Page 1 ThinkCentre Hardware Maintenance Manual Machine Types: 2119, 2121, 2697, 2698, 2742, 2750, 2756, 2800, 2929, 2932, 2934, 2935, 2941, 2943, 2945, 2960, 2961, 2967, 2982, 2986, 2988, 2992, 2993, 2994, 2996, 2999, 3181, 3182, 3183, 3184, 3185, 3186, 3187, 3190, 3198, 3201, 3202, 3204, 3207, 3208, 3209, 3212, 3214, 3217, 3218,3220, 3224, 3226, 3227, 3228, 3229, 3234, 3235, 3236, 3237, 3238, 3240, 3242, 3243, 3302, 3306, 3391, 3392, 3393, and 3395...
Page 2 “Safety information” on page 3 and Appendix A “Notices” on page 269. First Edition (May 2012) © Copyright Lenovo 2012. LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant a General Services Administration “GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS-35F-05925.
Page 3: Table Of Contents
Viewing and changing settings ..Lenovo Welcome....Using passwords....
Page 4 Locating connectors on the rear of your Replacing the rear fan assembly ..computer ....Replacing the front audio and USB Locating major FRUs and CRUs .
Page 6 ThinkCentre Hardware Maintenance Manual...
Page 7: Chapter 1. About This Manual
This manual is intended only for trained service personnel who are familiar with Lenovo computer products. Before servicing a Lenovo computer product, be sure to read Chapter 2 “Safety information” on page 3. Chapter 7 “Symptom-to-FRU index” on page 65 and Chapter 12 “Additional service information” on page 265 are not specific to any machine type.
Page 8 ThinkCentre Hardware Maintenance Manual...
Page 10 Important: Use only approved tools and test equipment. Some hand tools have handles covered with a soft material that does not insulate you when working with live electrical currents. Many customers have, near their equipment, rubber floor mats that contain small conductive fibers to decrease electrostatic discharges. Do not use this type of mat to protect yourself from an electric shock.
Page 11: Voltage-Selection Switch
Voltage-selection switch Some computers are equipped with a voltage-selection switch located near the power-cord connection point on the computer. If your computer has a voltage-selection switch, ensure that you set the switch to match the voltage available at your electrical outlet. Setting the voltage-selection switch incorrectly can cause permanent damage to the computer.
Page 12: Handling Electrostatic Discharge-Sensitive Devices
5. Check for any obvious alterations. Use good judgment as to the safety of any alterations. 6. Check inside the unit for any obvious unsafe conditions, such as metal filings, contamination, water or other liquids, or signs of fire or smoke damage. 7.
Page 13 • French • German • Hebrew • Italian • Korean • Spanish DANGER Electrical current from power, telephone and communication cables is hazardous. To avoid a shock hazard: • Do not connect or disconnect any cables or perform installation, maintenance, or reconfiguration of this product during an electrical storm.
Page 14 CAUTION: When laser products (such as CD-ROMs, DVD-ROM drives, fiber optic devices, or transmitters) are installed, note the following: • Do not remove the covers. Removing the covers of the laser product could result in exposure to hazardous laser radiation. There are no serviceable parts inside the device. •...
Page 15 Chapter 2 Safety information...
Page 16 ≥18 kg (37 lb) ≥32 kg (70.5 lb) ≥55 kg (121.2 lb) ThinkCentre Hardware Maintenance Manual...
Page 17 PERIGO A corrente elétrica proveniente de cabos de alimentação, de telefone e de comunicações é perigosa. Para evitar risco de choque elétrico: • Não conecte nem desconecte nenhum cabo ou execute instalação, manutenção ou reconfiguração deste produto durante uma tempestade com raios. •...
Page 18 CUIDADO: Ao substituir a bateria de lítio, utilize apenas uma bateria com Número de Peça 45C1566 ou um tipo de bateria equivalente recomendado pelo Se o seu sistema possui um módulo com uma bateria de lítio, substitua-o apenas por um módulo do mesmo tipo e do mesmo fabricante. A bateria contém lítio e pode explodir se não for utilizada, manuseada ou descartada de maneira correta.
Page 19 CUIDADO: O botão de controle de alimentação do dispositivo e o botão para ligar/desligar da fonte de alimentação não desligam a corrente elétrica fornecida ao dispositivo. O dispositivo também pode ter mais de um cabo de alimentação. Para remover toda a corrente elétrica do dispositivo, assegure que todos os cabos de alimentação estejam desconectados da fonte de alimentação.
Page 20 ThinkCentre Hardware Maintenance Manual...
Page 21 Chapter 2 Safety information...
Page 22 ThinkCentre Hardware Maintenance Manual...
Page 23 DANGER Le courant électrique provenant de l'alimentation, du téléphone et des câbles de transmission peut présenter un danger. Pour éviter tout risque de choc électrique : • Ne manipulez aucun câble et n'effectuez aucune opération d'installation, d'entretien ou de reconfiguration de ce produit au cours d'un orage.
Page 24 ATTENTION: Remplacer la pile au lithium usagée par une pile de référence identique exclusivement, (référence 45C1566), ou suivre les instructions du fabricant qui en définit les équivalences. Si votre système est doté d'un module contenant une pile au lithium, vous devez le remplacer uniquement par un module identique, produit par le même fabricant.
Page 25 ≥18 kg (37 lb) ≥32 kg (70.5 lb) ≥55 kg (121.2 lb) ATTENTION: Soulevez la machine avec précaution. ATTENTION: L'interrupteur de contrôle d'alimentation de l'unité et l'interrupteur dubloc d'alimentation ne coupent pas le courant électrique alimentantl'unité. En outre, le système peut être équipé de plusieurs cordonsd'alimentation.
Page 26 VORSICHT An Netz-, Telefon- und Datenleitungen können gefährliche Spannungen anliegen. Aus Sicherheitsgründen: • Bei Gewitter an diesem Gerät keine Kabel anschließen oder lösen. Ferner keine Installations-, Wartungs- oder Rekonfigurationsarbeiten durchführen. • Gerät nur an eine Schutzkontaktsteckdose mit ordnungsgemäß geerdetem Schutzkontakt anschließen.
Page 27 ACHTUNG: Bei der Installation von Lasergeräten (wie CD-ROM-Laufwerken, DVD- aufwerken, Einheiten mit Lichtwellenleitertechnik oder Sendern) Folgendes beachten: • Die Abdeckungen nicht entfernen. Durch Entfernen der Abdeckungen des Lasergeräts können gefährliche Laserstrahlungen freigesetzt werden. Das Gerät enthält keine zu wartenden Teile. •...
Page 28 ThinkCentre Hardware Maintenance Manual...
Page 29 Chapter 2 Safety information...
Page 30 PERICOLO La corrente elettrica proveniente dai cavi di alimentazione, del telefono e di comunicazione può essere pericolosa. Per evitare il rischio di scosse elettriche: • Non collegare o scollegare qualsiasi cavo oppure effettuare l'installazione, la manutenzione o la riconfigurazione del prodotto durante un temporale. •...
Page 31 ATTENZIONE: Quando si sostituisce la batteria al litio, utilizzare solo il Numero parte 45C1566 o un tipo di batteria equivalente consigliato dal produttore. Se sul sistema è presente un modulo che contiene una batteria al litio, sostituirlo solo con un tipo di modulo dello stesso tipo della stessa casa di produzione. La batteria contiene litio e può...
Page 32 ≥18 kg (37 lb) ≥32 kg (70.5 lb) ≥55 kg (121.2 lb) ATTENZIONE: Prestare attenzione nel sollevare l'apparecchiatura. ATTENZIONE: Il pulsante di controllo dell'alimentazione presente sull'unità e l'interruttore dell'alimentatore non disattivano l'alimentazione corrente fornita all'unità. E' possibile che l'unità disponga di più cavi di alimentazione.
Page 33 Chapter 2 Safety information...
Page 34 ThinkCentre Hardware Maintenance Manual...
Page 35 PELIGRO La corriente eléctrica procedente de cables de alimentación, teléfonos y cables de comunicación puede ser peligrosa. Para evitar el riesgo de descarga eléctrica: • No conecte ni desconecte los cables ni realice ninguna tarea de instalación, mantenimiento o reconfiguración de este producto durante una tormenta eléctrica. •...
Page 36 PRECAUCIÓN: Cuando haya productos láser (como unidades de CD-ROM, unidades de DVD, dispositivos de fibra óptica o transmisores) instalados, tenga en cuenta lo siguiente: • No quite las cubiertas. Si quita las cubiertas del producto láser, podría quedar expuesto a radiación láser peligrosa.
Page 37 PRECAUCIÓN: El botón de control de alimentación del dispositivo y el interruptor de alimentación de la fuente de alimentación no desconectan la corriente eléctrica suministrada al dispositivo. Además, el dispositivo podría tener más de un cable de alimentación. Para suprimir toda la corriente eléctrica del dispositivo, asegúrese de que todos los cables de alimentación estén desconectados de la toma de corriente.
Page 38 ThinkCentre Hardware Maintenance Manual...
Page 39: Chapter 3. General Information
To access the Lenovo ThinkVantage Tools program, click Start ➙ All Programs ➙ Lenovo ThinkVantage Tools. The following table lists the programs that you can access from the Lenovo ThinkVantage Tools program. To access a program, double-click the corresponding icon.
Page 40: Simpletap
See “Lenovo Solution Center” on page 58 for detailed information. SimpleTap The SimpleTap program provides you with a quick way to customize some basic computer settings such as muting the speakers, adjusting the volume, locking the computer operating system, launching a program, opening a Web page, opening a file, and so on.
Page 41: For Machine Types: 2697, 2698, 2742, 2750
For machine types: 2697, 2698, 2742, 2750, 2935, 2943, 2960, 2967, 2986, 2992, 2994, 2999, 3182, 3184, 3186, 3190, 3201, 3204, 3208, 3212, 3217, 3220, 3226, 3228, 3302, 3391, and 3392 Dimensions Width: 175 mm (6.89 inches) Height: 414 mm (16.30 inches) Depth: 442 mm (17.40 inches) Weight Maximum configuration as shipped: 11 kg (24.25 lb)
Page 42 • Air temperature: Operating: 10°C to 35°C (50°F to 95°F) Storage: -40°C to 60°C (-40°F to 140°F) in original shipping package Storage: -10°C to 60°C (14°F to 140°F) without package • Humidity: Operating: 20% to 80% (non-condensing) Storage: 20% to 90% (non-condensing) •...
Page 43: For Machine Types: 2119, 2121, 3229, 3234
For machine types: 2119, 2121, 3229, 3234, 3235, 3236, 3237, 3238, 3240, 3242, and 3243 Dimensions Width: 179 mm (7.05 inches) Height: 34.5 mm (1.36 inches) Depth: 182 mm (7.17 inches) Weight Maximum configuration as shipped: 4.86 kg (10.71 lb) (with package) Maximum configuration as shipped: 4.14 kg (9.13 lb) (without package) Environment •...
