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General checkout
General checkout
This chapter presents the following information:
• “What to do fi rst” on page 22
• “Power system checkout” on page 23
Before you go to the checkout, make sure to read the following important notes:
Important notes:
• Only certifi ed 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 a FRU only with another FRU of the correct model. When you
replace a FRU, make sure that the machine model and the FRU part number are
correct by referring to the FRU parts list.
• A 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 a FRU only when a problem recurs. If you suspect that
a 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.