Lenovo T420- Manuals

About this manual This manual contains service and reference information for the following ThinkPad ® products. ThinkPad T420 and T420i Machine Type 4177, 4178, 4179, 4180, 4236, 4237, and 4238 Use this manual along with the advanced diagnostic tests to troubleshoot problems. Important: This manual ...

iv ThinkPad T420 and T420i Hardware Maintenance Manual

Chapter 1. Safety information This chapter presents following safety information that you need to be familiar with before you servicea ThinkPad Notebook.• “General safety” on page 1 • “Electrical safety” on page 2 • “Safety inspection guide” on page 3 • “Handling devices that are sensitive to electr...

Electrical safety Observe the following rules when working on electrical equipment. Important: Use only approved tools and test equipment. Some hand tools have handles covered with a soft material that doesnot insulate you when working with live electrical currents.Many customers have, near their eq...

Notes: 1. Use product-specific ESD procedures when they exceed the requirements noted here. 2. Make sure that the ESD protective devices you use have been certified (ISO 9000) as fully effective. When handling ESD-sensitive parts: • Keep the parts in protective packages until they are inserted into ...

Safety notices (multilingual translations) The safety notices in this section are provided in the following languages:• English• Arabic• Brazilian Portuguese• French• German• Hebrew• Japanese• Korean• Spanish• Traditional Chinese DANGER Before the computer is powered on after FRU replacement, make s...

Laser compliance statement (multilingual translations) The laser compliance statements in this section are provided in the following languages:• English• Arabic• Brazilian Portuguese• French• German• Hebrew• Japanese• Korean• Spanish• Traditional Chinese Chapter 1 . Safety information 17

Chapter 2. Important service information This chapter presents following important service information that applies to all machine types supported bythis manual:• “Strategy for replacing FRUs” on page 23 – “Strategy for replacing a hard disk drive” on page 23 – “Important notice for replacing a syst...

Attention: The drive startup sequence in the computer you are servicing may have been changed. Be extremely careful during write operations such as copying, saving, or formatting. If you select an incorrectdrive, data or programs can be overwritten. If your computer is shipped with an mSATA drive an...

Strategy for replacing FRUs for CTO, CMV, and GAV Product definition Dynamic Configure To Order (CTO) This provides the ability for a customer to configure a Lenovo solution from an eSite, and have thisconfiguration sent to fulfillment, where it is built and shipped directly to the customer. The mac...

Chapter 3. General checkout This chapter presents following information:• “What to do first” on page 28 • “Checkout guide” on page 29 – “Diagnostics using PC-Doctor for DOS” on page 29 – “Lenovo ThinkVantage Toolbox” on page 31 – “FRU tests” on page 33 • “Power system checkout” on page 34 The descri...

What to do first When you do return a FRU, you must include the following information in the parts exchange form orparts return form that you attach to it: 1. Name and phone number of service technician2. Date of service3. Date on which the machine failed4. Date of purchase5. Failure symptoms, error...

Checkout guide Use the following procedures as a guide in identifying and correcting problems with the ThinkPad Notebook. Note: The diagnostic tests are intended to test only ThinkPad products. The use of non-ThinkPad products, prototype cards, or modified options can lead to false indications of er...

3. Turn on the computer. If the computer cannot be powered on, go to “Power system checkout” on page 34, and check the power sources. If an error code appears, go to “Symptom-to-FRU index” on page 43. 4. When the ThinkPad logo comes up, immediately press F12 to enter the Boot Menu. 5. Insert the PC-...

11. Follow the instructions on the screen. If there is a problem, PC-Doctor shows messages describing it. 12. To exit the test, select Quit — Exit Diag . To cancel the test, press Esc. Note: After running PC-Doctor, check the time and date on the system and reset them if they are incorrect. Detectin...

FRU tests The following table shows the test for each FRU. Table 1. FRU tests FRU Applicable test Systemboard 1. Diagnostics ➙ CPU/Coprocessor 2. Diagnostics ➙ Systemboard 3. If the docking station or the port replicator is attached to the ThinkPad Notebook, detach it. 4. Place the computer on a hor...

