v After service, reinstall all safety shields, guards, labels, and ground wires. Replace any safety device that is worn or defective. v Reinstall all covers correctly before returning the machine to the customer.

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 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 electrical shock. v Find the room emergency power-off (EPO) switch, disconnecting switch, or electrical outlet. If an electrical accident occurs, you can then operate the switch or unplug the power cord quickly. v Do not work alone under hazardous conditions or near equipment that has hazardous voltages. v Disconnect all power before: Performing a mechanical inspection Working near power supplies Removing or installing main units v Before you start to work on the machine, unplug the power cord. If you cannot unplug it, ask the customer to power-off the wall box that supplies power to the machine and to lock the wall box in the off position. v If you need to work on a machine that has exposed electrical circuits, observe the following precautions: Ensure that another person, familiar with the power-off controls, is near you. Attention: Another person must be there to switch off the power, if necessary. Use only one hand when working with powered-on electrical equipment; keep the other hand in your pocket or behind your back. Attention: An electrical shock can occur only when there is a complete circuit. By observing the above rule, you may prevent a current from passing through your body.
When using testers, set the controls correctly and use the approved probe leads and accessories for that tester. Stand on suitable rubber mats (obtained locally, if necessary) to insulate you from grounds such as metal floor strips and machine frames. Observe the special safety precautions when you work with very high voltages; these instructions are in the safety sections of maintenance information. Use extreme care when measuring high voltages. v Regularly inspect and maintain your electrical hand tools for safe operational condition. v Do not use worn or broken tools and testers. v Never assume that power has been disconnected from a circuit. First, check that it has been powered off. v Always look carefully for possible hazards in your work area. Examples of these hazards are moist floors, nongrounded power extension cables, power surges, and missing safety grounds. v Do not touch live electrical circuits with the reflective surface of a plastic dental mirror. The surface is conductive; such touching can cause personal injury and machine damage. v Do not service the following parts with the power on when they are removed from their normal operating places in a machine: Power supply units Pumps Blowers and fans Motor generators and similar units. (This practice ensures correct grounding of the units.) v If an electrical accident occurs: Use caution; do not become a victim yourself. Switch off power. Send another person to get medical aid.

Restoring the preloaded system
If the data on a hard-disk drive is damaged or accidentally erased, you can restore the software that was shipped with the computer. This software includes the pre-installed operating system, applications, and device drivers. To restore the pre-installed software, you can use either the Product Recovery program or a recovery CD.
Ordering the recovery CD When the hard-disk drive is replaced because of a failure, no Product Recovery program is on the new hard disk. In this case, you must use the Product Recovery CD for the computer. Order the recovery CD and the hard-disk drive at the same time so that you can recover the new hard-disk drive with the pre-installed software when they arrive. For information on which CD to order, see Recovery CDs on page 161 The Product Recovery program is in the service partition, a section of the hard-disk drive that is not displayed by Windows Explorer. Attention: All of the files on the primary hard-disk partition (usually drive C) will be lost in the recovery process. Be sure to back up copies of the files you have saved on your drive C before you begin.
Creating a Recovery Repair diskette
If the operating system cannot boot normally, or if you cannot get access to the Product Recovery program, you can use the Recovery Repair diskette to boot the computer. Make a Recovery Repair diskette and save it for future use. To make a Recovery Repair diskette, do the following: 1. Shut down and restart the computer. General descriptions
2. At the prompt, press F11. (The option to press F11 appears for only a few seconds. You must press F11 quickly.) The Product Recovery program main menu opens. Note: If you are prompted to select the operating system, select one you want to recover. Then the Product Recovery program main menu opens. 3. Select System Utilities from the main menu. Press Enter. 4. Select Create a Recovery Repair diskette. Press Enter. 5. Follow the on-screen instructions. 6. When the process is completed, label the diskette Recovery Repair diskette and save it for future use.

Product Recovery program

Notes v Screen blank mode is called standby mode in Windows 95 and Windows NT. v Standby mode is called suspend mode in Windows 95 and Windows NT.

