IBM R50 Series Hardware Maintenance Manual

Also see for ThinkPad Dock II: Manual User guide Manual User guide Manual 

Contents

General descriptionsThe desciptions in this chapter apply to any ThinkPadmodel that has the PC-Doctor ® DOS diagnostics program.Some descriptions might not apply to your particularcomputer.Read this firstBefore you go to the checkout guide, be sure to read thissection.Important notesv Only certified trained personnel shouldservice the computer.v Before replacing any FRU, read the entirepage on removing and replacing FRUs.v When you replace FRUs, use newnylon-coated screws.v Be extremely careful during such writeoperations as copying, saving, or formatting.Drives in the computer that you are servicingsequence might have been altered. If you selectan incorrect drive, data or programs might beoverwritten.v Replace an FRU only with another FRU of thecorrect model. When you replace a FRU, makesure that the model of the machine and the FRUpart number are correct by referring to the FRUparts list.v A FRU should not be replaced because of asingle, unreproducible failure. Single failurescan occur for a variety of reasons that havenothing to do with a hardware defect, such ascosmic radiation, electrostatic discharge, orsoftware errors. Consider replacing a FRU onlywhen a problem recurs. If you suspect that aFRU is defective, clear the error log and run thetest again. If the error does not recur, do notreplace the FRU.v Be careful not to replace a nondefective FRU.What to do firstWhen you do return a FRU, you must include the followinginformation in the parts exchange form or parts return formthat you attach to it:__ 1. Name and phone number of servicer© Copyright IBM Corp. 2004 25