Page 44 ThinkCentre Hardware Maintenance Manual...
Page 45: Chapter 4. General Checkout
Service Support and Engineering functions. • Machine type and model • Processor or hard disk drive upgrades • Failure symptom – Do diagnostics indicate a failure? – What, when, where, single, or multiple systems? – Is the failure repeatable? © Copyright Lenovo 2012...
Page 46 – Has this configuration ever worked? – If it has been working, what changes were made prior to it failing? – Is this the original reported failure? • Diagnostics version – Type and version level • Hardware configuration – Print (print screen) configuration currently in use –...
Page 47: Chapter 5. Troubleshooting And Diagnostics
Note: If you cannot correct the problem, have the computer serviced. For a list of service and support telephone numbers, refer to the Safety and Warranty Guide that comes with your computer or go to the Lenovo Support Web site at http://www.lenovo.com/support/phone. Symptom...
Page 48: Troubleshooting Procedure
• If the diagnostic programs detect a hardware failure, contact the Lenovo Customer Support Center. See “Additional information resources” on page 34 for more information. • If you are unable to run the diagnostic programs, contact the Lenovo Customer Support Center. See “Additional information resources” on page 34 for more information.
Page 49: Audio Problems
Select the problem your computer is experiencing from the following list: • “Audio problems” on page 43 • “CD problems” on page 44 • “DVD problems” on page 45 • “Intermittent problems” on page 46 • “Hard disk drive problems” on page 47 •...
Page 50: Cd Problems
If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on page 58 for instructions). If you need technical assistance, see “Additional information resources” on page 34. An audio disc or AutoPlay-enabled disc does not automatically play when it is...
Page 51: Dvd Problems
Note that on some models the startup sequence is permanently set and cannot be changed. If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on page 58 for instructions). If you need technical assistance, see “Additional information resources” on page 34.
Page 52: Intermittent Problems
If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on page 58 for instructions). If you need technical assistance, see “Additional information resources” on page 34.
Page 53: Hard Disk Drive Problems
If airflow is blocked or the fans are not working, the computer might overheat. If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on page 58 for instructions). If you need technical assistance, see “Additional information resources” on page 34.
Page 54 See “Enabling or disabling a device” on page 61. If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on page 58 for instructions). If you need technical assistance, see “Additional information resources” on page 34.
Page 55: Monitor Problems
If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on page 58 for instructions). If you need technical assistance, see “Additional information resources” on page 34.
Page 56 If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on page 58 for instructions). If you need technical assistance, see “Additional information resources” on page 34.
Page 57: Networking Problems
If these actions do not correct the problem, your monitor might need service. See “Additional information resources” on page 34 for details. Networking problems The following are the most common networking problems. Select your networking problem from the following list: •...
Page 58: A Wireless Lan Problem
The adapter stops working for no apparent reason Symptom: The adapter stops working for no apparent reason. Action: The network driver files may be corrupt or missing. Update the driver by referring to the “Solution” description for the procedure to make sure that the correct device driver is installed. The Wake on LAN feature is not working Symptom: The Wake on LAN (WOL) feature is not working.
Page 59: Option Problems
Bluetooth, a PIM item sent from the Windows 7 operating system might be saved as a file with the extension .contact. Option problems Use this information to diagnose problems with Lenovo hardware options that do not have their own troubleshooting information. Select your symptom from the following list: •...
Page 60: Performance And Lockup Problems
If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on page 58 for instructions). If you need technical assistance, see “Additional information resources” on page 34.
Page 61: Insufficient Memory
3. Click Disk Cleanup. 4. A list of unnecessary file categories is displayed. Select each file category you want to delete, and then click OK. • 1. Click Start ➙ Control Panel. 2. Click Programs. 3. Click Turn Windows features on or off. 4.
Page 62: Printer Problems
If these actions do not correct the problem, run the diagnostic programs (see “Lenovo Solution Center” on page 58 for instructions). If you need technical assistance, see “Additional information resources” on page 34. Printer problems Symptom: The printer does not work.
Page 63: Usb Problems
Action: Some software developed before the year 2000 used only the last two digits of a year to sort dates, always assuming the first two digits were 19. Consequently, these programs sort dates out of order. Check with your software manufacturer to see if any updates are available. Many software manufacturers make updates available from the World Wide Web.
Page 64: Diagnostics
Note: If you are unable to isolate and repair the problem yourself after running the program, save and print the log files created by the program. You will need the log files when you speak to a Lenovo technical support representative.
Page 65: Copyright Lenovo
Using passwords By using the Setup Utility program, you can set passwords to prevent unauthorized access to your computer and data. The following types of passwords are available: • Power-On Password © Copyright Lenovo 2012...
Page 66: Password Considerations
• Administrator Password • Hard Disk Password You do not have to set any passwords to use your computer. However, using passwords improves computing security. If you decide to set any passwords, read the following sections. Password considerations A password can be any combination of up to 64 alphabetic and numeric characters. For security reasons, it is recommended to use a strong password that cannot be easily compromised.
Page 67: Erasing Lost Or Forgotten Passwords (Clearing Cmos)
2. From the Setup Utility program main menu, select Security. 3. Depending on the password type, select Set Power-On Password, Set Administrator Password, or Hard Disk Password. 4. Follow the instructions on the right side of the screen to set, change, or delete a password. Note: A password can be any combination of up to 64 alphabetic and numeric characters.
Page 68: Selecting A Startup Device
USB Setup Use this option to enable or disable a USB connector. When a USB connector is disabled, the device connected to the USB connector cannot be used. SATA Controller When this feature is set to Disable, all devices connected to the SATA connectors (such as hard disk drives or the optical drive) are disabled and cannot be accessed.
Page 69: Ice Performance Mode
To enable ErP compliance mode in the Setup Utility program, do the following: 1. Start the Setup Utility program. See “Starting the Setup Utility program” on page 59. 2. From the Setup Utility program main menu, select Power ➙ Enhanced Power Saving Mode, and press Enter.
Page 70: Ice Thermal Alert
4. Select ICE Performance Mode. The ICE Performance Mode window is displayed. 5. Select Better Acoustic Performance or Better Thermal Performance as desired. 6. Press F10 to save changes and exit the Setup Utility program. See “Exiting the Setup Utility program” on page 64.
Page 71: Chapter 7. Symptom-To-Fru Index
• Microprocessor(s) connection Check the power cord for continuity. Power cord Check the power-on switch for continuity. Power-on switch Beep symptoms Beep symptoms are tones or a series of tones separated by pauses (intervals without sound) during POST. © Copyright Lenovo 2012...
Page 72: Post Error Codes
The following tables describes beep symptoms. Beep Symptom FRU/Action Perform the following actions in order. 2 short beeps CMOS setting error 1. Start the Setup Utility program and press F10 to Save and exit. See Chapter 6 “Using the Setup Utility program”...
Page 73 POST Error code POST Error message Description/Action 1762 This error message is displayed when a hard disk Configuration change has occurred drive or optical drive change has been made. Press F1 to enter the Setup Utility program. Then press F10 to save and exit the Setup Utility program.
Page 74: Miscellaneous Error Messages
Miscellaneous error messages Message/Symptom FRU/Action Changing display colors Display/Monitor Computer will not power-off. See “Hard disk drive boot 1. Power Switch error” on page 65. 2. System Board 3. Riser card, if installed Computer will not RPL from server 1. Ensure that network is in startup sequence as first device or first device after diskette 2.
Page 75: Undetermined Problems
Message/Symptom FRU/Action Non-system disk or disk error-type message with a 1. Diskette Drive known-good diagnostic diskette. 2. System Board 3. Diskette Drive Cable 1. Display Other display symptoms not listed above (including blank or illegible display) 2. System Board Power-on indicator or hard disk drive in-use light not on, 1.
Page 76 d. Extended video memory e. External Cache f. External Cache RAM g. Hard disk drive h. Diskette drive 3. Turn on the power and the computer to re-test the system. 4. Repeat steps 1 through 3 until you find the failing device or adapter cards. If all devices and adapter cards have been removed, and the problem continues, replace the system board.
Page 77: Chapter 8. Locations
Figure 1. Front connector, control, and indicator locations Hard disk drive activity indicator USB 2.0 connector (USB port 1) Power indicator Headphone connector Power switch Microphone connector Optical drive eject/close button USB 2.0 connector (USB port 2) © Copyright Lenovo 2012...
Page 78: Locating Connectors On The Rear Of Your Computer