Screen blank mode

Screen blank mode has three variants, as follows: 1. If you press Fn+F3, or the time set on the LCD off timer in IBM BIOS Setup Utility expires, v The LCD backlight turns off. v The hard-disk drive motor stops. v The speaker is muted. 2. If you are using the ACPI operating system and you press Fn+F3, v The LCD backlight turns off.
v The hard-disk drive motor stops. 3. If the time set on the Turn off monitor timer in the operating system expires, v The LCD backlight turns off. To end screen blank mode and resume normal operation, press any key.

Standby mode

When the computer enters standby mode, the following events occur in addition to what occurs in screen blank mode: v The LCD is powered off. v The hard-disk drive is powered off. v The CPU stops. To enter standby mode, press Fn+F4. Note: You can change the action of Fn+F4, if you are using the ACPI operating system. In certain circumstances, the computer goes into standby mode automatically: v If a suspend time has been set on the timer, and the user does not do any operation with the keyboard, the TrackPoint, the hard disk, the parallel connector, or the diskette drive within that time. v If the battery indicator blinks orange, indicating that the battery power is low. (Alternatively, if Hibernate when battery becomes low has been selected in the Power Management Properties window, the computer goes into hibernation mode.) Note for the APM operating system: Even if you do not set the low-battery alarm, the charge indicator notifies you when the battery is low, and then the computer enters the power-saving mode automatically. This default low-battery behavior is independent of the operating system; so if you have set the low-battery alarm, the computer may not do what you specified. It chooses either your setting or the default setting, whichever is appropriate. If you are using the ACPI operating system, only the low-battery alarm is available. To cause the computer to return from standby mode and resume operation, do one of the following: v Press the Fn key. v Open the LCD cover (only if you are using Windows Me and you entered standby mode by closing the LCD cover.) General descriptions

External monitor Line-in Headphone Microphone Mouse or keyboard Parallel or diskette drive Port replicator connector Serial One universal serial bus (USB) connector for T20, T21, and T22 series Two USB connectors for T23 RJ11 RJ45 (covered) TV-out
Product overview Feature Internal modem Audio Description 56.6 Kbps v Internal microphone v Internal speaker v Software control volume IrDA 1.1

Infrared transfer

802.11b (only Mini PCI Type-IIIa IEEE 802.11b wireless LAN for T23 series) card PC Card AC adapter Bay device One Type-III or two Type-II 72-watt type T20 v 1.44 MB (3-mode), 3.5-inch diskette drive v 10-24x CD-ROM drive v 6x DVD-ROM drive T21, T22, T23 v 1.44 MB (3-mode), 3.5-inch diskette drive v 10-24x CD-ROM drive v 8x DVD-ROM drive v CD-RW drive v DVD/CD-RW combo drive

Status indicators

The system status indicators show the status of the computer, as follows:

Indicator 1 Drive in use

Meaning Green: Data is being read from or written to the hard-disk drive, the diskette drive, or the drive in the Ultrabay 2000. When this indicator is on, do not put the computer into standby mode or turn off the computer.
Note: Do not move the system while the Green drive in use light is on. Sudden physical shock could cause drive errors. 2 Num lock Green: The numeric keypad on the keyboard is enabled. To enable or disable the keypad, press and hold the Fn key while pressing the NumLk key. Caps Lock mode is enabled. To enable or disable Caps Lock mode, press Fn + Caps Lock key.

3 Caps lock

Green:
Product overview Indicator 4 Scroll lock Meaning Green: Scroll Lock mode is enabled. Arrow keys can be used as screen-scroll function keys, but not to move the cursor. To enable or disable Scroll Lock mode, press Fn + ScrLk key. Not all application programs support this function. This indicator stays lighted whenever the computer is on. If the power-on indicator is on and the standby indicator is off, the system is ready to use. If both the power-on indicator and the standby indicator are on, you can use the computer after it returns from the standby mode and the standby indicator goes off.