Power system checkout To verify a symptom, do the following: 1. Turn off the computer.2. Remove the battery pack.3. Connect the ac power adapter.4. Check that power is supplied when you turn on the computer.5. Turn off the computer.6. Disconnect the ac power adapter and install the charged battery p...

Perform operational charging. If the battery status indicator or icon does not turn on, remove the batterypack and let it return to room temperature. Reinstall the battery pack. If the charge indicator or icon still doesnot turn on, replace the battery pack. If the charge indicator still does not tu...

Wire Voltage (V dc) Red +2.5 to +3.2 Black Ground • If the voltage is correct, replace the system board. • If the voltage is not correct, replace the backup battery. • If the backup battery discharges quickly after replacement, replace the system board. 36 ThinkPad T420 and T420i Hardware Maintenanc...

Chapter 4. Related service information This chapter presents following information:• “Restoring the factory contents by using Recovery Disc Set” on page 37 • “Passwords” on page 38 • “Power management” on page 41 • “Symptom-to-FRU index” on page 43 Service Web site: When the latest maintenance diske...

2. Insert the Operating System Recovery Disc into the DVD drive. 3. Press F10 to save the ThinkPad Setup program configuration changes. Follow the instructions on the screen to begin the recovery process. 4. Select your language and click Next . 5. Read the license. If you agree with the terms and c...

Attention: If the user HDP has been forgotten, check whether a master HDP has been set. If it has, it can be used for access to the hard disk drive. If no master HDP is available, neither Lenovo nor Lenovo authorizedservice technicians provide any services to reset either the user or the master HDP,...

Power management To reduce power consumption, the computer has three power management modes: screen blank, sleep(standby in Windows XP), and hibernation. Screen blank mode If the time set on the “Turn off monitor” timer in the operating system expires, the LCD backlight turns off. To put the compute...

Symptom-to-FRU index This section contains following information:• “Numeric error codes” on page 43 • “Error messages” on page 45 • “Beep symptoms” on page 46 • “No-beep symptoms” on page 46 • “LCD-related symptoms” on page 46 • “Intermittent problems” on page 48 • “Undetermined problems” on page 48...

Error messages Table 3. Error messages Symptom or error FRU or action, in sequence Fan error. 1. Fan . 2. Thermal grease.3. System board. Thermal sensing error. System board . This system does not support batteries that are notgenuine Lenovo-made or authorized. This system willcontinue to boot, but ...

Beep symptoms Table 4. Beep symptoms Symptom or error FRU or action, in sequence One beep and a blank, unreadable, or flashing LCD. 1. Reseat the LCD connector . 2. LCD assembly.3. External CRT.4. System board. One long and two short beeps, and a blank or unreadableLCD. 1. System board . 2. LCD asse...

Intermittent problems Intermittent system hang problems can be due to a variety of causes that have nothing to do with a hardwaredefect, such as cosmic radiation, electrostatic discharge, or software errors. FRU replacement should beconsidered only when a problem recurs. When analyzing an intermitte...

Chapter 5. Status indicators This chapter presents the system status indicators that show the status of the computer. 7 1 2 6 8 9 3 4 5 © Copyright Lenovo 2011 49

5 6 1 1 1 0 Table 7. Status indicators Indicator Meaning 1 Speaker mute Orange: The speaker is on mute. To set the speakers on mute or unmute,press the speaker mute button. 2 Microphone mute Orange: The microphone is on mute. None of the recording devices isavailable while the microphone mute is on ...

Table 7. Status indicators (continued) Indicator Meaning The ac power adapter is attached to the computer. The battery status indicator is off: The battery pack of the computer is fully charged or detached. 11 Sleep (standby for WindowsXP) status Green: The computer is in sleep (standby) mode. Blink...