Locating connectors on the rear of your computer Figure 2 “Rear connector locations” on page 72 shows the locations of the connectors on the rear of your computer. Some connectors on the rear of your computer are color-coded to help you determine where to connect the cables on your computer.
Page 79: Locating Major Frus And Crus
Connector Description DisplayPort connector Used to attach a high-performance monitor, a direct-drive monitor, or other devices that use a DisplayPort connector. Ethernet connector Used to attach an Ethernet cable for a local area network (LAN). Note: To operate the computer within FCC Class B limits, use a Category 5 Ethernet cable.
Page 80 Figure 3. Component locations The following table lists the major FRUs shown in Figure 3 “Component locations” on page 74 and identifies which FRUs also are self-service CRUs or optional-service CRUs. Notes: ThinkCentre Hardware Maintenance Manual...
Page 81: Looking Up Fru Information
Mouse Looking up FRU information For detailed FRU information, such as the FRU part numbers and supported computer models, go to: http:/www.lenovo.com/serviceparts-lookup Locating parts on the system board Note: Your computer comes with one of the following system boards. Chapter 8...
Page 82 Figure 4 “System board part locations” on page 76 shows the locations of the parts on one type of system board. Figure 4. System board part locations 4-pin microprocessor power connector Front panel connector (for connecting LED indicators and power switch) Microprocessor Clear CMOS (Complementary Metal Oxide Semiconductor) /Recovery jumper...
Page 83 Figure 5 “System board part locations” on page 77 shows the locations of the parts on the other type of system board. Figure 5. System board part locations 4-pin microprocessor power connector Front panel connector (for connecting LED indicators and power switch) Microprocessor Clear CMOS (Complementary Metal Oxide Semiconductor)
Page 84: Locating Internal Drives
Locating internal drives Internal drives are devices that your computer uses to read and store data. You can add drives to your computer to increase storage capacity and enable your computer to read other types of media. Internal drives are installed in bays. In this manual, the bays are referred to as bay 1, bay 2, and so on. When installing or replacing an internal drive, it is important to note the type and size of the drive that you can install or replace in each bay and correctly connect the cables to the drive installed.
Page 85: And 3395
For machine types: 2756, 2800, 2929, 2932, 2934, 2941, 2945, 2961, 2982, 2988, 2993, 2996, 3181, 3183, 3185, 3187, 3198, 3202, 3207, 3209, 3214, 3218, 3224, 3227, 3306, 3393, and 3395 Locating connectors, controls, and indicators on the front of your computer Figure 7 “Front connector, control, and indicator locations”...
Page 86: Locating Connectors On The Rear Of Your Computer
Locating connectors on the rear of your computer Figure 8 “Rear connector locations” on page 80 shows the locations of the connectors on the rear of your computer. Some connectors on the rear of your computer are color-coded to help you determine where to connect the cables on your computer.
Page 87: Locating Major Frus And Crus
Connector Description DisplayPort connector Used to attach a high-performance monitor, a direct-drive monitor, or other devices that use a DisplayPort connector. Ethernet connector Used to attach an Ethernet cable for a local area network (LAN). Note: To operate the computer within FCC Class B limits, use a Category 5 Ethernet cable.
Page 88 Figure 9. Locating major FRUs and CRUs The following table lists the major FRUs shown in Figure 9 “Locating major FRUs and CRUs” on page 82 and identifies which FRUs also are self-service CRUs or optional-service CRUs. Notes: • Self-service CRUs: These CRUs unplug or are secured by no more than two screws. Examples of these types of CRUs include the keyboard, the mouse, any USB device, and the power cord.
Page 89: Looking Up Fru Information
Mouse Looking up FRU information For detailed FRU information, such as the FRU part numbers and supported computer models, go to: http:/www.lenovo.com/serviceparts-lookup Locating parts on the system board Note: Your computer comes with one of the following system boards. Chapter 8...
Page 90 Figure 10 “System board part locations” on page 84 shows the locations of the parts on one type of system board. Figure 10. System board part locations 4-pin microprocessor power connector Front panel connector (for connecting LED indicators and power switch) Microprocessor Clear CMOS (Complementary Metal Oxide Semiconductor) /Recovery jumper...
Page 91 Figure 11 “System board part locations” on page 85 shows the locations of the parts on the other type of system board. Figure 11. System board part locations 4-pin microprocessor power connector Front panel connector (for connecting LED indicators and power switch) Microprocessor Clear CMOS (Complementary Metal Oxide Semiconductor)
Page 92: Locating Internal Drives
Locating internal drives Internal drives are devices that your computer uses to read and store data. You can add drives to your computer to increase storage capacity and enable your computer to read other types of media. Internal drives are installed in bays. In this manual, the bays are referred to as bay 1, bay 2, and so on. Your computer comes with the following factory-installed drives: •...
Page 93: For Machine Types: 2119, 2121, 3229, 3234, 3235, 3236, 3237, 3238, 3240, 3242, And 3243
For machine types: 2119, 2121, 3229, 3234, 3235, 3236, 3237, 3238, 3240, 3242, and 3243 Locating connectors, controls, and indicators on the front of your computer Figure 13 “Front connector, control, and indicator locations” on page 87 shows the locations of the connectors, controls, and indicators on the front of your computer.
Page 94: Locating Connectors On The Rear Of Your Computer
Locating connectors on the rear of your computer Figure 14 “Rear connector locations” on page 88 shows the locations of the connectors on the rear of your computer. Some connectors on the rear of your computer are color-coded to help you determine where to connect the cables on your computer.
Page 95: Locating Major Frus And Crus
Connector Description USB 3.0 connector Use this connector to attach a device that requires a USB 2.0 or 3.0 connection, such as a keyboard, a mouse, a scanner, a printer, or a personal digital assistant (PDA). VGA monitor connector Used to attach a VGA monitor or other devices that use a VGA monitor connector. Locating major FRUs and CRUs Figure 15 “Component locations”...
Page 96 Figure 15. Component locations ThinkCentre Hardware Maintenance Manual...
Page 97: Looking Up Fru Information
Power switch board ac power adapter WiFi card module Battery Internal speaker Hard disk drive Keyboard Mouse Looking up FRU information For detailed FRU information, such as the FRU part numbers and supported computer models, go to: http:/www.lenovo.com/serviceparts-lookup Chapter 8 Locations...
Page 98: Locating Parts On The System Board
Locating parts on the system board Figure 16 “System board part locations” on page 92 shows the locations of the parts on the system board. Figure 16. System board part locations Internal speaker connector Optional DisplayPort connector Power switch board cable connector System fan connector Mini PCI Express card slot Clear CMOS (Complementary Metal Oxide Semiconductor)
Page 99: Chapter 9. Replacing Frus
Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page 1. Notes: 1. Use only computer parts provided by Lenovo. 2. When installing or replacing an option, use the appropriate instructions in this section along with the instructions that come with the option.
Page 100: Removing The Computer Cover
Removing the computer cover Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page 1. This section provides instructions on how to remove the computer cover. CAUTION: Turn off the computer and wait three to five minutes to let the computer cool before removing the computer cover.
Page 101: Removing And Reinstalling The Front Bezel
Removing and reinstalling the front bezel Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page 1. This section provides instructions on how to remove and reinstall the front bezel. To remove and reinstall the front bezel, do the following: 1.
Page 102 To install or replace a PCI card, do the following: 1. Turn off the computer and disconnect all power cords from electrical outlets. 2. Remove the computer cover. See “Removing the computer cover” on page 94. 3. At the rear of the computer, press the release button to open the card latch Figure 19.
Page 103 Figure 20. Removing a PCI card Notes: a. The card fits tightly into the card slot. If necessary, alternate moving each side of the card a small amount until it is removed from the card slot. b. If the card is held in place by a retaining latch, press the card retaining latch as shown to disengage the latch.
Page 104: Installing Or Replacing A Memory Module
7. Pivot the card latch to the closed position to secure the PCI card. Figure 21. Installing a PCI card What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the installation or replacement, go to “Completing the parts replacement” on page 150. Installing or replacing a memory module Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information”...
Page 105 UDIMM DIMM 1 DIMM 2 DIMM 3 DIMM 4 One UDIMM Two UDIMMs X, 1 X, 2 Three UDIMMs X, 3 X, 1 X, 2 Four UDIMMs X, 3 X, 1 X, 4 X, 2 To install or replace a memory module, do the following: 1.
Page 106: Installing Or Replacing The Optical Drive
• If you are installing a memory module, open the retaining clips of the memory slot into which you want to install the memory module. Figure 23. Opening the retaining clips 7. Position the new memory module over the memory slot. Ensure that the notch on the memory module aligns correctly with the slot key on the system board.
Page 107 2. Remove the computer cover. See “Removing the computer cover” on page 94. 3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 95. 4. Depending on whether you are installing or replacing an optical drive, do one of the following: •...
Page 108: Installing Or Replacing The Card Reader