5 Power on

6 Battery
Green: The battery is fully charged. Blinking green: The battery has enough power to operate, but is being charged. Orange: The battery power is low. The battery needs to be charged. Blinking orange: The battery needs to be charged when the indicator starts blinking orange, the computer beeps three times. The computer is in standby mode. Green: Blinking green: The computer is entering standby mode or hibernation mode, or is resuming normal operation. This indicator does not blink in Windows 2000, Windows Me, and Windows XP. Green: An Ultrabay 2000 device is installed and in use. Blinking green: An Ultrabay 2000 device is in the process of being detached. Turn off: An Ultrabay 2000 device is ready to be attached or detached. Note: If you are using Windows 2000 or Windows XP, the Ultrabay status indicator does not blink while an Ultrabay 2000 device is being detached. Instead, a message box pops up when the process is completed; then the indicator turns off.

Fn+F5 Fn+F6 Fn+F7

Fn+F9 Fn+F10 Fn+F11 Fn+F12

Fn+PgUp Fn+Home Fn+End

Symptom-to-FRU index
The symptom-to-FRU index in this section lists symptoms and errors and their possible causes. The most likely cause is listed first, in boldface type. Note: Do the FRU replacement or other actions in the sequence shown in the column headed FRU or action, in sequence. If replacing a FRU does not solve the problem, put the original part back in the computer. Do not replace a nondefective FRU. This index can also help you determine, during regular servicing, what FRUs are likely to need to be replaced next. A numeric error is displayed for each error detected in POST or system operation. In the displays, n can be any number. If no numeric code is displayed, check the narrative descriptions of symptoms. If the symptom is not described there, go to Intermittent problems on page 55.
Note For an IBM device not supported by diagnostic codes in the ThinkPad notebook computers, see the manual for that device.

Numeric error codes

Symptom or error 0175 Bad CRC1, stop POST taskThe EEPROM checksum is not correct. 0187 EAIA data access errorThe access to EEPROM is failed. 0188 Invalid RFID serialization information area or bad CRC2The EEPROM checksum is not correct. 0189 Invalid RFID configuration information areaThe EEPROM checksum is not correct. 0190 Critical low-battery error FRU or action, in sequence System board.

System board.

1. Charge the battery pack. 2. Battery pack.
Symptom-to-FRU index Symptom or error 0193 RF antenna has been removed 0194 The computer has been carried through a security gate 0195 Security hardware tamper detected FRU or action, in sequence Enter the supervisor password. Enter the supervisor password. 1. Enter IBM BIOS Setup Utility by entering supervisor password, and select Password --> IBM Security Chip --> Clear IBM Security Chip to clear this error. 2. Security chip. 3. System board. 1. Enter IBM BIOS Setup Utility by entering supervisor password, and select Password --> IBM Security Chip --> Clear IBM Security Chip to clear this error. 2. Security chip. 3. System board. The remote configuration for the security chip has failed. Confirm the operation and try again.
0196 Security hardware removed
0197 Invalid remote change requested
01C9 1. Remove the Ethernet More than one Ethernet devices device that you installed; are found. Remove one of or press Esc to ignore the them. Press <Esc> to continue. warning message. 2. System board. 0200 Hard disk errorThe hard disk is not working. 1. Reseat the hard-disk drive. 2. Load Setup Defaults in IBM BIOS Setup Utility. 3. Hard-disk drive. 4. System board. Run interactive tests of the keyboard and the auxiliary input device. Load Setup Defaults in IBM BIOS Setup Utility.
021x Keyboard error 0220 Monitor type errorMonitor type does not match the one specified in CMOS. 0230 Shadow RAM errorShadow RAM fails at offset nnnn. 0231 System RAM errorSystem RAM fails at offset nnnn.

One long and two short beeps, and a blank or unreadable LCD. Two short beeps with error codes. Two short beeps and a blank screen. Two or more beeps, or a continuous beep. Operating system starts successfully. Three short beeps, pause, three more short beeps, and one short beep. One short beep, pause, three short beeps, pause, three more short beeps, and one short beep. Only cursor appears.
Reinstall operating system.

No-beep symptoms

Symptom or error No beep, power-on indicator on, LCD blank, and no POST. FRU or action, in sequence 1. Make sure that every connector is connected tightly and correctly. 2. DIMM. 3. System board. 1. Reseat DIMM. 2. System board. A power-on password or a supervisor password is set. Type the password and press Enter. A hard-disk password is set. Type the password and press Enter. Start the ThinkPad Configuration program and set the Screen expansion function.
No beep, power-on indicator on, and LCD blank during POST. The power-on password prompt appears.
The hard-disk password prompt appears. The DOS full screen looks smaller.