Chapter 6. Fn key combinations The following table shows the function of each combination of Fn with a function key. Table 8. Fn key combinations Key combination Description Fn+F1 Reserved. Fn+F2 Lock the computer. Fn+F3 Select a power plan (in Windows XP, power scheme) that has been created by Powe...

Chapter 7. FRU replacement notices This chapter presents notices related to removing and replacing parts. Read this chapter carefully beforereplacing any FRU. External CRU statement to customers : Some problems with your product can be resolved with a replacement part you can install yourself, calle...

• Torque driver If you have a torque driver, refer to the “Torque” column for each step. • Make sure that you use the correct screw. If you have a torque screwdriver, tighten all screws firmly to the torque shown in the table. Never use a screw that you removed. Use a new one. Make sure that all of ...

MTM on rear label: TTTT-CTO S/N SSSSSSS Product ID on rear label: TTTT-MMM (Use this number when setting SerialNumber) In the example, the Serial Number to be input is “1STTTTMMMSSSSSSS”. Retaining the UUID The Universally Unique Identifier (UUID) is a 128-bit number uniquely assigned to your comput...

Chapter 8. Removing and replacing a FRU This chapter presents directions and drawings for use in removing and replacing a FRU. External CRU statement to customers : Some problems with your product can be resolved with a replacement part you can install yourself, calleda “Customer Replaceable Unit” o...

1010 Battery pack Important notice for replacing a battery pack: Lenovo ThinkVantage Toolbox (in Windows 7) has an automatic battery diagnostic that determines if thebattery pack is defective. A battery pack FRU should not be replaced unless this diagnostic shows thatthe battery is defective. The on...

1020 ExpressCard blank bezel Removal steps of ExpressCard blank bezel When you press the ExpressCard blank bezel 1 , it pops out 2 . 1 2 When installing: Make sure that the bezel is correctly oriented as shown in the following figure. 64 ThinkPad T420 and T420i Hardware Maintenance Manual

1030 Serial Ultrabay Enhanced device or travel bezel For access, remove this FRU:• “1010 Battery pack” on page 63 Removal steps of Serial Ultrabay Enhanced device or travel bezel Holding the bay lock latch in the unlocked position 1 , slide the bay eject latch in the direction shown by arrow 2 , and...

1040 Hard disk drive (HDD) and solid state drive (SSD) For access, remove this FRU:• “1010 Battery pack” on page 63 Attention: • Do not drop the drive or apply any physical shock to it. The drive is sensitive to physical shock. Improper handling can cause damage and permanent loss of data. • Before ...

When installing: Make sure that SSD spacers or HDD rubber rails are attached firmly. 68 ThinkPad T420 and T420i Hardware Maintenance Manual

1050 DIMM slot cover For access, remove this FRU:• “1010 Battery pack” on page 63 Removal steps of DIMM slot cover Note: Loosen the screw 1 , but do not remove it. 2 Chapter 8 . Removing and replacing a FRU 69

1060 DIMM (in the slot on the underside of the computer) For access, remove these FRUs in order:• “1010 Battery pack” on page 63 • “1050 DIMM slot cover” on page 69 Note: Your computer has two DIMM slots: one under the keyboard and another on the underside of the computer. If you install a DIMM in o...

1070 PCI Express Mini Card for wireless WAN For access, remove these FRUs in order:• “1010 Battery pack” on page 63 • “1050 DIMM slot cover” on page 69 Removal steps of PCI Express Mini Card for wireless WAN In step 1 , unplug the jacks by using the removal tool antenna RF connector (P/N: 08K7159), ...

3 Note: Plug the yellow cable into the jack labeled MAIN , and the blue cable into the jack labeled AUX on the card. If the computer you are servicing is a wireless WAN-ready model and does not have a wireless WAN card,route the antenna cables and secure them with a tape as shown in the following fi...

1080 Keyboard For access, remove these FRUs in order:• “1010 Battery pack” on page 63 • “1050 DIMM slot cover” on page 69 Removal steps of keyboard 1 Step Screw (quantity) Color Torque 1 M2 × 10 mm, wafer-head, nylon-coated (1) Silver 0.181 Nm(1.85 kgfcm) Push down the keyboard a little and slide it...

