Hardware Maintenance Manual
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... assembly, FPC cable, and Bluethooth daughter card 87 1130 SmartCard 92 1140 Modem daughter card (MDC 94 © Copyright Lenovo 2012 i Removing and replacing a FRU 65 Before servicing ThinkPad T420 and T420i . . . 66 1010 Battery pack 67 1020 ExpressCard blank bezel 68 1030 Serial Ultrabay Enhanced device or travel bezel 69 1040 Hard disk drive...
... assembly, FPC cable, and Bluethooth daughter card 87 1130 SmartCard 92 1140 Modem daughter card (MDC 94 © Copyright Lenovo 2012 i Removing and replacing a FRU 65 Before servicing ThinkPad T420 and T420i . . . 66 1010 Battery pack 67 1020 ExpressCard blank bezel 68 1030 Serial Ultrabay Enhanced device or travel bezel 69 1040 Hard disk drive...
Hardware Maintenance Manual
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... and retains a charge even when you use of the ac plug on ac-operated computers. When working on a double-insulated or battery-operated system, use coax or connector-outside shells on your body. • Prevent the part from touching your clothing. Note: The... wrist strap against ESD damage is required for operator safety and correct system function. You can be verified by a certified electrician. 4 ThinkPad T420 and T420i Hardware Maintenance Manual Use product-specific ESD procedures when they are wearing a wrist strap. • Use a grounded work surface. Proper grounding...
... and retains a charge even when you use of the ac plug on ac-operated computers. When working on a double-insulated or battery-operated system, use coax or connector-outside shells on your body. • Prevent the part from touching your clothing. Note: The... wrist strap against ESD damage is required for operator safety and correct system function. You can be verified by a certified electrician. 4 ThinkPad T420 and T420i Hardware Maintenance Manual Use product-specific ESD procedures when they are wearing a wrist strap. • Use a grounded work surface. Proper grounding...
Hardware Maintenance Manual
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Seek medical care if any symptoms from electrical outlets, remove the battery pack, and disconnect any interconnecting cables. 6 ThinkPad T420 and T420i Hardware Maintenance Manual DANGER Though the main batteries have low voltage, a shorted or grounded battery can produce enough current to burn personnel or combustible materials. DANGER Unless hot swap is allowed for at least 15...
Seek medical care if any symptoms from electrical outlets, remove the battery pack, and disconnect any interconnecting cables. 6 ThinkPad T420 and T420i Hardware Maintenance Manual DANGER Though the main batteries have low voltage, a shorted or grounded battery can produce enough current to burn personnel or combustible materials. DANGER Unless hot swap is allowed for at least 15...
Hardware Maintenance Manual
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... must be able to the Power Manager Battery Gauge icon in the icon tray of battery power remaining is still less than +11.0 V dc, the battery pack has been discharged. Checking the backup battery Do the following figure. 38 ThinkPad T420 and T420i Hardware Maintenance Manual Remove the backup battery (see "1010 Battery pack" on page 83). 5. If the...
... must be able to the Power Manager Battery Gauge icon in the icon tray of battery power remaining is still less than +11.0 V dc, the battery pack has been discharged. Checking the backup battery Do the following figure. 38 ThinkPad T420 and T420i Hardware Maintenance Manual Remove the backup battery (see "1010 Battery pack" on page 83). 5. If the...
Hardware Maintenance Manual
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...board. 1. Reseat the hard disk drive. 2. Mini SATA device. 3. System board. 48 ThinkPad T420 and T420i Hardware Maintenance Manual Run the ThinkPad Setup program, and then save the current setting by pressing F10. 2. System board. 1. ...Reseat the Mini SATA device. 2. Reseat the hard disk drive. 2. Check date and time settings. 1802 Unauthorized network card is plugged in sequence 1. System board. 1. Replace the backup battery and run the ThinkPad...
...board. 1. Reseat the hard disk drive. 2. Mini SATA device. 3. System board. 48 ThinkPad T420 and T420i Hardware Maintenance Manual Run the ThinkPad Setup program, and then save the current setting by pressing F10. 2. System board. 1. ...Reseat the Mini SATA device. 2. Reseat the hard disk drive. 2. Check date and time settings. 1802 Unauthorized network card is plugged in sequence 1. System board. 1. Replace the backup battery and run the ThinkPad...
Hardware Maintenance Manual
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... computer. 5. DIMM h. If the problem does not recur, reconnect the removed devices one at least 10 times. 2. LCD assembly 52 ThinkPad T420 and T420i Hardware Maintenance Manual Rerun the test to isolate the failing FRU (do with a hardware defect, such as cosmic radiation, electrostatic discharge, or...until you find the failing FRU. 7. Devices attached to do not isolate FRUs that have nothing to the docking station or the port replicator c. Battery pack e. Optical disk or diskette in loop mode at a time (do the following: 1. Determine whether the problem has been solved. 6. ...