LCD-related symptoms

Important The TFT LCD for the notebook computer contains many thin-film transistors (TFTs). A small number of dots that are missing, discolored, or always lighted is characteristic of TFT LCD technology, but excessive pixel problems can cause viewing concerns. The LCD should be replaced if the number of missing, discolored, or lighted dots in any background is: v XGA: 8 or more bright dots, 8 or more dark dots, or a total of 9 or more bright and dark dots. v SXGA+: 11 or more bright dots, 13 or more dark dots, or a total of 16 or more bright and dark dots. Note: A bright dot means a pixel is always on (white or color.) A dark dot means a pixel is always off (black color.)
Symptom or error No beep, power-on indicator on, and a blank LCD during POST. v LCD backlight not working. v LCD too dark. v LCD brightness cannot be adjusted. v LCD contrast cannot be adjusted. v v v v LCD screen unreadable. Characters missing pixels. Screen abnormal. Wrong color displayed. FRU or action, in sequence System board.

1020 Backup battery

For access, remove this FRU: v 1010 Battery pack on page 60

Step 1

Screw (quantity) M2.5 3.5 mm, (1)
Torque 0.392 Nm (4 kgfcm)
Cable routing: When attaching the backup battery to the holder, route the battery cable as in the following figure.

1030 Hard-disk drive

Attention Do not drop or apply any shock to the hard-disk drive. The hard-disk drive is sensitive to physical shock. Incorrect handling can cause damage and permanent loss of data. Before removing the drive, have the user make a backup copy of all the information on the drive if possible. Never remove the drive while the system is operating or is in suspend mode. For access, remove this FRU: v 1010 Battery pack on page 60
Note: The hard disk is attached to the cover.
Step 1 Screw (quantity) Coin screw (1) or security screw (1)
Note: Use a 2.5-mm Allen wrench to remove the security screw.
When removing the hard-disk drive, open the LCD a little as shown in the figure.
When installing: Make sure that the HDD connector is firmly connected.

1040 DIMM

For access, remove this FRU: v 1010 Battery pack on page 60 Note: Loosen the screw 1 , but do not remove it.
When installing: With the notched end of the DIMM toward the socket, insert the DIMM into the socket, and then press it firmly. Pivot the DIMM until it snaps into place. Make sure that the card is firmly fixed in the slot and does not move easily. ThinkPad T20, T21, T22 and T23 series

1050 Mini PCI adapter

For T20, T21 and T22 series
Note: Loosen the screw 1 , but do not remove it.
Note: The following illustration shows the combo card. Connector (A) is for the LAN feature and (B) is for the modem feature. Disconnect either (A) or (B) in step 6. This slot also supports a Mini PCI modem card or Mini PCI network card.

(B) (A) 4

(B) (A)
When installing: Make sure not to pinch the connector cable when re-installing the Mini PCI adapter.

(B) (C)

2. Insert your fingers into the PC Card slot on the left of the computer and the Ultrabay 2000 slot on the right of the computer as shown in 1. Then, with your fingers in those slots as in 2 , latch the keyboard in place by using your thumbs to press firmly on the shift keys. Press the Y key to connect the keyboard to the connector on the underside of the key 3.
3. To make sure that the front side of the keyboard is housed firmly, gently press the shift keys with your thumbs and try to slide the keyboard towards you. Do not push parts (A) and (B) on the keyboard strongly; to do so might cause distortion of the Ultrabay 2000 slot and the PC Card slot.
4. Replace the screws, using the new screws provided with the keyboard. Then press the Y key again, hard, to make sure that the keyboard is firmly connected.
1090 Keyboard CRU insulator
For access, remove these FRUs, in order: v 1010 Battery pack on page 60 v 1020 Backup battery on page 61 v 1030 Hard-disk drive on page 63 v 1070 Ultrabay 2000 device on page 73 v 1080 Keyboard on page 74 Note: The shape of the keyboard CRU insulator varies from model to model. In some models, the shape might be slightly different from the insulator in this figure.