Lift the keyboard a little in the direction shown by arrow 3 , and then detach the connector 4 . Installation steps of keyboard When installing the keyboard, do the following: 1. Attach the keyboard connector. 74 ThinkPad T420 and T420i Hardware Maintenance Manual

2. Attach the keyboard so that the keyboard edges a are under the frame. 3. To make sure that the front edge of the keyboard is housed firmly, gently press the keys with your palms and slightly slide the keyboard toward you until it snaps into position. Chapter 8 . Removing and replacing a FRU 75

4. Make sure that the front edge of the keyboard b is attached firmly. b b b 5. Secure the keyboard by tightening the screws from the bottom side of the computer. 76 ThinkPad T420 and T420i Hardware Maintenance Manual

1090 DIMM (in the slot under the keyboard) For access, remove these FRUs in order:• “1010 Battery pack” on page 63 • “1050 DIMM slot cover” on page 69 • “1080 Keyboard” on page 73 Note: Your computer has two DIMM slots: one under the keyboard and another on the underside of the computer. If you inst...

1100 Backup battery For access, remove these FRUs in order:• “1010 Battery pack” on page 63 • “1050 DIMM slot cover” on page 69 • “1080 Keyboard” on page 73 Removal steps of backup battery DANGER Use only the battery specified in the parts list for your computer. Any other battery could igniteor exp...

1110 PCI Express Mini Card for wireless LAN For access, remove these FRUs in order:• “1010 Battery pack” on page 63 • “1050 DIMM slot cover” on page 69 • “1080 Keyboard” on page 73 Removal steps of PCI Express Mini Card for wireless LAN In step 1 , unplug the jacks by using the removal tool antenna ...

1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card For access, remove these FRUs in order:• “1010 Battery pack” on page 63 • “1020 ExpressCard blank bezel” on page 64 • “1050 DIMM slot cover” on page 69 • “1080 Keyboard” on page 73 Note: The FPC cable is attached on the underside ...

7 6 When installing: Make sure that the connector is attached firmly. Chapter 8 . Removing and replacing a FRU 85

1 7 1 7 When installing: Make sure that the connectors are attached firmly. 1 8 1 9 Step Screw (quantity) Color Torque 13 M2 × 3 mm, wafer-head, nylon-coated (1) Black 0.181 Nm(1.85 kgfcm) 86 ThinkPad T420 and T420i Hardware Maintenance Manual

1130 SmartCard For access, remove these FRUs in order:• “1010 Battery pack” on page 63 • “1050 DIMM slot cover” on page 69 • “1080 Keyboard” on page 73 • “1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card” on page 83 Removal steps of SmartCard 1 1 Step Screw (quantity) Color Torq...

When installing: Make sure that the connector is attached firmly. Removal steps of SmartCard dummy spacer Some models have a SmartCard dummy spacer as a miscellaneous part. For those models, remove thespacer as shown: 1 1 2 Step Screw (quantity) Color Torque 1 M2 × 3 mm, wafer-head, nylon-coated (2)...

1140 Modem daughter card (MDC) For access, remove these FRUs in order:• “1010 Battery pack” on page 63 • “1050 DIMM slot cover” on page 69 • “1080 Keyboard” on page 73 • “1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card” on page 83 Removal steps of modem daughter card (MDC) 1 1 ...

1150 Speaker assembly For access, remove these FRUs in order:• “1010 Battery pack” on page 63 • “1050 DIMM slot cover” on page 69 • “1080 Keyboard” on page 73 • “1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card” on page 83 Removal steps of speaker assembly 1 1 1 Step Screw (quan...

