Lenovo TAB S8-50 Посібник з обслуговування обладнання - Сторінка 21

General checkout

This chapter presents the following information:

• "What to do first" on page 18

• "Power system checkout" on page 19

Before you go to the checkout, make sure to read the following important notes:

Important notes:

• Only certified trained personnel can service the computer.

• Before replacing any FRU, read the entire page on removing and

replacing FRUs.

• When you replace FRUs, use new nylon-coated screws.

• Be extremely careful during such write operations as copying,

saving, or formatting. Drives in the computer that you are servicing

sequence might have been altered. If you select an incorrect drive, data

or programs might be overwritten.

• Replace an FRU only with another FRU of the correct model. When

you replace an FRU, make sure that the machine model and the FRU part

number are correct by referring to the FRU parts list.

• An FRU should not be replaced just because of a single,

unreproducible failure. Single failures can occur for a variety of reasons

that have nothing to do with a hardware defect, such as cosmic radiation,

electrostatic discharge, or software errors. Consider replacing an FRU

only when a problem recurs. If you suspect that an FRU is defective,

clear the error logs and run the test again. If the error does not recur, do

not replace the FRU.

• Be careful not to replace a nondefective FRU.

General checkout