additional MemoryDDR-SDRAM DIMMs Single Channel and Dual Channel Modes Installing Memory Modules Installing a Memory Module Installing an Expansion Card Installing an Expansion Card Replacing or Upgrading a Drive Drive Positions Drive PositionsRemoving a 5.25 Drive Removing a Diskette Drive Removing the Lower Drive Cage Removing the Lower Drive Cage Removing a 3.5 Hard Drive Hardware Upgrades Replacing the Battery Battery ReplacementBattery Replacement Type Inserting a Type 1 Battery Removing a Type 2 Battery Battery Replacement Routine Care Routine Care & Shipping InformationCleaning Optical Disk Drive PrecautionsSafety OperationShipping Preparation Routine Care & Shipping Information Preventing Electrostatic Damage Electrostatic DischargeGrounding Methods Index Index-2