6. Slide the new optical drive into the drive bay from the front of the computer until the optical drive snaps into position. Figure 27. Installing the optical drive 7. Connect the signal cable and the power cable to the new optical drive. Figure 28.
Page 109: Installing The Card Reader
This section provides instructions on how to install or replace the card reader. Note: The card reader is only available in some models. For new installation, see “Installing the card reader” on page 103. For replacement, see “Replacing the card reader” on page 105. Installing the card reader To install the card reader, do the following: 1.
Page 110 7. Slide the card reader with retainer into the card reader drive bay until it snaps into position. Figure 31. Installing the card reader 8. Connect the card reader cable to Front USB connector 2 on the system board. See “Locating parts on the system board”...
Page 111: Replacing The Card Reader
What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the installation or replacement, go to “Completing the parts replacement” on page 150. Replacing the card reader To replace the card reader, do the following: 1.
Page 112: Replacing The Battery
8. Slide the new card reader into the drive bay until it snaps into position. Figure 35. Installing the card reader 9. Reconnect the card reader cable to Front USB connector 2 on the system board. See “Locating parts on the system board” on page 75. 10.
Page 113: Replacing The Power Supply Assembly
4. Remove the old battery. Figure 36. Removing the old battery 5. Install a new battery. Figure 37. Installing a new battery 6. Reinstall the computer cover and connect the cables. See “Completing the parts replacement” on page 150. Note: When the computer is turned on for the first time after replacing the battery, an error message might be displayed.
Page 114 Hazardous moving parts. Keep fingers and other body parts away. CAUTION: Never remove the cover on a power supply or any part that has the following label attached. Hazardous voltage, current, and energy levels are present inside any component that has this label attached.
Page 115: Replacing The Heat Sink And Fan Assembly
9. Install and tighten the four screws to secure the power supply assembly. Note: Use only screws provided by Lenovo. 10. Reconnect the power supply assembly cables to the system board and each of the drives.
Page 116 1. Turn off the computer and disconnect all power cords from electrical outlets. 2. Remove the computer cover. See “Removing the computer cover” on page 94. 3. Lay the computer on its side for easier access to the system board. 4.
Page 117: Replacing The Microprocessor
b. Partially tighten screw , then fully tighten screw , and then fully tighten screw 10. Connect the heat sink and fan assembly cable to the microprocessor fan connector on the system board. See “Locating parts on the system board” on page 75. What to do next: •...
Page 118 6. Lift the small handle and open the retainer to access the microprocessor Figure 40. Accessing the microprocessor 7. Lift the microprocessor straight up and out of the microprocessor socket. Figure 41. Removing the microprocessor Notes: a. Your microprocessor and socket might look different from the one illustrated. ThinkCentre Hardware Maintenance Manual...
Page 119 b. Note the orientation of the microprocessor in the socket. You can either look for the small triangle on one corner of the microprocessor or note the orientation of the notches on the microprocessor. This is important when installing the new microprocessor on the system board. c.
Page 120: Replacing The System Board
What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the replacement, go to “Completing the parts replacement” on page 150. Replacing the system board Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information”...
Page 121 Figure 43. Removing the eight screws that secure the system board 10. Slide the system board to the front of the computer and then carefully pivot the failing system board upward to remove it out of the chassis. 11. Remove the microprocessor from the failing system board and install it on the new system board. See “Replacing the microprocessor”...
Page 122 Figure 44. Installing the eight screws that secure the new system board 13. Install the heat sink and fan assembly and connect the heat sink and fan assembly cable to the new system board. See “Replacing the heat sink and fan assembly” on page 109. 14.
Page 123: Installing The Solid State Drive
4. Note the orientation of the socket cover, and install one side of the socket cover into the microprocessor socket. Figure 45. Installing one side of the socket cover into the microprocessor socket Note: Your microprocessor socket and cover might look slightly different from the illustration. 5.
Page 124 1. Install the solid state drive into the storage converter. Then, install the four screws to secure the solid state drive to the storage converter. Figure 46. Installing the solid state drive into the storage converter 2. To install the solid state drive with the storage converter into the 3.5-inch hard disk drive bracket, flex the bracket and align pin , pin , pin...
Page 125: Installing Or Replacing The Msata Solid State Drive
What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the installation or replacement, go to “Completing the parts replacement” on page 150. Installing or replacing the mSATA solid state drive Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information”...
Page 126 2. Install the two screws to secure the mSATA solid state drive to the storage converter. Figure 49. Installing the screws that secure the mSATA solid state drive 3. Slide the mSATA solid state drive storage converter into the card reader drive bay until it snaps into position.
Page 127 Replacing the mSATA solid state drive To replace the mSATA solid state drive, do the following: 1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect all power cords from electrical outlets and disconnect all cables that are connected to the computer. 2.
Page 128 7. Remove the two screws that secure the mSATA solid state drive from the storage converter. Figure 52. Removing the screws that secure the mSATA solid state drive 8. Pull the mSATA solid state drive from the mini PCI Express slot on the storage converter. Figure 53.
Page 129 9. To install a new mSATA solid state drive, insert the mSATA solid state drive into the mini PCI Express slot on the storage converter, and then press the mSATA solid state drive downward. Figure 54. Installing the mSATA solid state drive into the storage converter 10.
Page 130: Replacing The Primary Hard Disk Drive
11. Slide the mSATA solid state drive storage converter into the card reader drive bay until it snaps into position. Figure 56. Installing the mSATA solid state drive 12. Connect the signal cable and the power cable to the mSATA solid state drive. What to do next: •...
Page 131 Figure 57. Removing the primary hard disk drive 6. Flex the sides of the blue bracket to remove the hard disk drive from the bracket. 7. To install a new hard disk drive into the blue bracket, flex the bracket and align pin , pin , pin and pin...
Page 132: Replacing The Secondary Hard Disk Drive
8. Slide the new hard disk drive into the drive cage until it snaps into position. Figure 59. Installing the primary hard disk drive 9. Connect the signal cable and the power cable to the new hard disk drive. What to do next: •...
Page 133 5. Pull the blue handle to release and remove the hard disk drive from the hard disk drive cage. Figure 60. Removing the secondary hard disk drive 6. Flex the sides of the blue bracket to remove the hard disk drive from the bracket. 7.
Page 134: Replacing The Front Fan Assembly
8. Slide the new hard disk drive into the hard disk drive cage until it snaps into position. Figure 62. Installing the secondary hard disk drive 9. Connect the signal cable and the power cable to the new hard disk drive. What to do next: •...
Page 135 5. The front fan assembly is attached to the chassis by four rubber mounts. Remove the front fan assembly by breaking or cutting the rubber mounts and gently pulling the front fan assembly out of the chassis. Note: The new front fan assembly will have four new rubber mounts attached. Figure 63.
Page 136: Replacing The Rear Fan Assembly
7. Pull the tips of the rubber mounts until the front fan assembly is secured in place. Figure 64. Installing the front fan assembly 8. Connect the front fan assembly cable to the power fan connector on the system board. 9.
Page 137 5. The rear fan assembly is attached to the chassis by four rubber mounts. Remove the rear fan assembly by breaking or cutting the rubber mounts and gently pulling the rear fan assembly out of the chassis. Note: The new rear fan assembly will have four new rubber mounts attached. Figure 65.
Page 138: Replacing The Front Audio And Usb Assembly
7. Pull the tips of the rubber mounts until the rear fan assembly is secured in place. Figure 66. Installing the rear fan assembly 8. Connect the rear fan assembly cable to the system fan connector on the system board. What to do next: •...
Page 139: Replacing The Internal Speaker
5. Disconnect the front audio and USB assembly cables from the system board. See “Locating parts on the system board” on page 75. Note: Ensure that you note the locations of the cables when you disconnect the cables from the system board.
Page 140 Note: The internal speaker is only available on some models. To replace the internal speaker, do the following: 1. Turn off the computer and disconnect all power cords from electrical outlets. 2. Remove the computer cover. See “Removing the computer cover” on page 94. 3.
Page 141: Replacing The Thermal Sensor
6. Position the new internal speaker into the four metal clips and push the internal speaker toward the left until it is secured in place. Figure 69. Installing a new internal speaker 7. Connect the internal speaker cable to the system board. See “Locating parts on the system board” on page 75.
Page 142 6. From inside the chassis, pivot the upper retaining clip that secures the plastic holder of the thermal sensor downward and then push the clip outward to release the clip. Then disengage the plastic holder holding the thermal sensor from the chassis. Figure 70.