... computer. 5. DIMM h. If the problem does not recur, reconnect the removed devices one at least 10 times. 2. LCD assembly 52 ThinkPad T420 and T420i Hardware Maintenance Manual Rerun the test to isolate the failing FRU (do with a hardware defect, such as cosmic radiation, electrostatic discharge, or...until you find the failing FRU. 7. Devices attached to do not isolate FRUs that have nothing to the docking station or the port replicator c. Battery pack e. Optical disk or diskette in loop mode at a time (do the following: 1. Determine whether the problem has been solved. 6. ...
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Status indicators (continued) Indicator 11 Sleep (standby for Windows XP) status Meaning The ac power adapter is fully charged or detached. The battery status indicator is off: The battery pack of the computer is attached to the computer. Blinking green: The computer is entering sleep (standby) mode or hibernation mode, or is in sleep (standby) mode. Table 7. Green: The computer is resuming normal operation. 56 ThinkPad T420 and T420i Hardware Maintenance Manual
Status indicators (continued) Indicator 11 Sleep (standby for Windows XP) status Meaning The ac power adapter is fully charged or detached. The battery status indicator is off: The battery pack of the computer is attached to the computer. Blinking green: The computer is entering sleep (standby) mode or hibernation mode, or is in sleep (standby) mode. Table 7. Green: The computer is resuming normal operation. 56 ThinkPad T420 and T420i Hardware Maintenance Manual
Hardware Maintenance Manual
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If the computer you are servicing might have the SIM card that you insert the card back into the slot firmly. 2 1 66 ThinkPad T420 and T420i Hardware Maintenance Manual To remove the SIM card, you need to remove the battery pack first. (See "1010 Battery pack" on page 67.) After you finish the servicing, make sure that the customer has installed. Before servicing ThinkPad T420 and T420i Some models of the ThinkPad T420 and T420i you are servicing has the SIM card, remove it before you start the servicing.
If the computer you are servicing might have the SIM card that you insert the card back into the slot firmly. 2 1 66 ThinkPad T420 and T420i Hardware Maintenance Manual To remove the SIM card, you need to remove the battery pack first. (See "1010 Battery pack" on page 67.) After you finish the servicing, make sure that the customer has installed. Before servicing ThinkPad T420 and T420i Some models of the ThinkPad T420 and T420i you are servicing has the SIM card, remove it before you start the servicing.
Hardware Maintenance Manual
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... solid state drive (SSD) For access, remove this FRU: • "1010 Battery pack" on it if possible. • Never remove the drive while the system is operating or is sensitive to it . 4 4 1 2 Step 1 Screw (quantity) Capture screw (1) 70 ThinkPad T420 and T420i Hardware Maintenance Manual Color Black Torque 0.181 Nm (1.85 kgfcm) The drive...
... solid state drive (SSD) For access, remove this FRU: • "1010 Battery pack" on it if possible. • Never remove the drive while the system is operating or is sensitive to it . 4 4 1 2 Step 1 Screw (quantity) Capture screw (1) 70 ThinkPad T420 and T420i Hardware Maintenance Manual Color Black Torque 0.181 Nm (1.85 kgfcm) The drive...
