Installing memory | Lenovo TC A51-8425, TC A51-8424, TC A51-8428

Installing memory

Your computer has two connectors for installing dual inline memory modules (DIMMs) that provide up to a maximum of 2 GB of system memory.

When installing memory, the following rules apply:

vUse 2.5 V, 184-pin, double data rate synchronous dynamic random access memory (DDR SDRAM), non-ECC DIMMs.

vUse 128 MB, 256 MB, 512 MB, or 1 GB DIMMs (when available) in any combination.

Note: Only DDR SDRAM DIMMs can be used.

To install DIMMs:

1.Access the system board. See “Accessing system board components and drives” on page 14.

2.Locate the DIMM connectors. See “Identifying parts on the system board” on page 15.

3.Open the retaining clips.

4.Make sure the notch in the DIMM aligns with the tab on the connector. Push or insert the memory module straight down into the connector until the retaining clips close.

5.Replace the PCI riser and adapters if it was removed.

6.Place the drives back to the original position.

7.Replace the cover. See “Closing the cover and connecting the cables” on page 24.

16User Guide

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Lenovo TC A51-8425, TC A51-8424, TC A51-8428, TC S51-8171, TC S51-8173, TC S51-8172 manual Installing memory

Contents

User Guide Types 8424, 8425 Types 8171, 8172 Page User Guide Types 8424, 8425 Types 8171, 8172 Page Contents Iv User Guide Important safety information Conditions that require immediate action General safety guidelines ServicePower cords and power adapters Extension cords and related devices Plugs and outletsBatteries CD and DVD drive safety Additional safety informationHeat and product ventilation To connect To disconnect Lithium battery notice Modem safety informationConnexion Déconnexion Laser compliance statement Consignes de sécurité relatives au modem Xii User Guide Overview Information resources Features Security features Input/output featuresPower Expansion IBM preinstalled software Operating systems preinstalled varies by model Available options Specifications Supported operating positions User Guide Installing options Installing external optionsHandling static-sensitive devices Cover keylock some models Locating connectors on the rear of your computer Obtaining device drivers Opening the cover Locating components Accessing system board components and drives Identifying parts on the system board Installing memory Installing PCI adapters Removing and replacing the battery What to do next Removing and replacing an optical drive Installing security features Removing and replacing a diskette drive Identifying security locks Integrated security cable User Guide Rope clip Password protectionTo install a rope clip Cover lock Erasing a lost or forgotten password clearing Cmos Closing the cover and connecting the cables Viewing and changing settings Using the IBM Setup UtilityStarting the IBM Setup Utility program Exiting from the IBM Setup Utility program Administrator Password Password considerationsUser Password IDE Drive User Password Using Security Profile by Device IDE Drive Master PasswordSetting, changing, and deleting a password Select Security Profile by Device Selecting a temporary startup device Advanced settingsSelecting a startup device Changing the startup device sequence Appendix A. Updating POST/BIOS Updating flashing Bios from a disketteUpdating flashing Bios from your operating system Recovering from a POST/BIOS update failure Appendix B. Cleaning the mouse Cleaning an optical mouseCleaning a mouse with a ball User Guide Appendix C. Manual modem commands Basic AT commands Set Tone Dial as default Low speaker volumeSet Pulse dial as default Internal speaker on until carrier detected Extended AT commands MNP/V.42/V.42bis/V.44 commands Fax Class 1 commands Fax Class 2 commands Voice commands Appendix C. Manual modem commands User Guide Appendix D. Notices Trademarks IBM Index Special characters Page Page Part Number 19R0474