1100 Hinge cover

For access, remove these FRUs, in order: v 1010 Battery pack on page 60 v 1020 Backup battery on page 61 v 1030 Hard-disk drive on page 63 v 1070 Ultrabay 2000 device on page 73 v 1080 Keyboard on page 74 v 1090 Keyboard CRU insulator on page 82 Note: Step 1 is common for all models.
Screw (quantity) M2.mm, nylon-coated (3)

For T20 and T21 series

Step 2
Screw (quantity) M2.5 4.8 mm, nylon-coated (1)
When installing: 1. Install the hinge cover according to the step 3 , 4 and then tighten the screw 2. In step 3 , take care not to damage the lens. 2. Make sure that both latches a are firmly attached and snap into place.

For T22 series

Screw (quantity) M2.mm, nylon-coated (1)
When installing: 1. Install the hinge cover according to the step 5 , 6 and then tighten the screw 4. In step 5 , take care not to damage the lens. 2. Make sure that both latches a are firmly attached and snap into place.

1110 Keyboard bezel

For access, remove these FRUs, in order: v 1010 Battery pack on page 60 v 1020 Backup battery on page 61 v 1030 Hard-disk drive on page 63 v 1070 Ultrabay 2000 device on page 73 v 1080 Keyboard on page 74 v 1090 Keyboard CRU insulator on page 82 v 1100 Hinge cover on page 83

When installing: 1. When attaching the CPU to the socket, do as shown in the step c. 2. Rotate the head of the screw (A) to the direction of the arrow b to lock the CPU.
Note: The shape of the CPU socket vary from model to model. When removing or installing the CPU, confirm the shape of the CPU socket and do either steps 1 , 2 and a or steps 1' , 2 and a'. Rotate the head of the screw to the direction of the arrow 1 or 1' to release the lock and then remove the CPU.
When installing: Rotate the head of the screw to the direction of the arrow a or a' to lock the CPU.
1140 PC Card slot assembly
Screw (quantity) M2 13.5 mm, nylon-coated (4)
When installing the PC card slot assembly, do as shown in the figure.

1150 Speaker

Before installing new speaker for T22 and T23 series: Secure speaker RF bracket ( a ) to the new speaker with an adhesive tape inside of the bracket. For T22 series

1160 Hard-disk bay

For access, remove these FRUs, in order: v 1010 Battery pack on page 60 v 1020 Backup battery on page 61 v 1030 Hard-disk drive on page 63 v 1070 Ultrabay 2000 device on page 73 v 1080 Keyboard on page 74 v 1090 Keyboard CRU insulator on page 82 v 1100 Hinge cover on page 83 v 1110 Keyboard bezel on page 88 v 1150 Speaker on page 103 Note: Step 3 and 4 are only for the case when Asset ID RF adapter has been attached into the hard-disk bay.
When installing: Make sure the followings: v a -parts of the insulation do not come off. v b -part ( b' s are only for T23 series) is not turned over. v Holes in the guide rail and in the aluminium sheet are aligned, and the aluminium sheet does not protrude in the c -parts. The protruding parts of the sheet can cause electrical short.

1170 Ultrabay 2000 slot

For T20 series
Note: T20 series do not have the removal procedure 3 and 4. After step 2 , go to step 5. When installing: Make sure that the FPC connector is firmly attached. (continued)

For T21 and T22 series

Note: T21 series do not have the removal procedure 3 and 4. After step 2 , go to step 5. When installing: Make sure that the FPC connector is firmly attached. (continued)
Note: The models with 13.3-in. XGA LCD in T20 series and in T21 series do not have FPC bracket ( 5 ). For those models, skip step 5.
When installing: Make sure that the FPC bracket is firmly attached as shown in the figure a. (continued)
Note: Step 6 to step 9 are common for T20, T21, T22 and T23 series.

Step 6

Step 7 8
Screw (quantity) M2 13.5 mm, nylon-coated (2) M2.5 4.8 mm, nylon-coated (2)
When installing: Make sure that the guide of the slot is firmly attached 1 and if the eject lever has been poped out, push it back in the direction of arrow 2 until it snaps, and then push the upper-right corner of the slot 3 to fix it firmly.