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... of the DIMM into place. 1060 DIMM (in the slot on the underside of the computer) For access, remove these FRUs in order: • "1010 Battery pack" on page 67 • "1050 DIMM slot cover" on page 73 Note: Your computer has two DIMM slots: one of the two slots, install... of the computer) 1 2 1 When installing: Insert the notched end of the computer. If you install a DIMM in the slot and does not move easily. 74 ThinkPad T420 and T420i Hardware Maintenance Manual
... of the DIMM into place. 1060 DIMM (in the slot on the underside of the computer) For access, remove these FRUs in order: • "1010 Battery pack" on page 67 • "1050 DIMM slot cover" on page 73 Note: Your computer has two DIMM slots: one of the two slots, install... of the computer) 1 2 1 When installing: Insert the notched end of the computer. If you install a DIMM in the slot and does not move easily. 74 ThinkPad T420 and T420i Hardware Maintenance Manual
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1130 SmartCard For access, remove these FRUs in order: • "1010 Battery pack" on page 67 • "1050 DIMM slot cover" on page 73 • "1080 Keyboard" on page 77 • "1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card" on page 87 Removal steps of SmartCard 1 1 Step 1 Screw (quantity) M2 × 3 mm, wafer-head, nylon-coated (2) 3 Color Black Torque 0.181 Nm (1.85 kgfcm) 2 92 ThinkPad T420 and T420i Hardware Maintenance Manual
1130 SmartCard For access, remove these FRUs in order: • "1010 Battery pack" on page 67 • "1050 DIMM slot cover" on page 73 • "1080 Keyboard" on page 77 • "1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card" on page 87 Removal steps of SmartCard 1 1 Step 1 Screw (quantity) M2 × 3 mm, wafer-head, nylon-coated (2) 3 Color Black Torque 0.181 Nm (1.85 kgfcm) 2 92 ThinkPad T420 and T420i Hardware Maintenance Manual
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1140 Modem daughter card (MDC) For access, remove these FRUs in order: • "1010 Battery pack" on page 67 • "1050 DIMM slot cover" on page 73 • "1080 Keyboard" on page 77 • "1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card" on page 87 Removal steps of modem daughter card (MDC) 1 1 2 Step 1 Screw (quantity) M2 × 3 mm, wafer-head, nylon-coated (2) Color Black When installing: Make sure that the connector is attached firmly. Torque 0.181 Nm (1.85 kgfcm) 94 ThinkPad T420 and T420i Hardware Maintenance Manual
1140 Modem daughter card (MDC) For access, remove these FRUs in order: • "1010 Battery pack" on page 67 • "1050 DIMM slot cover" on page 73 • "1080 Keyboard" on page 77 • "1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card" on page 87 Removal steps of modem daughter card (MDC) 1 1 2 Step 1 Screw (quantity) M2 × 3 mm, wafer-head, nylon-coated (2) Color Black When installing: Make sure that the connector is attached firmly. Torque 0.181 Nm (1.85 kgfcm) 94 ThinkPad T420 and T420i Hardware Maintenance Manual
Hardware Maintenance Manual
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1190 Base cover assembly and DC-in connector cable For access, remove these FRUs in order: • "1010 Battery pack" on page 67 • "1020 ExpressCard blank bezel" on page 68 • "1030 Serial Ultrabay Enhanced device or travel bezel" on page 69 • "... cover assembly and DC-in connector cable 1 1 1 1 1 Step 1 Screw (quantity) M2 × 8 mm, wafer-head, nylon-coated (5) Color Black Torque 0.181 Nm (1.85 kgfcm) 106 ThinkPad T420 and T420i Hardware Maintenance Manual
1190 Base cover assembly and DC-in connector cable For access, remove these FRUs in order: • "1010 Battery pack" on page 67 • "1020 ExpressCard blank bezel" on page 68 • "1030 Serial Ultrabay Enhanced device or travel bezel" on page 69 • "... cover assembly and DC-in connector cable 1 1 1 1 1 Step 1 Screw (quantity) M2 × 8 mm, wafer-head, nylon-coated (5) Color Black Torque 0.181 Nm (1.85 kgfcm) 106 ThinkPad T420 and T420i Hardware Maintenance Manual
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1200 Magnesium structure frame For access, remove these FRUs in order: • "1010 Battery pack" on page 67 • "1020 ExpressCard blank bezel" on page 68 • "1030 Serial Ultrabay Enhanced device or travel bezel" on page 69 • "... and DC-in connector cable" on page 106 Removal steps of magnesium structure frame 1 2 2 3 3 5 Step 2 Screw (quantity) M2 × 5 mm, wafer-head, nylon-coated (2) 110 ThinkPad T420 and T420i Hardware Maintenance Manual 4 4 Color Black Torque 0.181 Nm (1.85 kgfcm)
1200 Magnesium structure frame For access, remove these FRUs in order: • "1010 Battery pack" on page 67 • "1020 ExpressCard blank bezel" on page 68 • "1030 Serial Ultrabay Enhanced device or travel bezel" on page 69 • "... and DC-in connector cable" on page 106 Removal steps of magnesium structure frame 1 2 2 3 3 5 Step 2 Screw (quantity) M2 × 5 mm, wafer-head, nylon-coated (2) 110 ThinkPad T420 and T420i Hardware Maintenance Manual 4 4 Color Black Torque 0.181 Nm (1.85 kgfcm)
Hardware Maintenance Manual
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... HDD Active Protection System™ still functions. 1210 System board and ExpressCard slot assembly For access, remove these FRUs in order: • "1010 Battery pack" on page 67 • "1020 ExpressCard blank bezel" on page 68 • "1030 Serial Ultrabay Enhanced device or travel bezel" on page... • "1190 Base cover assembly and DC-in connector cable" on page 106 Important notices for the HDD Active Protection System 112 ThinkPad T420 and T420i Hardware Maintenance Manual If the system supports PC-Doctor for DOS, after replacing the system board, run PC-Doctor for DOS, to make...