Page 143: Replacing The Cover Presence Switch
8. Insert the connector and cable of the new thermal sensor into the lower hole in the chassis. Then align the two tabs on the plastic holder holding the thermal sensor with the two holes in the chassis, and push the plastic holder until it snaps into position. Figure 71.
Page 144 6. Remove the screw that secures the cover presence switch and remove the cover presence switch from the chassis. Figure 72. Removing the cover presence switch ThinkCentre Hardware Maintenance Manual...
Page 145: Replacing The Wifi Units
7. Position the new cover presence switch so that the screw hole in the cover presence switch is aligned with the corresponding hole in the chassis. Then install the screw to secure the cover presence switch to the chassis. Figure 73. Installing the new cover presence switch 8.
Page 146 1. Turn off the computer and disconnect all power cords from electrical outlets. 2. Remove the computer cover. See “Removing the computer cover” on page 94. 3. If your computer comes with a WiFi card module that supports the Bluetooth function, disconnect the Bluetooth cable from the WiFi adapter card.
Page 147 4. At the rear of the computer, press the release button to open the PCI card latch Figure 75. Opening the PCI card latch Chapter 9 Replacing FRUs (machine types: 2697, 2698, 2742, 2750, 2935, 2943, 2960, 2967, 2986, 2992, 2994, 2999, 3182, 3184, 3186, 3190, 3201, 3204, 3208, 3212, 3217, 3220, 3226, 3228, 3302, 3391, and 3392)
Page 148 5. Grasp the WiFi adapter card that is currently installed and gently pull it out of the slot. Figure 76. Removing the WiFi adapter card Note: The card fits tightly into the card slot. If necessary, alternate moving each side of the card a small amount until it is removed from the card slot.
Page 149 2. Remove the two screws that secure the WiFi card module to the WiFi adapter card. Figure 78. Removing the screws that secure the WiFi card module 3. Pull the WiFi card module out of the mini PCI Express slot to remove it from the WiFi adapter card. Figure 79.
Page 150 1. Insert the WiFi card module into the mini PCI Express slot, and then install the two screws to secure the WiFi card module to the WiFi adapter card. Figure 80. Installing the WiFi card module ThinkCentre Hardware Maintenance Manual...
Page 151 2. Connect the front antenna cable and rear antenna cable to the WiFi card module. Figure 81. Installing the WiFi antenna cables 3. Install the WiFi adapter card into the PCI Express x1 slot on the system board. See “Locating parts on the system board”...
Page 152: Installing Or Removing The Rear Wifi Antenna
What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the installation or replacement, go to “Completing the parts replacement” on page 150. Installing or removing the rear WiFi antenna Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information”...
Page 153: Installing Or Removing The Front Wifi Antenna
2. Straighten the rear WiFi antenna so that it can be more easily twisted. 3. Hold the thicker end of the rear WiFi antenna and unscrew the WiFi antenna from the rear of the computer. Figure 84. Removing the rear WiFi antenna What to do next: •...
Page 154 Figure 85. Peeling off the paper that protects the stickers 5. Stick the front antenna to the front panel as shown. Then insert the front antenna cable through the hole in the front panel. Figure 86. Installing the front WiFi antenna 6.
Page 155: Replacing The Keyboard Or Mouse
What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the installation or replacement, go to “Completing the parts replacement” on page 150. Removing the front WiFi antenna To remove the front WiFi antenna, do the following: 1.
Page 156: Completing The Parts Replacement
3. Disconnect the old keyboard cable or mouse cable from the computer. 4. Connect a new keyboard or mouse to one of the USB connectors on the computer. Depending on where you want to connect the new keyboard or mouse, see “Locating connectors, controls, and indicators on the front of your computer”...
Page 157 9. To update your configuration, refer to Chapter 6 “Using the Setup Utility program” on page 59. Note: In most areas of the world, Lenovo requires the return of the defective Customer Replaceable Unit (CRU). Information about this will come with the CRU or will come a few days after the CRU arrives.
Page 158 ThinkCentre Hardware Maintenance Manual...
Page 159: Chapter 10. Replacing Frus
Notes: 1. Use only computer parts provided by Lenovo. 2. When installing or replacing an option, use the appropriate instructions in this section along with the instructions that come with the option.
Page 160: Opening The Computer Cover
Opening the computer cover Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page 1. This section provides instructions on how to open the computer cover. CAUTION: Turn off the computer and wait three to five minutes to let the computer cool before opening the computer cover.
Page 161 3. Remove the front bezel by releasing the three plastic tabs on the top of the front bezel and pivoting the front bezel outward to remove it from the computer. Figure 91. Removing the front bezel Chapter 10 Replacing FRUs (machine types: 2756, 2800, 2929, 2932, 2934, 2941, 2945, 2961, 2982, 2988, 2993, 2996, 3181, 3183, 3185, 3187, 3198, 3202, 3207, 3209, 3214, 3218, 3224, 3227, 3306, 3393, and 3395)
Page 162: Accessing The System Board Components And Drives
4. To reinstall the front bezel, align the other three plastic tabs on the bottom of the front bezel with the corresponding holes in the chassis, then pivot the front bezel inward until it snaps into position. Figure 92. Reinstalling the front bezel What to do next: •...
Page 163: Installing Or Replacing A Memory Module
Installing or replacing a memory module Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page 1. This section provides instructions on how to install or replace a memory module. Your computer has four slots for installing or replacing DDR3 UDIMMs that provide up to a maximum of 32 GB system memory.
Page 164 • If you are replacing an old memory module, open the retaining clips and gently pull the memory module out of the memory slot. Figure 93. Removing a memory module • If you are installing a memory module, open the retaining clips of the memory slot into which you want to install the memory module.
Page 165: Installing Or Replacing A Pci Card
10. Position the new memory module over the memory slot. Ensure that the notch on the memory module aligns correctly with the slot key on the system board. Push the memory module straight down into the slot until the retaining clips close. Figure 95.
Page 166 Figure 96. Removing a PCI card Notes: a. The card fits tightly into the card slot. If necessary, alternate moving each side of the card a small amount until it is removed from the card slot. b. If the card is held in place by a retaining latch, press the card retaining latch as shown to disengage the latch.
Page 167: Installing Or Replacing The Card Reader
6. Install the new card into the appropriate card slot on the system board and rotate the card retainer to the closed position. See “Locating parts on the system board” on page 83. Figure 97. Installing the PCI card What to do next: •...
Page 168 Note: You might have to remove the metal cover of the card reader drive bay. 5. Install the new card reader into the card reader bracket. Then install the two screws to secure the card reader to the bracket. 6. Install the card reader bracket to the chassis. Then push the bracket to the left to align the screw hole in the bracket with the corresponding hole in the chassis.
Page 169 7. Install the screw to secure the card reader bracket to the chassis. Figure 99. Installing the screw that secures the card reader 8. Connect the card reader cable to one of the USB connectors on the system board. See “Locating parts on the system board”...
Page 170 Replacing the card reader To replace the card reader, do the following: 1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect all power cords from electrical outlets and disconnect all cables that are connected to the computer. 2.
Page 171 9. Install the card reader bracket to the chassis. Then push the bracket to the left to align the screw hole in the bracket with the corresponding hole in the chassis. Figure 102. Installing the card reader Chapter 10 Replacing FRUs (machine types: 2756, 2800, 2929, 2932, 2934, 2941, 2945, 2961, 2982, 2988, 2993, 2996, 3181, 3183, 3185, 3187, 3198, 3202, 3207, 3209, 3214, 3218, 3224, 3227, 3306, 3393, and 3395)
Page 172: Installing Or Replacing The Msata Solid State Drive
10. Install the screw to secure the card reader bracket to the chassis. Figure 103. Installing the screw that secures the card reader 11. Reconnect the card reader cable to one of the USB connectors on the system board. See “Locating parts on the system board”...
Page 173 1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect all power cords from electrical outlets and disconnect all cables that are connected to the computer. 2. Open the computer cover. See “Opening the computer cover” on page 154. 3.
Page 174 Figure 106. Installing the mSATA solid state drive storage converter 8. Install the screw to secure the mSATA solid state drive storage converter to the chassis. ThinkCentre Hardware Maintenance Manual...
Page 175 Figure 107. Installing the screw that secures the mSATA solid state drive storage converter 9. Connect the signal cable and the power cable to the mSATA solid state drive. 10. Pivot the optical drive bay downward until it snaps into position. 11.
Page 176 Figure 108. Removing the mSATA solid state drive storage converter 8. Remove the two screws that secure the mSATA solid state drive from the storage converter. Figure 109. Removing the screws that secure the mSATA solid state drive ThinkCentre Hardware Maintenance Manual...
Page 177 9. Remove the mSATA solid state drive from the mini PCI Express slot on the storage converter. Figure 110. Removing the mSATA solid state drive 10. To install a new mSATA solid state drive, insert the mSATA solid state drive into the mini PCI Express slot on the storage converter, and then press the mSATA solid state drive downward.
