IBM R31 - Manual (Page 7)

ThinkPad R30/R31 Hardware
Maintenance Manual
Introduction
Important Service Information
Important
Diskette fixes are customer-installable. The diskette
fixes are posted on the IBM support site
http://www.pc.ibm.com/support/ .
Advise customers to contact the IBM ® HelpCenter ®
at 800-772-2227 if they need assistance in obtaining
or installing any diskette fixes.
Customers in Canada should call IBM ® HelpCenter ®
at 800-565-3344 for assistance or download
information.
FRU Replacement Strategy
Before Replacing Parts
Ensure that all diskette fixes are installed prior to
replacing any FRUs listed in this manual.
Use the following strategy to prevent unnecessary FRU
replacement and service expense:
v If you are instructed to replace a FRU and that does
not correct the problem, reinstall the original FRU
before you continue.
v Some computers have both a processor board and a
system board. If you are instructed to replace either the
processor board or the system board, and the first board
that you replaced does not correct the problem, reinstall
the original board, then replace the other (processor or
system) board.
v If an adapter or device consists of more than one FRU,
an error code may be caused by any of the FRUs.
Before replacing the adapter or device, remove the
FRUs, one by one, to see if the symptoms change.
Replace only the FRU that changed the symptoms.
v R31 : When CPU is replaced, the heat sink should be
replaced with new one also.
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