... HDD Active Protection System™ still functions. 1210 System board and ExpressCard slot assembly For access, remove these FRUs in order: • "1010 Battery pack" on page 67 • "1020 ExpressCard blank bezel" on page 68 • "1030 Serial Ultrabay Enhanced device or travel bezel" on page... • "1190 Base cover assembly and DC-in connector cable" on page 106 Important notices for the HDD Active Protection System 112 ThinkPad T420 and T420i Hardware Maintenance Manual If the system supports PC-Doctor for DOS, after replacing the system board, run PC-Doctor for DOS, to make...
Hardware Maintenance Manual
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... the drive while the system is operating or is attached firmly. 1220 mSATA solid state drive For access, remove these FRUs in order: • "1010 Battery pack" on page 67 • "1050 DIMM slot cover" on it . Improper handling can cause damage and permanent loss of data. • Before removing the... × 3 mm, wafer-head, nylon-coated (1) Color Black Torque 0.181 Nm (1.85 kgfcm) 2 When installing: Make sure that the connector is in suspend mode. 114 ThinkPad T420 and T420i Hardware Maintenance Manual
... the drive while the system is operating or is attached firmly. 1220 mSATA solid state drive For access, remove these FRUs in order: • "1010 Battery pack" on page 67 • "1050 DIMM slot cover" on it . Improper handling can cause damage and permanent loss of data. • Before removing the... × 3 mm, wafer-head, nylon-coated (1) Color Black Torque 0.181 Nm (1.85 kgfcm) 2 When installing: Make sure that the connector is in suspend mode. 114 ThinkPad T420 and T420i Hardware Maintenance Manual
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2010 LCD bezel assembly For access, remove the following FRU: • "1010 Battery pack" on page 67 Removal steps of LCD bezel assembly 2 1 1 1 1 1 1 116 ThinkPad T420 and T420i Hardware Maintenance Manual
2010 LCD bezel assembly For access, remove the following FRU: • "1010 Battery pack" on page 67 Removal steps of LCD bezel assembly 2 1 1 1 1 1 1 116 ThinkPad T420 and T420i Hardware Maintenance Manual
Hardware Maintenance Manual
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... assembly For access, remove these FRUs in the figure above. As you install the antenna kit, route the cables as shown in order: • "1010 Battery pack" on page 67 • "1020 ExpressCard blank bezel" on page 68 • "1050 DIMM slot cover" on page 73 • "1070 PCI Express Mini... assembly or wireless LAN/WAN antenna assembly 2 2 2 2 1 1 1 1 1 1 1 1 When installing: When you route the cables, make sure that they are not subjected to be broken. 124 ThinkPad T420 and T420i Hardware Maintenance Manual
... assembly For access, remove these FRUs in the figure above. As you install the antenna kit, route the cables as shown in order: • "1010 Battery pack" on page 67 • "1020 ExpressCard blank bezel" on page 68 • "1050 DIMM slot cover" on page 73 • "1070 PCI Express Mini... assembly or wireless LAN/WAN antenna assembly 2 2 2 2 1 1 1 1 1 1 1 1 When installing: When you route the cables, make sure that they are not subjected to be broken. 124 ThinkPad T420 and T420i Hardware Maintenance Manual
Hardware Maintenance Manual
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2070 Hinges and LCD rear cover assembly For access, remove these FRUs in order: • "1010 Battery pack" on page 67 • "1020 ExpressCard blank bezel" on page 68 • "1050 DIMM slot cover" on page 73 • "1070 PCI Express Mini ...) M2.5 × 4 mm, wafer-head, nylon-coated (4) Color Black When installing: Attach the hinges as shown in the following figure. Torque 0.392 Nm (4.0 kgfcm) 126 ThinkPad T420 and T420i Hardware Maintenance Manual
2070 Hinges and LCD rear cover assembly For access, remove these FRUs in order: • "1010 Battery pack" on page 67 • "1020 ExpressCard blank bezel" on page 68 • "1050 DIMM slot cover" on page 73 • "1070 PCI Express Mini ...) M2.5 × 4 mm, wafer-head, nylon-coated (4) Color Black When installing: Attach the hinges as shown in the following figure. Torque 0.392 Nm (4.0 kgfcm) 126 ThinkPad T420 and T420i Hardware Maintenance Manual
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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 7 6 1 2 3 4 5 132 ThinkPad T420 and T420i Hardware Maintenance Manual
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 7 6 1 2 3 4 5 132 ThinkPad T420 and T420i Hardware Maintenance Manual