802.11/ v.90

14.1-in. XGA with antenna 14.1-in. XGA 14.1-in. XGA with antenna 14.1-in. SXGA+ 14.1-in. SXGA+ with antenna 48 GB 40 GB

Modem 802.11/ v.90

Parts list Model CPU Bay device Mini PCI adapter LCD HDD
T23 (Memory: 128 MB) 2647-5Mx, 9Mx 2647-5Nx, 9Nx, HNx, NNx *2 2647-5Fx, 9Fx, DFx *2 2647-5Dx, 9Dx 2647-5Hx, 9Hx 2647-5Jx, 9Jx
(**): Memory 256 MB CDRW Modem 802.11/ v.90 DVDROM (8x) DVD/ CDRW combo 14.1-in. SXGA+ 14.1-in. SXGA+ with antenna 14.1-in. SXGA+ 14.1-in. SXGA+ with antenna 14.1-in. SXGA+ 60 GB 48 GB

Tual 1.2

2647-5Ux, 9Ux
DVDROM (8x) DVD/ CDRW combo
2647-5Rx, 9Rx (**) 2647-5Sx, 9Sx, HSx *2 (**)
14.1-in. SXGA+ with antenna
v CMG xxx: Mobile Intel Pentium III processor xxx GHz (MHz) v Tual xxx: Mobile Intel Pentium III processor xxx GHz (MHz)-M v *1: no EDC feature, *2: featuring Secure chip

Overall

For T20, T21 and T22
a 21 b 18 l k h g 4 c d 3 e f
v Each FRU is available for all types or models, unless specific types or models are given. v The FRUs marked with asterisk are CRUs (customer replaceable units.) v The FRUs marked with OP are also available as optional FRUs.
No. a-l FRU See Miscellaneous parts on page 167. LCD unit (see LCD FRUs on page 157) Keyboard bezel for T20 for all models except xxK for models xxK Keyboard bezel for T21 and T22 for all models except xxK for models xxK 3 Fan assembly for T20 Fan assembly for T21 Fan assembly for T22 for 2647-3xx, 7xx, BxG for 2648-all for 2647-all except models 3xx, 7xx, BxG PC Card slots I/O card I/O card with conformal coating Microphone cable assembly Base cover for T20 for 2647-all except models xxK, xxT for 2647-xxK for 2647-xxT for 2648-all except models xxK, xxT for 2648-xxK for 2648-xxT Base cover for T21 for 2647-all except models xxK for 2647-xxK for 2648-all except models xxK for 2648-xxK 26P9291 04P3446 04P3445 04P3447 08K6079 08K6350 08K6346 08K6369 08K6372 08K6370 08K7268 26P9317 08K7064 26P8023 08K3373 27L0520 46P2613 46P2614 08K7066 04P3448 46P2615 46P2616 P/N
Parts list No. 7 FRU Base cover for T22 for 2647-3xx, 7xx, Bxx except models xxK for 2647-3xK, 7xK, BxK for 2647-4xx, 5xx, 8xx, 9xx, Mxx, Lxx except models xxK for 2647-4xK, 5xK, 8xK, 9xK, MxK, LxK for 2648-all except models xxK for 2648-xxK 8 Ultrabay 2000 diskette drive (TEAC) Ultrabay 2000 diskette drive (SONY) Ultrabay 2000 CD-ROM drive (TOSHIBA) OP Ultrabay 2000 CD-ROM drive (TEAC), low power OP Ultrabay 2000 CD-ROM drive (LG) OP Ultrabay 2000 CD-ROM drive (LG), low power OP Ultrabay 2000 DVD drive 6x (MKE) OP Ultrabay 2000 DVD drive 6x (TOSHIBA) OP Ultrabay 2000 DVD drive 8x (MKE) OP Ultrabay 2000 DVD drive 8x (HITACHI) OP 26P9291 26P9309 08K7362 26P9174 26P9173 26P9175 08K9606* 08K9607* 27L3973* 27L3436* 27L4141* 27L4301* 05K9188* 05K9160* 27L4241* 27L4236* P/N