Page 178 12. Insert the mSATA solid state drive storage converter into the chassis. Then push the converter to the left to align the screw hole in the converter with the corresponding hole in the chassis. Figure 113. Installing the mSATA solid state drive storage converter ThinkCentre Hardware Maintenance Manual...
Page 179: Replacing The Battery
13. Install the screw to secure the mSATA solid state drive storage converter to the chassis. Figure 114. Installing the screw that secures the storage converter 14. Connect the signal cable and the power cable to the mSATA solid state drive. 15.
Page 180: Installing The Solid State Disk
To replace the battery, do the following: 1. Turn off the computer and disconnect all power cords from electrical outlets. 2. Open the computer cover. See “Opening the computer cover” on page 154. 3. Locate the battery. See “Locating parts on the system board” on page 83. 4.
Page 181 1. Install the solid state disk into the adapter. Then, install the four screws to secure the solid state disk to the adapter. Figure 117. Installing the solid state disk into the adapter 2. To install the solid state disk with the adapter into the 3.5-inch hard disk drive bracket, flex the bracket and align pin , pin , pin...
Page 182: Replacing The Hard Disk Drive
• To complete the installation or replacement, go to “Completing the parts replacement” on page 210. Replacing the hard disk drive Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page 1. This section provides instructions on how to replace the hard disk drive.
Page 183 6. Flex the retaining clips as shown to remove the hard disk drive from the bracket. Figure 120. Removing the hard disk drive from the bracket 7. To install a new hard disk drive into the bracket, flex the bracket and align pin , pin , pin , and pin...
Page 184: Replacing The Optical Drive
9. Insert the two retaining clips of the hard disk drive bracket into the corresponding holes in the side of the optical drive bay, and then pivot the hard disk drive and bracket downwards until the hard disk drive bracket snaps into position. Figure 121.
Page 185 5. Press the blue retaining clip to pivot the optical drive bay upward. Figure 122. Pivoting the optical drive bay 6. Disconnect the signal cable and the power cable from the rear of the optical drive. Chapter 10 Replacing FRUs (machine types: 2756, 2800, 2929, 2932, 2934, 2941, 2945, 2961, 2982, 2988, 2993, 2996, 3181, 3183, 3185, 3187, 3198, 3202, 3207, 3209, 3214, 3218, 3224, 3227, 3306, 3393, and 3395)
Page 186 7. Press the optical drive lock and slide the optical drive out of the rear of the drive bay assembly. Figure 123. Removing the old optical drive 8. Install the optical drive retainer on the side of the new optical drive. Figure 124.
Page 187: Replacing The Heat Sink And Fan Assembly
9. Slide the new optical drive into the drive bay until it snaps into position. Figure 125. Installing a new optical drive 10. Connect the signal cable and the power cable to the rear of the optical drive. What to do next: •...
Page 188 3. Disconnect the heat sink and fan assembly cable from the microprocessor fan connector on the system board. See “Locating parts on the system board” on page 83. 4. Follow this sequence to remove the four screws that secure the heat sink and fan assembly to the system board: a.
Page 189 6. Pivot the two plastic retaining clips that secure the heat sink fan duct outward. Then remove the heat sink fan duct from the failing heat sink and fan assembly. Figure 127. Removing the heat sink fan duct 7. Place the new heat sink and fan assembly on the system board so that the four screws are aligned with the corresponding holes in the system board.
Page 190: Replacing The Power Supply Assembly
10. Lower and position the heat sink fan duct on the top of the heat sink and fan assembly until it snaps into position. Figure 128. Installing the heat sink fan duct What to do next: • To work with another piece of hardware, go to the appropriate section. •...
Page 191 Hazardous moving parts. Keep fingers and other body parts away. CAUTION: Never remove the cover on a power supply or any part that has the following label attached. Hazardous voltage, current, and energy levels are present inside any component that has this label attached.
Page 192 5. Pivot the two plastic retaining clips that secure the heat sink fan duct outward, and then lift the heat sink fan duct out of the chassis. Figure 129. Removing the heat sink fan duct ThinkCentre Hardware Maintenance Manual...
Page 193 6. Pivot the optical drive upward and disconnect the power supply assembly cables from all drives and from power connectors on the system board. Figure 130. Power connectors on the system board 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.
Page 194 Then, install the three screws to secure the new power supply assembly in place. Note: Use only screws provided by Lenovo. Figure 132. Installing the power supply assembly 10.
Page 195: Replacing The Microprocessor
11. Lower and position the heat sink fan duct on the top of the heat sink and fan assembly until it snaps into position. Figure 133. Installing the heat sink fan duct What to do next: • To work with another piece of hardware, go to the appropriate section. •...
Page 196 3. Locate the system board and disconnect all cables connected to the system board. See “Locating parts on the system board” on page 83. 4. Remove the heat sink and fan assembly with the fan duct. See “Replacing the heat sink and fan assembly”...
Page 197 b. Note the orientation of the microprocessor in the socket. You can either look for the small triangle on one corner of the microprocessor or note the orientation of the notches on the microprocessor. This is important when installing the new microprocessor on the system board. c.
Page 198: Replacing The System Board
12. Reinstall the heat sink and fan assembly with the fan duct as shown. See “Replacing the heat sink and fan assembly” on page 181. Figure 137. Reinstalling the heat sink and fan assembly with the fan duct 13. Reconnect all cables that were disconnected from the system board. What to do next: •...
Page 199 2. Open the computer cover. See “Opening the computer cover” on page 154. 3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 154. 4. Pivot the optical drive bay assembly upward to gain access to the system board. See “Accessing the system board components and drives”...
Page 200 Figure 139. Installing the eight screws that secure the new system board 12. Install the heat sink and fan assembly and connect the heat sink and fan assembly cable to the new system board. See “Replacing the heat sink and fan assembly” on page 181. 13.
Page 201: Replacing The Cover Presence Switch
4. Note the orientation of the socket cover, and install one side of the socket cover into the microprocessor socket. Figure 140. Installing one side of the socket cover into the microprocessor socket Note: Your microprocessor socket and cover might look slightly different from the illustration. 5.
Page 202 6. Remove the screw that secures the cover presence switch and remove the cover presence switch from the chassis. Figure 141. Removing the cover presence switch 7. Position the new cover presence switch so that the screw hole in the cover presence switch is aligned with the corresponding hole in the chassis.
Page 203: Replacing The Internal Speaker
8. Install the screw to secure the cover presence switch to the chassis. Figure 142. Installing the new cover presence switch 9. Reconnect the cover presence switch cable to the system board. See “Locating parts on the system board” on page 83. 10.
Page 204 2. Open the computer cover. See “Opening the computer cover” on page 154. 3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 154. 4. Locate the internal speaker. See “Locating major FRUs and CRUs” on page 81. 5.
Page 205: Replacing The Front Audio And Usb Assembly
Figure 144. Installing the new internal speaker 9. Reconnect the internal speaker cable to the system board. See “Locating parts on the system board” on page 83. 10. Reinstall the cover presence switch. See “Replacing the cover presence switch” on page 195. 11.
Page 206 2. Open the computer cover. See “Opening the computer cover” on page 154. 3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 154. 4. Pivot the optical drive bay upward and disconnect the front audio and USB assembly cables from the system board and note the cables routing.
Page 207: Replacing The Wifi Units
Replacing the WiFi units Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page 1. This section provides instructions on how to replace the WiFi units. The WiFi units include a WiFi adapter card, a WiFi card module, and a rear WiFi antenna cable.
Page 208 5. Grasp the WiFi adapter card that is currently installed and gently pull it out of the slot. Figure 147. Removing the WiFi adapter card Note: The card fits tightly into the card slot. If necessary, alternate moving each side of the card a small amount until it is removed from the card slot.
Page 209 2. Remove the two screws that secure the WiFi card module to the WiFi adapter card. Figure 149. Removing the screws that secure the WiFi card module 3. Pull the WiFi card module out of the mini PCI Express slot to remove it from the WiFi adapter card. Figure 150.
Page 210 1. Insert the WiFi card module into the mini PCI Express slot, and then install the two screws to secure the WiFi card module to the WiFi adapter card. Figure 151. Installing the WiFi card module 2. Connect the front antenna cable and rear antenna cable to the WiFi card module. Figure 152.
Page 211: Installing Or Removing The Rear Wifi Antenna
3. Install the WiFi adapter card into the PCI Express x1 slot on the system board. See “Locating parts on the system board” on page 83. 4. If the installed WiFi card module supports the Bluetooth function, use a Bluetooth cable to connect the Bluetooth connector on the WiFi adapter card to the front USB connector on the system board.
Page 212 Figure 154. Installing the rear WiFi antenna What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the installation or replacement, go to “Completing the parts replacement” on page 210. Removing the rear WiFi antenna To remove the rear WiFi antenna, do the following: 1.
Page 213: Installing Or Removing The Front Wifi Antenna