3 3 2 When installing: Attach the speaker assembly and route the cable as shown in the following figure, and make sure that the speaker connector is attached firmly. 92 ThinkPad T420 and T420i Hardware Maintenance Manual

1160 LCD unit For access, remove these FRUs in order:• “1010 Battery pack” on page 63 • “1020 ExpressCard blank bezel” on page 64 • “1050 DIMM slot cover” on page 69 • “1070 PCI Express Mini Card for wireless WAN” on page 71 • “1080 Keyboard” on page 73 • “1110 PCI Express Mini Card for wireless LAN...

Step Screw (quantity) Color Torque 6 M2.5 × 6 mm, wafer-head, nylon-coated (2) Black 0.392 Nm(4.0 kgfcm) 7 7 8 7 When installing: • Make sure that you attach the connectors firmly. • Make sure that you route the cables correctly and you tape up in the proper positions as shown in the above figure. •...

1170 Fan assembly For access, remove these FRUs in order:• “1010 Battery pack” on page 63 • “1020 ExpressCard blank bezel” on page 64 • “1050 DIMM slot cover” on page 69 • “1070 PCI Express Mini Card for wireless WAN” on page 71 • “1080 Keyboard” on page 73 • “1110 PCI Express Mini Card for wireless...

1a 1d 1b 1c Step Screw (quantity) Color Torque 1 Capture shoulder screw (4) Silver 0.181 Nm(1.85 kgfcm) 2 M2 × 3 mm, wafer-head, nylon-coated (1) black 0.181 Nm(1.85 kgfcm) For Discrete Graphics models : 4 3 98 ThinkPad T420 and T420i Hardware Maintenance Manual

For Integreted Graphics models : 2 3 When installing: • Before you attach the fan assembly to the computer, apply thermal grease, at an amount of 0.2 grams, on the parts marked a as in the following figures. Either too much or too less application of grease can cause a thermal problem due to imperfe...

1180 CPU For access, remove these FRUs in order:• “1010 Battery pack” on page 63 • “1020 ExpressCard blank bezel” on page 64 • “1050 DIMM slot cover” on page 69 • “1070 PCI Express Mini Card for wireless WAN” on page 71 • “1080 Keyboard” on page 73 • “1110 PCI Express Mini Card for wireless LAN” on ...

1190 Base cover assembly and DC-in connector cable For access, remove these FRUs in order:• “1010 Battery pack” on page 63 • “1020 ExpressCard blank bezel” on page 64 • “1030 Serial Ultrabay Enhanced device or travel bezel” on page 65 • “1040 Hard disk drive (HDD) and solid state drive (SSD)” on pag...

7 Step Screw (quantity) Color Torque 7 M2 × 3 mm, wafer-head, nylon-coated (1) Black 0.181 Nm(1.85 kgfcm) Note: Applying labels to the base cover The new base cover FRU is shipped with a kit containing labels of several kinds. When you replace the base cover, you need to apply the following label: 1...

1200 Magnesium structure frame For access, remove these FRUs in order:• “1010 Battery pack” on page 63 • “1020 ExpressCard blank bezel” on page 64 • “1030 Serial Ultrabay Enhanced device or travel bezel” on page 65 • “1040 Hard disk drive (HDD) and solid state drive (SSD)” on page 66 • “1050 DIMM sl...

1210 System board and ExpressCard slot assembly For access, remove these FRUs in order:• “1010 Battery pack” on page 63 • “1020 ExpressCard blank bezel” on page 64 • “1030 Serial Ultrabay Enhanced device or travel bezel” on page 65 • “1040 Hard disk drive (HDD) and solid state drive (SSD)” on page 6...

c Platform Controller Hub (PCH) d Graphic Processing Unit (GPU) (Discrete graphics chip) Note: The GPU d is only for models with switchable graphics. Models with integrated graphics do not have a GPU on the system board. For Switchable Graphics models: b c a d For Integrated Graphics models: b c a 1...

Step Screw (quantity) Color Torque 1 M2 × 3 mm, wafer-head, nylon-coated (1) Black 0.181 Nm(1.85 kgfcm) 2 When installing: Make sure that the connector is attached firmly. 1220 mSATA solid state drive For access, remove these FRUs in order:• “1010 Battery pack” on page 63 • “1050 DIMM slot cover” on...

