Lenovo B40-70 Hardware Maintenance Manual - Lenovo B40-xx Notebook - Page 23

General checkout

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Lenovo B40-30/B40-45/B40-70 General checkout This chapter presents the following information: • "What to do first" on page 20 • "Power system checkout" on page 21 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. 19

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Lenovo B40-30/B40-45/B40-70
19
This
 
chapter
 
presents
 
the
 
following
 
information:
•
“What
 
to
 
do
 
first”
 
on
 
page
 
20
•
“Power
 
system
 
checkout”
 
on
 
page
 
21
Before
 
you
 
go
 
to
 
the
 
checkout,
 
make
 
sure
 
to
 
read
 
the
 
following
 
important
 
notes:
General checkout
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.