General checkoutThis chapter presents following information:v “What to do first” on page 46v “Checkout guide” on page 47– “Diagnostics using PC-Doctor for DOS” on page 47– “Lenovo ThinkVantage Toolbox (Lenovo System Toolbox)” on page 50– “PC-Doctor for Rescue and Recovery” on page 50– “FRU tests” on page 51v “Power system checkout” on page 53The descriptions in this chapter apply to any ThinkPad model that supports thePC-Doctor ® for DOS diagnostics program. Some descriptions might not apply toyour particular computer.Before you go to the checkout guide, be sure to read the following important notes.Important notes:v Only certified trained personnel should service the computer.v Before replacing any FRU, read the entire page on removing and replacingFRUs.v When you replace FRUs, use new nylon-coated screws.v Be extremely careful during such write operations as copying, saving, orformatting. Drives in the computer that you are servicing sequence mighthave been altered. If you select an incorrect drive, data or programs might beoverwritten.v Replace a FRU only with another FRU of the correct model. When youreplace a FRU, make sure that the model of the machine and the FRU partnumber are correct by referring to the FRU parts list.v A FRU should not be replaced because of a single, unreproducible failure.Single failures can occur for a variety of reasons that have nothing to do witha hardware defect, such as cosmic radiation, electrostatic discharge, orsoftware errors. Consider replacing a FRU only when a problem recurs. If yoususpect that a FRU is defective, clear the error log and run the test again. Ifthe error does not recur, do not replace the FRU.v Be careful not to replace a nondefective FRU.© Copyright Lenovo 2010 45