Removal steps of mSATA solid state drive 1 Step Screw (quantity) Color Torque 1 M2 × 3 mm, wafer-head, nylon-coated (1) Black 0.181 Nm(1.85 kgfcm) 2 Chapter 8 . Removing and replacing a FRU 111

2010 LCD bezel assembly For access, remove the following FRU:• “1010 Battery pack” on page 63 Removal steps of LCD bezel assembly 1 1 1 1 1 1 2 112 ThinkPad T420 and T420i Hardware Maintenance Manual

2020 LED board For access, remove these FRUs in order:• “1010 Battery pack” on page 63 • “2010 LCD bezel assembly” on page 112 Removal steps of LED board 1 Step Screw (quantity) Color Torque 1 M2 × 3 mm, flat-head, nylon-coated (1) Black 0.181 Nm(1.85 kgfcm) Chapter 8 . Removing and replacing a FRU ...

2030 Integrated camera For access, remove these FRUs in order:• “1010 Battery pack” on page 63 • “2010 LCD bezel assembly” on page 112 Removal steps of integrated camera 1 Step Screw (quantity) Color Torque 1 M2 × 3 mm, flat-head, nylon-coated (1) Black 0.181 Nm(1.85 kgfcm) Chapter 8 . Removing and ...

2040 LCD panel and LCD cable For access, remove these FRUs in order:• “1010 Battery pack” on page 63 • “1020 ExpressCard blank bezel” on page 64 • “1050 DIMM slot cover” on page 69 • “1070 PCI Express Mini Card for wireless WAN” on page 71 • “1080 Keyboard” on page 73 • “1110 PCI Express Mini Card f...

2050 Camera cable For access, remove these FRUs in order:• “1010 Battery pack” on page 63 • “1020 ExpressCard blank bezel” on page 64 • “1050 DIMM slot cover” on page 69 • “1070 PCI Express Mini Card for wireless WAN” on page 71 • “1080 Keyboard” on page 73 • “1110 PCI Express Mini Card for wireless...

2070 Hinges and LCD rear cover assembly For access, remove these FRUs in order:• “1010 Battery pack” on page 63 • “1020 ExpressCard blank bezel” on page 64 • “1050 DIMM slot cover” on page 69 • “1070 PCI Express Mini Card for wireless WAN” on page 71 • “1080 Keyboard” on page 73 • “1110 PCI Express ...

Chapter 9. Locations This chapter presents the locations of ThinkPad T420 and T420i hardware components. Front view 1 Integrated camera (for some models) 2 ThinkLight 3 Built-in microphone 4 Built-in speakers 5 Security keyhole 6 Universal serial bus (USB)/eSATA combo connector 7 USB connector 8 Med...

Rear view 1 Status indicators Note: For the description of each indicator, see Chapter 5 “Status indicators” on page 49. 2 SmartCard slot 3 DisplayPort connector 4 USB connector 5 RJ-45 (Ethernet) connector 6 External monitor connector 7 Power jack 8 USB connector 9 Modem connector or IEEE 1394 5 6 ...

Bottom view 1 Battery pack 2 Battery pack latch 3 DIMM slot 4 Docking connector 5 LCD cover latch 6 Serial Ultrabay Enhanced lock latch 7 Serial Ultrabay Enhanced eject latch 6 7 5 1 2 3 4 128 ThinkPad T420 and T420i Hardware Maintenance Manual

Chapter 10. Parts list This chapter contains following lists of the service parts.• “Overall” on page 130 • “LCD FRUs” on page 150 • “Keyboard” on page 154 • “Miscellaneous parts” on page 156 • “Information about ac power adapters” on page 158 • “Power cords” on page 159 • “Recovery discs” on page 1...