26P9285

Parts list FRU System miscellaneous parts for T20 series: v (a) Hinge cover assembly v (23) Easy button cover v (i) I/O card spacer v (h) Cable RJ11 to system board docking v (j) Holder, backup battery v (g) Ultrabay 2000 guide rail v (l) Hard-disk bay guide rail v (b) Insulator, keyboard CRU v Mini PCI guide v Screw caps v Screw caps, rear Note: 12P4226 does not contain c, d, e, f and k. System miscellaneous parts for T21 series: v (a) Hinge cover assembly v (23) Easy button cover v (i) I/O card spacer v (h) Cable RJ11 to system board docking v (j) Holder, backup battery v (g) Ultrabay 2000 guide rail v (l) Hard-disk bay guide rail v (b) Insulator, keyboard CRU v (c) ESD fan cover v (d) ESD plate spring CSB v (e) ESD bracket, FPC v (f) Keyboard support v (24) Bracket, LCD FRC v Mini PCI guide v Grease v Screw caps v Screw caps, rear Note: 12P4227 does not contain k. System miscellaneous parts for T22 series: v (a) Hinge cover assembly v (23) Easy button cover v (i) I/O card spacer v (h) Cable RJ11 to system board docking v (j) Holder, backup battery v (g) Ultrabay 2000 guide rail v (l) Hard-disk bay guide rail v (b) Insulator, keyboard CRU v (c)ESD fan cover v (d) ESD plate spring CSB v (e) ESD bracket, FPC v (f) Keyboard support v (24) ESD bracket, LCD FPC v (k) Speaker RF bracket v Mini PCI guide v Grease v Screw caps v Screw caps, rear 12P4228 12P4227 P/N 12P4226
Parts list FRU System miscellaneous parts for T23 series: v (a) Hinge cover assembly v (23) Easy button cover T23 v (g) I/O card spacer v (f) Cable RJ11 to system board docking v (h) Holder, backup battery v (e) Ultrabay 2000 guide rail v (j) Hard-disk bay guide rail v (b) Insulator, keyboard CRU v (k) ESD bracket, FPC v (d) ESD bracket, LCD FPC v (c) EMI finger PCMCIA v (i) Bracket EMI speaker v Mini PCI guide v Thermal grease v Screw caps v Screw caps, rear I/O card miscellaneous parts for for T20, T21 and T22 series: v DC jack connector v Cable RJ11/45 to mini PCI v Insulator, modular jack v Insulation tape v Screw caps v Screw caps, rear I/O card miscellaneous part for T23 series: v DC jack connector v Cable RJ11/45 to Mini PCI/EDC v Insulator, modular jack v Insulator for system board v Insulation tape v Screw caps v Screw caps, rear System board miscellaneous parts for T20, T21 and T22 series: v System board stud v Insulator, PC card v Insulator, battery latch v Keyboard connector guide v Shock rubber v Insulator, docking connector v Insulator, fan connector v Insulator, Ultrabay 2000 connector v Insulator, I/O connector v Shield, Mini PCI v Insulator, hard-disk drive v Thermal grease v Screw caps v Screw caps, rear P/N 12P4229

Triconnector wrap plug PC test card Audio wrap cable USB parallel test cable Screwdriver kit Torque screwdriver 5 mm socket wrench Screwdriver ThinkPad hardware maintenance diskette version 1.62 Note: Download the file from the following Web site: http://www.ibm.com/pc/partner/infotips 72X8546 35G4703 66G5180 05K2580 95F3598 05K4695 05K4694 27L8126

Power cords (system)

IBM power cords for a specific country or region are usually available only in that country or region: For 2-pin power cords:
Region Canada, U.S. Japan Argentina P/N 13H5264* 13H5273* 36L8870*

For 3-pin power cords:

