Lenovo 9640, 9638, 9643, 9644, 9645, TC A55-9636 Erasing a lost or forgotten password clearing Cmos

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Refer to “Lithium battery notice” on page xii for information about replacing and disposing of the battery.

To change the battery:

1.Turn off the computer and disconnect the power cord from the electrical outlet and from the computer.

2.Open the computer cover. See “Opening the cover” on page 20.

3.Access the system board. See “Accessing system board components and drives” on page 22.

4.Locate the battery. See “Identifying parts on the system board” on page 23.

5.Remove the old battery.

6.Install the new battery.

7.Reinstall the PCI riser assembly if removed.

8.Close the computer cover, and connect the cables. See “Closing the cover and connecting the cables” on page 35.

Note: When the computer is turned on for the first time after battery replacement, an error message might be displayed. This is normal after replacing the battery.

9.Turn on the computer and all attached devices.

10.Use the Setup Utility program to set the date and time and any passwords. See Chapter 5, “Using the Setup Utility,” on page 45.

Erasing a lost or forgotten password (clearing CMOS)

This section applies to lost or forgotten passwords. For more information about lost or forgotten passwords, go to the ThinkVantage Productivity Center program.

To erase a forgotten password:

1.Open the computer cover. See“Opening the cover” on page 20.

2.Access the system board. See “Accessing system board components and drives” on page 22.

3.Locate the Clear CMOS/Recovery jumper on the system board. See “Identifying parts on the system board” on page 23.

4.Move the jumper from the standard position (pins 1 and 2) to the maintenance or configure position (pins 2 and 3).

5.Reinstall the PCI riser assembly if removed.

6.Lower the drive bay assembly and reconnect any cables that were disconnected.

34User Guide

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Contents Page Page Page Page Contents Appendix A. Manual modem Important safety information Conditions that require immediate actionGeneral safety guidelines Service and upgradesStatic electricity prevention Power cords and power adapters Voltage-selection switchExtension cords and related devices Plugs and outletsExternal devices BatteriesHeat and product ventilation Electrical current safety information Operating environmentModem safety information Lithium battery noticeTo connect To disconnect Power supply statement Laser compliance statementCleaning and maintenance Data safetyAdditional safety information Introduction Xvi User Guide Comfort Arranging your workspaceGlare and lighting Air circulation Electrical outlets and cable lengthsSetting up your computer Connecting your computerUser Guide Setting up your computer User Guide 1394 Finishing the software installation Turning on powerCompleting important tasks Installing other operating systems Updating your operating systemUpdating your antivirus software Shutting down the computerUser Guide Installing options FeaturesMemory Expansion Available options Specifications DimensionsWeight EnvironmentTools required Supported operating positionsHandling static-sensitive devices Installing external options Locating connectors on the rear of your computer Connector Description Obtaining device driversOpening the cover Locating components Accessing system board components and drives Bios WP Identifying parts on the system boardInstalling memory Installing PCI adapters What to do nextInstalling internal drives Drive specifications Installing a drive in bay Connecting a serial ATA drive Installing a diskette drive in bay Installing options Security features Integrated cable lock Password protection Changing the batteryErasing a lost or forgotten password clearing Cmos Closing the cover and connecting the cables User Guide Recovering software Creating and using the Product Recovery discPerforming backup and recovery operations Using the Rescue and Recovery workspace Creating and using rescue media Creating and using a Recovery Repair diskette To create rescue media, do the followingRecovering or installing device drivers Setting a rescue device in the startup sequence Solving recovery problemsUser Guide Using the Setup Utility Starting the Setup Utility programViewing and changing settings Using passwordsUser Password Administrator PasswordSetting, changing, and deleting a password Using Security Profile by DeviceSelecting a temporary startup device Selecting a startup deviceChanging the startup device sequence Advanced settings Exiting from the Setup Utility programUpdating flashing Bios from a diskette or CD-ROM Using system programsUpdating system programs Updating flashing Bios from your operating system Recovering from a POST/BIOS update failureUpdating system programs User Guide Basic troubleshooting Troubleshooting and diagnosticsSymptom Action Diagnostic programs PC-Doctor for Windows PC-Doctor for DOSCreating diagnostic diskettes PC-Doctor for Windows PE Cleaning the mouseOptical mouse Non-optical mouse Troubleshooting and diagnostics User Guide Getting information, help, and service Information resourcesOnline Books folder ThinkVantage Productivity CenterSafety and Warranty Access HelpHelp and service Using the documentation and diagnostic programs Calling for serviceUsing other services Purchasing additional servicesAppendix A. Manual modem commands Basic AT commandsLow speaker volume Set Pulse dial as defaultSet Tone Dial as default Internal speaker on until carrier detectedExtended AT commands MNP/V.42/V.42bis/V.44 commands Fax Class 1 commands Fax Class 2 commandsVoice commands Appendix A. Manual modem commands User Guide Appendix B. Notices Television output notice TrademarksIndex Page Page Part Number 42Y4610
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TC A55-9636, 9640, 9645, 9644, 9643 specifications

Lenovo has consistently been at the forefront of innovation in the computing world, with a range of laptops and desktops that cater to a variety of needs and preferences. Among their popular offerings are the Lenovo 9640, 9643, TC A55-9636, 9644, and 9645. Each of these models is designed to provide exceptional performance, reliability, and user-friendly experience, making them appealing choices for both personal and business use.

The Lenovo 9640 is renowned for its sleek design and powerful performance. This model is equipped with the latest Intel processors, ensuring smooth multitasking and efficient power consumption. It features a vibrant display that provides excellent color accuracy and vivid visuals, making it ideal for content creators and casual users alike. With ample storage options and high-speed SSD configurations, users can expect fast boot times and quick file access.

Similarly, the Lenovo 9643 builds on this legacy, offering enhanced graphics capabilities with dedicated GPU options. This feature is particularly beneficial for gamers and professionals who rely on graphical performance for tasks such as video editing or 3D modeling. The 9643 also emphasizes connectivity, providing a range of ports, including USB-C, HDMI, and Ethernet, ensuring users can easily connect to peripherals and networks.

The TC A55-9636 is Lenovo's entry into the compact desktop market, designed for users seeking a powerful, space-saving solution. With its robust performance metrics and energy-efficient components, the A55-9636 is perfect for both home and office environments. It supports a variety of multitasking scenarios, making it suitable for productivity-driven tasks, while its expandable architecture means users can upgrade components as their needs evolve.

The Lenovo 9644 and 9645 round out this impressive lineup with their focus on business-centric features. These models provide enhanced security options, including fingerprint readers and TPM chips, catering to enterprises that prioritize data protection. With long battery life and solid build quality, both models promise durability and reliability, critical for professionals who are always on the go.

All models in this series showcase Lenovo's commitment to sustainability, incorporating eco-friendly materials and energy-efficient technologies. The user-friendly interfaces across the devices ensure a seamless experience, meeting the demands of a broad user base from students to business executives. In summary, the Lenovo 9640, 9643, TC A55-9636, 9644, and 9645 represent a versatile range of computing solutions that combine cutting-edge technology with efficiency, ensuring users can achieve their goals effectively and stylishly.
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