3. Hold the thicker end of the rear WiFi antenna and unscrew the WiFi antenna from the rear of the computer. Figure 155. Removing the rear WiFi antenna What to do next: • To work with another piece of hardware, go to the appropriate section. •...
Page 214 Figure 156. Peeling off the paper that protects the stickers 6. Stick the front antenna to the front panel as shown. Then insert the front antenna cable through the hole in the front panel. Figure 157. Installing the front WiFi antenna ThinkCentre Hardware Maintenance Manual...
Page 215: Removing The Front Wifi Antenna
7. Connect the front antenna cable to the WiFi card module. 8. Reinstall the hard disk drive. See “Replacing the hard disk drive” on page 176. What to do next: • To work with another piece of hardware, go to the appropriate section. •...
Page 216: Replacing The Keyboard Or Mouse
Replacing the keyboard or mouse Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page 1. This section provides instructions on how to replace the keyboard or mouse. To replace the keyboard or mouse, do the following: 1.
Page 217 8. To update your configuration, see Chapter 6 “Using the Setup Utility program” on page 59. Note: In most areas of the world, Lenovo requires the return of the defective Customer Replaceable Unit (CRU). Information about this will come with the CRU or will come a few days after the CRU arrives.
Page 218 ThinkCentre Hardware Maintenance Manual...
Page 219: Chapter 11. Replacing Frus
Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page 1. Notes: 1. Use only computer parts provided by Lenovo. 2. When installing or replacing an option, use the appropriate instructions in this section along with the instructions that come with the option.
Page 220 Note: The vertical stand is only available on some models. To install or remove the vertical stand, do the following: 1. Turn off the computer. 2. Align the rear of the computer with the rear of the vertical stand and position the computer on the vertical stand as shown.
Page 221: Installing Or Removing The Vesa Mount Bracket
3. To remove the vertical stand, lift the computer to remove it from the vertical stand. Figure 161. Removing the computer from the vertical stand Installing or removing the VESA mount bracket Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information”...
Page 222 2. To install the VESA mount bracket, slide the computer into the VESA mount bracket. Figure 162. Installing the VESA mount bracket 3. Install the two screws to secure the VESA mount bracket to the computer. Figure 163. Installing the screws that secure the VESA mount bracket ThinkCentre Hardware Maintenance Manual...
Page 223: Removing The Computer Cover
4. To remove the VESA mount bracket from the computer, remove the two screws that secure the VESA mount bracket to the computer. Figure 164. Removing the screws that secure the VESA mount bracket 5. Slide the computer from the front of the VESA mount bracket to remove the VESA mount bracket from the computer.
Page 224 This section provides instructions on how to remove the computer cover. CAUTION: Turn off the computer and wait three to five minutes to let the computer cool before removing the computer cover. To remove the computer cover, do the following: 1.
Page 225: Installing Or Replacing A Memory Module
6. Slide the computer cover to the front of the computer a small amount. Lift the computer cover to remove it from the computer. Figure 167. Removing the computer cover Installing or replacing a memory module Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information”...
Page 226 Your computer has two slots for installing or replacing DDR3 SODIMMs that provide up to a maximum of 16 GB system memory. When installing or replacing a memory module, use 2 GB, 4GB, or 8GB DDR3 SODIMMs in any combination up to a maximum of 16 GB. To install or replace a memory module, do the following: 1.
Page 227: Replacing The Optical Drive
• To complete the installation or replacement, go to “Completing the parts replacement” on page 262. Replacing the optical drive Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page 1. This section provides instructions on how to replace the optical drive.
Page 228 4. Remove the screw that secures the optical drive in the optical drive box. Use the screwdriver to slide the optical drive forward and then remove the optical drive from the optical drive box. Figure 171. Removing the optical drive from the optical drive box 5.
Page 229 6. Align the two screw holes in the optical drive metal plate with the corresponding holes in the new optical drive and then install the two screws to secure the metal plate on the new optical drive. Figure 173. Installing the optical drive metal plate 7.
Page 230 8. Install the screw that secures the optical drive in the optical drive box. Figure 175. Installing the screw that secures the optical drive ThinkCentre Hardware Maintenance Manual...
Page 231 9. Align the screw holes in the optical drive box with the two screws on the VESA mount bracket and then slide the optical drive box to install it on the VESA mount bracket. Figure 176. Installing the optical drive box Chapter 11 Replacing FRUs (machine types: 2119, 2121, 3229, 3234, 3235, 3236, 3237, 3238, 3240, 3242, and 3243)
Page 232: Replacing The Secondary Hard Disk Drive
10. Install the screw that secures the optical drive box on the VESA mount bracket. Figure 177. Installing the screw that secures the optical drive box 11. Connect the optical drive cable to a USB connector on the computer. See “Locating connectors on the rear of your computer”...
Page 233 3. Remove the screw that secures the optical drive box on the VESA mount bracket and then slide the optical drive box to remove it from the VESA mount bracket. Figure 178. Removing the optical drive box 4. Slide the release button on the optical drive box and then remove the secondary hard disk drive adapter from the optical drive box.
Page 234 5. Flex the sides of the hard disk drive adapter bracket and then pivot the hard disk drive adapter to remove the adapter from the adapter bracket. Figure 180. Removing the hard disk drive adapter from the adapter bracket 6. To remove the hard disk drive from the adapter, lift the adapter retaining latch. Slide the hard disk drive towards the retaining latch and then lift the hard disk drive out of the adapter.
Page 235 7. Install a new hard disk drive into the adapter. Lower the adapter retaining latch until it snaps into position. Figure 182. Installing a new hard disk drive into the adapter 8. Position the adapter into the adapter bracket and then pivot the adapter downward until it snaps into position.
Page 236 9. Slide the adapter bracket into the optical drive box until it snaps into position. Figure 184. Installing the adapter bracket into the optical drive box ThinkCentre Hardware Maintenance Manual...
Page 237 10. Align the screw holes in the optical drive box with the two screws on the VESA mount bracket and then slide the optical drive box to install it on the VESA mount bracket. Figure 185. Installing the optical drive box Chapter 11 Replacing FRUs (machine types: 2119, 2121, 3229, 3234, 3235, 3236, 3237, 3238, 3240, 3242, and 3243)
Page 238: Replacing The Battery
11. Install the screw that secures the optical drive box on the VESA mount bracket. Figure 186. Installing the screw that secures the optical drive box 12. Connect the secondary hard disk drive cable to a USB connector on the computer. See “Locating connectors on the rear of your computer”...
Page 239: Replacing The Ac Power Adapter
4. Remove the old battery. Figure 187. Removing the old battery 5. Install a new battery. Figure 188. Installing a new battery 6. Reinstall the computer cover and connect the cables. See “Completing the parts replacement” on page 262. Note: When the computer is turned on for the first time after replacing the battery, an error message might be displayed.
Page 240 2. Remove the power cord from the ac power adapter cable loop at the rear of the computer and then disconnect the ac power adapter from the ac power adapter connector. See “Locating connectors on the rear of your computer” on page 88. Figure 189.
Page 241: Replacing The Ac Power Adapter Bracket
3. Connect the new ac power adapter to the ac power adapter connector at the rear of your computer and an workable electrical outlet. Secure the power cord into the power adapter cable loop at the rear of the computer as shown. Figure 190.
Page 242 2. Press the metal tab and then slide the ac power adapter bracket to remove it from the VESA mount bracket. Figure 191. Removing the ac power adapter bracket 3. To install the ac power adapter bracket to the VESA mount bracket, align the two tabs on the ac power adapter bracket with the slots in the VESA mount bracket, and then slide the ac power adapter bracket to install it on the VESA mount bracket.
Page 243: Replacing The Power Switch Board
What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the installation or replacement, go to “Completing the parts replacement” on page 262. Replacing the power switch board Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information”...
Page 244 8. Remove the power switch board from the computer. Figure 194. Removing the power switch board 9. Align the hole in the new power switch board with the corresponding tab on the computer and position the new power switch board in the computer. Figure 195.
Page 245: Replacing The Heat Sink
10. Install the screw to secure the new power switch board in the computer. Figure 196. Installing the screw that secures the power switch board 11. Connect the power switch board cable to the power switch board cable connector on the system board. See “Locating parts on the system board”...
Page 246 4. Pull the intrusion switch to remove it from the heat sink bracket. Figure 197. Removing the intrusion switch 5. Follow this sequence to remove the four screws that secure the heat sink and fan assembly to the system board: a.
Page 247 a. You might have to gently twist the heat sink and fan assembly to free it from the microprocessor. b. Do not touch the thermal grease while handling the heat sink and fan assembly. 7. Position the new heat sink and fan assembly on the system board so that the four screws are aligned with the holes in the system board.
