Lenovo 28762JU, Hardware Maintenance Manual, Page: 41 / 146

General checkout
This chapter presents following information:
v
“What to do first” on page 34
v “Checkout guide” on page 35
– “Diagnostics using PC-Doctor for DOS” on page 35
– “Testing the computer” on page 36
– “Detecting system information with PC-Doctor” on page 37
– “Lenovo ThinkVantage Toolbox (Lenovo System Toolbox)” on page 38
– “PC-Doctor for Rescue and Recovery” on page 38
– “FRU tests” on page 39
v
“Power system checkout” on page 41
– “Checking the ac adapter” on page 41
– “Checking operational charging” on page 42
– “Checking the battery pack” on page 42
– “Checking the backup battery” on page 43
The descriptions in this chapter apply to any ThinkPad model that supports the
PC-Doctor
®
for DOS diagnostics program. Some descriptions might not apply to
your 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 replacing
FRUs.
v When you replace FRUs, use new nylon-coated screws.
v
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.
v Replace a FRU only with another FRU of the correct model. When you
replace a FRU, make sure that the model of the machine and the FRU part
number 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 with
a hardware defect, such as cosmic radiation, electrostatic discharge, or
software errors. Consider replacing a FRU only when a problem recurs. If you
suspect that a FRU is defective, clear the error log and run the test again. If
the error does not recur, do not replace the FRU.
v
Be careful not to replace a nondefective FRU.
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