Overall 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 3 19 18 20 21 22 23 24 25 26 27 28 29 30 17 16 c a b 130 ThinkPad T420 and T420i Hardware Maintenance Manual

Table 9. Parts list—Overall No. FRU (Overall) FRU no. CRU ID a - c See “Miscellaneous parts” on page 156. 1 LCD unit (see “LCD FRUs” on page 150.) 2 ThinkPad b/g/n Wireless (1x1 BGN)• 4177-CTO, 25x, 26x, 27x, 28x, 29x, 2Ax, 2Bx, 2Cx, 2Dx, 2Ex, 2Fx, 2Gx, 2Kx, 2Lx, 2Mx, 2Xx, 2Yx, 36x, GFx, GKx, GLx, G...

LCD FRUs 1 2 3 4 5 6 7 8 9 10 Table 10. Parts list—LCD FRUs No. FRU FRU no. CRUID a, b See “Miscellaneous parts” on page 156. 1 LCD bezel assembly 04W1609 N 150 ThinkPad T420 and T420i Hardware Maintenance Manual

Keyboard Table 11. Parts list—Keyboard Language FRU no. CRUID Arabic 45N2076 45N2146 45N2216 Belgian 45N2077 45N2147 45N2217 Brazilian Portuguese 45N2075 45N2145 45N2215 Bulgarian 45N2078 45N2148 45N2218 Canadian French (058) 45N2073 45N2143 45N2213 Canadian French (Acnor) 45N2072 45N2142 45N2212 Cz...

Miscellaneous parts Table 12. Parts list—Miscellaneous parts FRU FRU no. CRUID Screw and seal kit:• M2 × 3 mm, black (50)• M2 × 5 mm, black (20)• M2 × 8 mm, black (15)• M2 × 10 mm, Silver (4)• M2 × 15 mm, black (8)• M2.5 × 4 mm, black (8)• M2.5 × 6 mm, black (8)• M2 (shoulder), black (4)• Hex stud, ...

Information about ac power adapters Table 13. Parts list—2-pin ac power adapters FRU FRU no. CRUID 2-pin (65 W, 20 V) adapter (models CTO, xxE, xxF, xxJ, xxL, xxP, xxS, xxU, xxY) 42T5282 2-pin (65 W, 20 V) adapter (models CTO, xxE, xxF, xxJ, xxL, xxP, xxS, xxU, xxY) 42T4423 2-pin (65 W, 20 V) adapte...

Power cords A ThinkPad power cord for a specific country or region is usually available only in that country or region: Table 15. Parts list—2-pin power cords Country or region FRU no. CRUID Argentina• models -CTO, xxY 42T5020 42T5105 Brazil• models -CTO, xxP 42T5180 42T5183 Canada, U.S.• models -CT...

Recovery discs Windows XP Professional DVDs Note: The Windows XP Professional recovery DVDs are available only for models with a valid Microsoft Windows XP Professional certificate of authenticity (COA) affixed to the system. Due to a Microsoft licensinglimitation, if a model came with Windows XP Pr...

Windows Vista Home Basic (32 bit) SP2 DVDs Note: The Windows Vista recovery DVDs are available only for models with a valid Microsoft Windows Vista certificate of authenticity (COA) affixed to the system. Due to a Microsoft licensing limitation, if a model camewith Windows Vista Business or Windows ...

Common service tools Table 27. Parts list—Common service tools Tool P/N Screwdriver kit 95F3598 1/4" drive spinner handle 1650840 1/4" Sq. to 1/4" hex torx adapter 93F2838 TR7-TR-10 tamper resistant torx bits 00P6967 Removal tool antenna RF connector 08K7159 USB 2.0 CD-RW/DVD-ROM combo d...

Electronic emissions notices For electronic emission information on Class B digital devices, refer to the corresponding information inthe User Guide . 168 ThinkPad T420 and T420i Hardware Maintenance Manual

Trademarks The following terms are trademarks of Lenovo in the United States, other countries or both: Active Protection SystemLenovoThinkLightThinkPadThinkVantageTrackPointUltrabay The following terms are trademarks of Microsoft group of companies: WindowsMicrosoft The following terms are trademark...