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About this manual This manual contains service and reference information for ThinkPad® R50/R50p and R51 series (MT1829, 1830, 1831, 1832, 1833, 1836, 1840, 1841, 2883, 2887, 2888, 2889, 2894, 2895), 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 ... .34 Testing the computer ... .34 Detecting system information with PC-Doctor . . .37 Power system checkout ... .37 ThinkPad R50/R50p and R51 Series ... .41 Product overview ... .43 Specifications ... .43 Status indicators ... .48 FRU tests ... .50 Fn key combinations ... .52 Symptom-to-FRU index ... .54 Numeric error codes ... .54 Error messages ... .58 Beep symptoms ... .59 No-beep symptoms ... .59 LCD-related symptoms ... .60 Intermittent problems ... .61 Undetermined problems ... .61 FRU replacement notices ... .62 Screw notices ... .62 Retaining serial numbers ... .63 Removing and replacing a FRU ... .66 1010 Battery pack ... .67 1020 Ultrabay Enhanced device ... .68 1030 Hard disk drive ... .69 1040 DIMM (optional) ... .71 1050 Keyboard ... .72 1060 DIMM (standard) ... .76 1070 Modem daughter card (MDC/MDC-2) . . .77 1080 Bluetooth/Modem daughter card (BMDC/BMDC-2) ... .79 1090 Keyboard bezel ... .81 1100 Mini PCI adapter ... .85 1110 Fan assembly ... .89 1120 CPU ... .90 1130 Backup battery ... .91 1140 Speaker assembly ... .92 1150 IEEE 1394 cable ... .94 1160 PC Card slots assembly ... .97 1170 Ultrabay Enhanced shield kit ... .98 1180 LCD assembly ... .105 1190 VGA and Ultrabay Enhanced device eject button cable ... .109 1200 System board, interposer card, and base cover ... .112 2010 LCD front bezel ... .119 2020 Inverter card ... .121 2030 LCD panel, LCD cable assembly, wireless LAN antenna assembly, hinges, and LCD cover .122 3010 ThinkPad Dock II PCI cover ... .132 3020 ThinkPad Dock II top cover ... .133 Locations ... .136 Front view ... .136 Rear view ... .138 Bottom view ... .139 Parts list ... .140 Overall ... .140 LCD FRUs ... .188 AC adapters ... .206 Keyboard ... .207 Recovery CDs ... .209 Miscellaneous parts ... .217 Optional FRUs ... .221 Common parts list ... .222 Notices ... .224 Trademarks ... .226