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About this manual This manual contains service and reference information for ThinkPad® X41 (MT 1864/1865/2525/2526/2527/2528) product. 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 8, “Safety information” on page 20, and “Laser compliance statement” on page 26. Contents About this manual ... .1 Introduction ... .3 Important service information ... .3 Strategy for replacing FRUs ... .3 Strategy for replacing a Hard disk drive ... .4 How to use error messages ... .4 Strategy for replacing FRUs for CTO, CMV, and GAV 4 Product definition ... .4 FRU identification for CTO, CMV, and GAV products 5 Important information about replacing RoHS compliant FRUs ... .7 Diskette compatibility matrix ... .8 Safety notices: multilingual translations ... .8 Safety information ... .20 General safety ... .20 Electrical safety ... .21 Safety inspection guide ... .23 Handling devices that are sensitive to electrostatic discharge ... .24 Grounding requirements ... .25 Laser compliance statement ... .26 General descriptions ... .29 Read this first ... .29 What to do first ... .29 Related service information ... .31 Service Web site ... .31 Restoring the preloaded system ... .31 Recovering the Hard disk to original contents . . .34 Passwords ... .37 Power management ... .39 Checkout guide ... .42 Testing the computer ... .42 Detecting system information with PC-Doctor . . .45 Power system checkout ... .45 ThinkPad X41 ... .49 Product overview ... .51 Specifications ... .51 Status indicators for X41 ... .53 FRU tests ... .55 Fn key combinations ... .57 Symptom-to-FRU index ... .59 Numeric error codes ... .59 Error messages ... .67 Beep symptoms ... .69 No-beep symptoms ... .69 LCD-related symptoms ... .70 Undetermined problems ... .71 FRU replacement notices ... .72 Screw notices ... .72 Retaining serial numbers ... .73 Removing and replacing a FRU ... .76 1010 Battery pack ... .77 1020 Hard disk drive ... .78 1030 DIMM cover ... .79 1040 Mini PCI adapter, DIMM, MDC-2, and BMDC-3 ... .80 1050 Keyboard ... .83 1060 Upper case ... .86 1070 Fingerprint board ... .89 1080 Backup battery ... .91 1090 LCD module ... .92 1100 Hard disk housing assembly ... .95 1110 Top shielding ... .96 1120 Lower case ... .97 1130 Fansink ... .101 2010 LCD bezel ... .102 2020 LCD ... .105 2030 Inverter card ... .106 2040 Antenna L and antenna R ... .108 2050 Hinge L and hinge R ... .112 2060 Bluetooth antenna cable ... .114 Locations ... .115 Front view for X41 series ... .115 Rear view for X41 series ... .116 Bottom view for X41 series ... .117 Front View for X4 UltraBase Dock ... .118 Rear View for X4 UltraBase Dock ... .119 Parts list ... .120 Overall ... .120 LCD FRUs ... .130 Keyboard ... .131 Recovery CDs ... .133 Miscellaneous parts ... .134 Optional FRUs ... .135 AC adapters ... .136 Common parts list ... .137 Notices ... .140 Trademarks ... .142