Page 248: Replacing The Microprocessor
What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the installation or replacement, go to “Completing the parts replacement” on page 262. Replacing the microprocessor Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information”...
Page 249 5. Lift the microprocessor straight up and out of the microprocessor socket. Figure 202. Removing the microprocessor Notes: a. Your microprocessor and socket might look different from the one illustrated. b. Note the orientation of the microprocessor in the socket. You can either look for the small triangle on one corner of the microprocessor or note the orientation of the notches on the microprocessor.
Page 250: Replacing The System Board
9. Lower the new microprocessor straight down into the microprocessor socket on the system board. Figure 203. Installing the microprocessor 10. Close the microprocessor retainer and lock it into position with the small handle to secure the new microprocessor in the socket. 11.
Page 251 5. Remove the heat sink. See “Replacing the heat sink” on page 239. 6. Remove the system fan. See “Replacing the system fan” on page 257. 7. Remove the WiFi card module if your computer has one. See “Replacing the WiFi card module” on page 252.
Page 252 10. Pivot the failing system board upward to remove it out of the chassis. Figure 205. Removing the system board 11. Remove the microprocessor from the failing system board and install it on the new system board. See “Replacing the microprocessor” on page 242. 12.
Page 253: Replacing The Hard Disk Drive Bracket
3. Lower the microprocessor retainer, and then lower the lever to secure the retainer. Ensure that the lever is locked into position. 4. Note the orientation of the socket cover, and install one side of the socket cover into the microprocessor socket.
Page 254 5. Remove the two screws that secure the hard disk drive bracket on the system board. Figure 207. Removing the screws that secure the hard disk drive bracket ThinkCentre Hardware Maintenance Manual...
Page 255 6. Slide the hard disk drive bracket toward the heat sink and then lift the hard disk drive bracket to remove it from the computer. Figure 208. Removing the hard disk drive bracket Chapter 11 Replacing FRUs (machine types: 2119, 2121, 3229, 3234, 3235, 3236, 3237, 3238, 3240, 3242, and 3243)
Page 256 7. To install the hard disk drive bracket into the computer, position the hard disk drive bracket on the system board so that the two holes in the hard disk drive bracket are aligned with the standoffs on the system board. Slide the hard disk drive bracket as shown until the two screw holes are aligned with the corresponding screw posts on the system board.
Page 257: Replacing The Hard Disk Drive
• To complete the installation or replacement, go to “Completing the parts replacement” on page 262. Replacing the hard disk drive Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page 1. This section provides instructions on how to replace the hard disk drive.
Page 258: Replacing The Wifi Card Module
Replacing the WiFi card module Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page 1. This section provides instructions on how to replace the WiFi card module. Note: The WiFi card module is only available in some models. To replace the WiFi card module, do the following: 1.
Page 259 6. Pull the WiFi card module to remove it out of the mini PCI Express slot. Figure 214. Removing the WiFi card module 7. Insert the new WiFi card module into the mini PCI Express slot. Pivot the WiFi card module downward and then install the two screws to secure the WiFi card module.
Page 260: Installing Or Removing The Rear Wifi Antenna
What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the installation or replacement, go to “Completing the parts replacement” on page 262. Installing or removing the rear WiFi antenna Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information”...
Page 261 3. Adjust the angle of the rear antenna to lower the risk of breaking the antenna by accident. Figure 217. Installing the rear WiFi antenna Figure 218. Installing the rear WiFi antennas What to do next: • To work with another piece of hardware, go to the appropriate section. •...
Page 262 2. Straighten the rear WiFi antenna so that it can be more easily twisted. 3. Hold the thicker end of the rear WiFi antenna and unscrew the WiFi antenna from the rear of the computer. Figure 219. Removing the rear WiFi antenna Figure 220.
Page 263: Replacing The System Fan
Replacing the system fan Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety information” on page 1. This section provides instructions on how to replace the system fan. To replace the system fan, do the following: 1.
Page 264 7. Lift the failing system fan off the system board. Figure 222. Removing the system fan 8. Position the new system fan on the system board so that the four screws are aligned with the screw posts on the system board. Figure 223.
Page 265: Replacing The Internal Speaker
9. Install the four screws that secure the system fan. Figure 224. Installing the screws that secure the system fan 10. Connect the system fan cable to the system fan connector on the system board. See “Locating parts on the system board” on page 92. 11.
Page 266 6. Press the tab that secures the internal speaker and then pivot the internal speaker outward as shown to completely remove the internal speaker from the internal speaker holder. Figure 225. Removing the internal speaker ThinkCentre Hardware Maintenance Manual...
Page 267: Replacing The Keyboard Or Mouse
7. Position the new internal speaker into the internal speaker holder and then pivot the internal speaker inward until it is secured in place. Figure 226. Installing a new internal speaker 8. Connect the internal speaker cable to the system board. See “Locating parts on the system board” on page 92.
Page 268: Completing The Parts Replacement
2. Connect a new keyboard or mouse to one of the USB connectors on the computer. Depending on where you want to connect the new keyboard or mouse, see “Locating connectors, controls, and indicators on the front of your computer” on page 87 or “Locating connectors on the rear of your computer”...
Page 269 3. Position the computer cover on the chassis and then push the cover to the rear of the computer until it snaps into position. Figure 228. Installing the computer cover Chapter 11 Replacing FRUs (machine types: 2119, 2121, 3229, 3234, 3235, 3236, 3237, 3238, 3240, 3242, and 3243)
Page 270 7. To update your configuration, refer to Chapter 6 “Using the Setup Utility program” on page 59. Note: In most areas of the world, Lenovo requires the return of the defective Customer Replaceable Unit (CRU). Information about this will come with the CRU or will come a few days after the CRU arrives.
Page 271: Chapter 12. Additional Service Information
“Using passwords” on page 59. Operating system password Note: This section applies only to computer models that have an operating system preinstalled from Lenovo. An operating system password is very similar to a power-on password and denies access to the computer by an unauthorized user when the password is activated.
Page 272: Updating (Flashing) The Bios From Your Operating System
Updating (flashing) the BIOS from your operating system Note: Because Lenovo makes constant improvements to its Web sites, the Web page contents are subject to change without notice, including the contents referenced in the following procedure.
Page 273: Power Management
4. Remove any cables that impede access to the Clear CMOS /Recovery jumper. 5. Move the jumper from the standard position (pin 1 and pin 2) to the maintenance position (pin 2 and pin 3). 6. Reconnect any cables that were disconnected and reinstall the PCI card if removed. 7.
Page 274 ThinkCentre Hardware Maintenance Manual...
Page 275: Appendix A. Notices
Lenovo representative for information on the products and services currently available in your area. Any reference to a Lenovo product, program, or service is not intended to state or imply that only that Lenovo product, program, or service may be used. Any functionally equivalent product, program, or service that does not infringe any Lenovo intellectual property right may be used instead.
Page 276: Television Output Notice
Macrovision Corporation. Reverse engineering or disassembly is prohibited. European conformance CE mark Trademarks The following terms are trademarks of Lenovo in the United States, other countries, or both: Lenovo The Lenovo logo Rescue and Recovery...
Page 277: Index
73, 81 devices, handling static-sensitive 93, 153, 213 keyboard, replacing 149, 210, 261 diagnostics, troubleshooting DisplayPort connector 73, 81, 88 drives bays 78, 86 specifications 78, 86 Lenovo Solution Center locating components 73, 81, 89 © Copyright Lenovo 2012...
Page 278 looking up part numbers 1, 71, 75, 83, 91, 93, 153, 213 card reader hard disk drive 124, 176, 251 hard disk drive bracket heat sink heat sink and fan assembly 109, 181 memory module microprocessor 111, 189, 242 installing, replacing 98, 157, 219 mSATA solid state drive 121, 169...
Page 279 VESA mount bracket, installing or removing VGA monitor connector 73, 81, 89 viewing and changing settings WiFi card module, replacing WiFi units, WiFi adapter card, WiFi card module, WiFi antenna cable, replacing 139, 201 © Copyright Lenovo 2012...
Page 280 ThinkCentre Hardware Maintenance Manual...

This manual is also suitable for:

Thinkcentre m92 Thinkcentre m92p Thinkcentre 2119 Thinkcentre 2121 Thinkcentre 2697 Thinkcentre 2698 ... Show all

Lenovo ThinkCentre M82 Hardware Maintenance Manual

Chapter 1. About this Manual

Chapter 2. Safety Information

Chapter 3. General Information

Chapter 4. General Checkout

Chapter 5. Troubleshooting and Diagnostics

Chapter 6. Using the Setup Utility Program

Chapter 7. Symptom-To-FRU Index

Chapter 8. Locations

Chapter 9. Replacing Frus

3228, 3302, 3391, and 3392)

Chapter 10. Replacing Frus

3227, 3306, 3393, and 3395)

Chapter 11. Replacing Frus

Chapter 12. Additional Service Information

Appendix A. Notices

Index

Quick Links

Troubleshooting

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Summary of Contents for Lenovo ThinkCentre M82