Region Australia, New Zealand Taiwan, Thailand Italy Denmark U.K., China (Hong Kong S.A.R.) European countries India, South Africa Israel Korea China (P.R.C.) (other than Hong Kong S.A.R.) Switzerland P/N 76H3514* 76H3516* 76H3530* 76H3520* 76H3524* 76H3518* 76H3522* 76H3532* 76H3535* 02K0539* 76H3528*
Power cords (docking station)
IBM power cords for a specific country or region are usually available only in that country or region: For 3-pin power cords:
Region Argentina Australia, New Zealand Canada, Thailand, U.S. Denmark European countries India, South Africa Israel Italy Japan Korea China (P.R.C.) (other than Hong Kong S.A.R) Switzerland U.K. P/N 36L8868* 75H8988* 75H8989* 75H8992* 75H8990* 75H8993* 75H8999* 75H8998* 75H8996* 76H3536* 02K0540* 75H8997* 75H8994*

Notices

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Resolving Traffic Problems with Cisco VPN 5000 Client on an IBM ThinkPad T22 with Intel Pro/100 SP Mobile Combo Adapter
Document ID: 12002 Cisco has announced the end of sales for the Cisco VPN 5000 Series Concentrators. For more information, please see the EndofSales Announcement.
Introduction Prerequisites Requirements Components Used Conventions Problem Solutions Modifying the Control Panel Settings Modifying the Registry Related Information

Introduction

In some instances, users running the VPN 5000 Clients for Windows 2000 can establish connectivity but cannot pass traffic. This problem was first seen and is most likely to occur with IBM ThinkPad models A22, T22, and X21 running Windows 2000 with the Intel Pro/100 SP Mobile Combo Adapter installed. Disabling the option for offloading stack functions can resolve the problem.

Prerequisites

Requirements
There are no specific requirements for this document.

Components Used

The information in this document is based on these software and hardware versions: IBM ThinkPad T22 Windows 2000 (releases SP1 and SP2) Intel Pro/100 SP Mobile Combo Adapter (E100BNT5.SYS version 5 drivers up to and including 5.41.27) Cisco VPN 5000 Client for Windows 2000 release 5.1.7 The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

Conventions

Refer to Cisco Technical Tips Conventions for more information on document conventions.

Problem

To improve performance, some adapters can offload functions that would normally be handled by the IP stack. The Intel Pro/100 SP network interface card (NIC) has an option for calculating the IP header checksum. If the stack thinks that the NIC will offload this function, it creates IP packets with a header checksum of $0000 and passes the packets to the physical adapter. When the VPN Client is not running, all packets can pass to the NIC with no problems. But when the VPN Client is running and the packet needs to be wrapped, the packet (which already has a zero checksum) has another IP header placed around it. The original packet is now payload data. The new IP packet has its header checksum computed and added by the VPN 5000 Client driver and is then sent to the NIC for transmission (where the NIC presumably recalculates the checksum that was just computed). When the packet arrives at the VPN Concentrator, it gets unwrapped and then discarded because the checksum is zero. By default, the IBM ThinkPad T22 is configured to enable the Intel Pro/100 SP NIC to offload functions from the stack, including the calculation of the IP header checksum. By disabling this feature, the VPN 5000 Client is able to pass traffic successfully.

Solutions

This issue can be resolved by disabling the offload option through the Windows Control Panel interface or by making a slight modification to the registry. By making one of these small adjustments, the IP stack will compute the checksum on all of its packets, and traffic should pass successfully.

Modifying the Control Panel Settings
To disable the offload function using Windows Control Panel, complete these steps. 1. Open the Properties window for the Network and Dialup Connection. 2. Click Configure. 3. Select the Advanced tab. 4. In the Property list, choose Offloading. 5. Use the pulldown Value list to select None. 6. Click OK to execute the change.

Modifying the Registry

To modify the registry, complete these steps. 1. Open Registry Editor by going to Start > Run and typing regedit. 2. Open HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Control/Class. 3. Search through the adapters until you find one with the name (Default), type REG_SZ, and value Network adapters. 4. Search the adapter subfolders and select the one named Intel SP NIC. 5. Select the Edit menu and choose Modify. 6. Modify the file to show TaskOffload to 0 to disable checksum offloading.

Related Information

Cisco VPN 5000 Series Concentrators EndofSales Announcement Cisco VPN 5000 Series Concentrators Support Page Cisco VPN 5000 Client Support Page IPSec Negotiation/IKE Protocols Support Page Technical Support & Documentation Cisco Systems
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Updated: Jan 14, 2008

Document ID: 12002