Lenovo 7539, 7548, 104, 154 manual Removing the power supply assembly

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Figure 23. Removing the heat sink fan duct

5.Disconnect the power supply assembly cables from all drives and from the 24-pin power connector and 4-pin power connector on the system board. See “Locating parts on the system board” on page 9.

Note: You might also need to release the power supply assembly cables from some cable clips or ties that secure the cables to the chassis. Make sure that you note the cable routing before disconnecting the cables.

6.At the rear of the computer, remove the three screws that secure the power supply assembly. Press the power supply clip 1 downward to release the power supply assembly and then slide the power supply assembly to the front of the computer. Lift the power supply assembly out of the computer.

Figure 24. Removing the power supply assembly

7.Make sure that the new power supply assembly is the correct replacement. Some power supply assemblies automatically sense the voltage or accept universal input, some power supply assemblies are voltage specific, and some power supply assemblies have a voltage-selection switch. If your power supply assembly has a voltage-selection switch, make sure that you set the voltage-selection switch to match the voltage available at your electrical outlet. If necessary, use a ballpoint pen to slide the voltage-selection switch to the correct position.

•If the voltage supply range in your local country or region is 100–127 V ac, set the voltage-selection switch to 115 V.

•If the voltage supply range in your local country or region is 200–240 V ac, set the voltage-selection switch to 230 V.

30ThinkCentre User Guide

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Contents ThinkCentre User Guide Page ThinkCentre User Guide First Edition November Copyright Lenovo Contents Appendix A. Notices Important safety information Vi ThinkCentre User Guide Features Product overviewConnectivity Specifications Security featuresSoftware overview Software provided with your Windows operating systemLenovo ThinkVantage Tools Locations Lenovo ThinkVantage ToolboxLocating connectors and parts on the rear of your computer Rear connector and part locationsConnector Description Locating componentsLocating parts on the system board Component locationsLocating internal drives System board part locationsDrive bay locations ThinkCentre User Guide Installing external options Installing or replacing hardwareInstalling or replacing hardware Handling static-sensitive devicesRemoving the computer cover Removing the computer coverRemoving and reinstalling the front bezel Removing the front bezelAccessing the system board components and drives Reinstalling the front bezelInstalling or replacing a PCI card Pivoting the drive bay assembly upwardThinkCentre User Guide Removing the PCI card Installing or replacing a memory module What to do nextRemoving the memory module Replacing the battery Installing the memory moduleReplacing the heat sink and fan assembly Removing the old batteryRemoving the heat sink fan duct Screws that secure the heat sink and fan assembly Installing the heat sink fan duct Replacing the microprocessorAccessing the microprocessor Replacing the power supply assembly Removing the microprocessorInstalling or replacing hardware Removing the power supply assembly Installing the power supply assembly Replacing the optical drive Removing the optical drive screws Slide the optical drive out of the front of the computer Installing the optical drive Replacing the hard disk drivePivoting the drive bay assembly Removing the hard disk drive Installing the hard disk drive Replacing the card readerReplacing the front fan assembly Removing the card readerRemoving the front fan assembly Installing the front fan assembly Replacing the keyboardKeyboard connectors Replacing the mouseCompleting the parts replacement Mouse connectorsObtaining device drivers Basic security features Reinstalling the computer coverInstalling an integrated cable lock Integrated cable lockPadlock Password protectionErasing a lost or forgotten password clearing Cmos Installing or replacing hardware ThinkCentre User Guide Creating recovery media Recovery informationCreating and using recovery media Performing a backup operation Using recovery mediaPerforming backup and recovery operations Performing a recovery operation Using the Rescue and Recovery workspaceCreating a rescue medium Creating and using a rescue mediumUsing a rescue medium Installing or reinstalling device drivers Solving recovery problemsThinkCentre User Guide Viewing or changing settings Using the Setup Utility programStarting the Setup Utility program Using passwordsAdministrator password Password considerationsPower-on password Setting, changing, or deleting a passwordViewing or changing the startup device sequence Selecting a startup deviceSelecting a temporary startup device Exiting the Setup Utility program Updating system programs Using system programsUpdating flashing the Bios from a disc Updating flashing the Bios from your operating system Recovering from a Post and Bios update failureUpdating system programs ThinkCentre User Guide Troubleshooting and diagnostic programs Basic troubleshootingPC-Doctor for DOS Diagnostic programsLenovo ThinkVantage Toolbox Cleaning an optical mouse Running the diagnostic program from the diagnostic discThinkCentre User Guide Online Books folder Getting information, help, and serviceInformation resources Lenovo ThinkVantage ToolsHelp and service Access HelpSafety and warranty Lenovo WelcomeUsing the documentation and diagnostic programs Calling for serviceUsing other services Purchasing additional servicesAppendix A. Notices Television output notice European conformance CE mark TrademarksIndex CRUKeyboard replacing Lenovo Customer Support Center Solving recovery problems Starting the Setup Utility program ThinkCentre User Guide Page 0A22638

7539, 154, 7548, 104 specifications

Lenovo is known for its innovative technology and cutting-edge devices, and the model 104,7548,154,7539 is no exception. This device integrates a range of features designed to enhance user experience and productivity. One of the standout features is its powerful processing capability, leveraging advanced Intel or AMD processors that ensure seamless multitasking and performance during demanding applications.

The display of the Lenovo model 104,7548,154,7539 is another highlight. It boasts a high-resolution screen, offering crisp visuals and vibrant colors that make it suitable for everything from graphic design to casual media consumption. The device's display often includes features like anti-glare technology, which enhances usability in various lighting conditions.

In terms of connectivity, this model excels with a variety of ports, including USB-C, HDMI, and traditional USB ports, allowing users to connect a wide range of peripherals and external displays. Wireless connectivity is also robust, featuring the latest Wi-Fi standards for fast and stable internet access, along with Bluetooth capabilities for connecting wireless accessories.

Storage solutions are vital, and Lenovo has equipped the model 104,7548,154,7539 with ample SSD options. Solid-state drives provide faster boot times, quicker file access, and increased durability compared to traditional hard drives. With customizable storage capacities, users can choose a setup that meets their specific needs.

Battery life is a crucial aspect of portable devices, and this Lenovo model does not disappoint. With an efficient power management system, users can work for extended periods without needing to recharge, making it an ideal choice for professionals on the go or students attending classes.

Security features are taken seriously in the Lenovo model 104,7548,154,7539. With options such as biometric fingerprint readers and facial recognition technologies, users can rest assured that their data remains secure. Additionally, Lenovo’s robust software suite typically includes tools for data protection and privacy.

Lastly, the design of the device is user-friendly, combining functionality with aesthetics. It features a comfortable keyboard with excellent key travel for efficient typing and has a sleek, modern appearance that appeals to a wide audience. Whether for business, creative, or personal use, the Lenovo model 104,7548,154,7539 stands out as a versatile and powerful option in the competitive tech landscape.
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