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About this manual This manual contains service and reference information for ThinkPad® T40/T40p, T41/T41p, T42/T42p series (MT2373, 2374, 2375, 2376, 2378, 2379, 2668, 2669, 2678, 2679, 2686, and 2687), and ThinkPad Dock II (MT2877) products. Use this manual along with the advanced diagnostic tests to troubleshoot problems. The manual is divided into sections as follows: v The common sections provide general information, guidelines, and safety information required in servicing computers. v The product-specific section includes service, reference, and product-specific parts information. Important This manual is intended for trained service personnel who are familiar with ThinkPad products. Use this manual along with the advanced diagnostic tests to troubleshoot problems effectively. Before servicing a ThinkPad product, be sure to review the safety information under “Safety notices: multilingual translations” on page 4, “Safety information” on page 16, and “Laser compliance statement” on page 22. Contents About this manual ... .1 Introduction ... .3 Important service information ... .3 Strategy for replacing FRUs ... .3 How to use error messages ... .4 Diskette compatibility matrix ... .4 Safety notices: multilingual translations ... .4 Safety information ... .16 General safety ... .16 Electrical safety ... .17 Safety inspection guide ... .19 Handling devices that are sensitive to electrostatic discharge ... .20 Grounding requirements ... .21 Laser compliance statement ... .22 General descriptions ... .25 Read this first ... .25 What to do first ... .25 Related service information ... .27 Service Web site ... .27 Restoring the pre-installed system ... .27 Passwords ... .28 Power management ... .32 Checkout guide ... .35 Testing the computer ... .35 Detecting system information with PC-Doctor . . .38 Power system checkout ... .39 ThinkPad T40/T40p, T41/T41p, T42/T42p Series 43 Product overview ... .45 Specifications ... .45 Status indicators ... .50 FRU tests ... .53 Fn key combinations ... .54 Symptom-to-FRU index ... .58 Numeric error codes ... .58 Error messages ... .62 Beep symptoms ... .63 No-beep symptoms ... .63 LCD-related symptoms ... .64 Intermittent problems ... .65 Undetermined problems ... .65 FRU replacement notices ... .66 Screw notices ... .66 Retaining serial numbers ... .67 Removing and replacing a FRU ... .70 1010 Battery pack for 14.1-in. LCD models . . .71 1020 Battery pack for 15.0-in. LCD models . . .73 1030 Ultrabay Slim device ... .74 1040 Hard disk drive ... .75 1050 DIMM (optional) ... .77 1060 Keyboard ... .79 1070 DIMM (standard) ... .83 1080 Modem daughter card (MDC/MDC-2) . . .84 1090 Bluetooth/Modem daughter card (BMDC/BMDC-2) ... .86 1100 Palm rest or Palm rest with fingerprint sensor (for 14.1-in. LCD models) ... .88 1110 Keyboard bezel or Keyboard bezel with fingerprint sensor (for 15.0-in. LCD models) . .91 1120 Mini PCI adapter ... .97 1130 Fan assembly ... .101 1140 Backup battery for 14.1-in. LCD models 106 1150 Backup battery for 15.0-in. LCD models 108 1160 Speaker assembly ... .110 1170 Keyboard bezel for 14.1-in. LCD models 112 1180 PC Card slot assembly for 14.1-in. LCD models ... .114 1190 PC Card slot assembly for 15.0-in. LCD models ... .116 1200 LCD assembly for 14.1-in. LCD models 118 1210 LCD assembly for 15.0-in. LCD models 123 1220 CPU ... .128 1230 Ultrabay Slim guide rail assembly for 14.1-in. LCD models ... .129 1240 Ultrabay Slim guide rail assembly for 15.0-in. LCD models ... .131 1250 VGA and Ultrabay Slim device eject button cable ... .134 1260 System board and base cover for 14.1-in. LCD models ... .136 1270 System board, interposer card, and base cover for 15.0-in. LCD models ... .145 2010 LCD front bezel for 14.1-in. LCD models 153 2020 LCD front bezel for 15.0-in. LCD models 155 2030 Inverter card for 14.1-in. LCD models . . .157 2040 Inverter card for 15.0-in. LCD models . . .159 2050 Wireless antenna assemblies, LCD panel, LCD cable assembly, hinges, and LCD cover for 14.1-in. LCD models ... .160 2060 Wireless antenna assemblies, LCD panel, LCD cable assembly, hinges, and LCD cover for 15.0-in. LCD models ... .175 3010 ThinkPad Dock II PCI cover ... .182 3020 ThinkPad Dock II top cover ... .183 Locations ... .186 Front view ... .186 Rear view ... .188 Bottom view ... .189 Parts list ... .190 Overall ... .191 14.1-in. LCD FRUs ... .220 15.0-in. LCD FRUs ... .230 Keyboard ... .235 Recovery CDs ... .237 Miscellaneous parts ... .243 AC adapters ... .246 Optional FRUs ... .247 Common parts list ... .248 Notices ... .250 Trademarks ... .252