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Check Procedures 33
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This is the entry point for all check procedures. The
check procedures use failure symptoms, Power-On
Self Test (POST) error codes, or beeps to help
determine the defective field replaceable unit (FRU).
Follow the suggested check procedures or use the
diagnostics diskette to determine the problem FRU.
IMPORTANT:
Replace FRUs ONLY when it is
determined that the error is not a result of
software, loose contacts, or dirty component
surfaces. Any FRU change should be verified
by running a complete test (“Diagnostics - All
Tests” in PC-Doctor diagnostics program).
This book comes with a diagnostic program diskette.
This diskette should be used ONLY with
2274
Service Level A (SL-A)
IBM Personal Computers.
Do not use this diskette on other models.
POST error codes and error messages are displayed
on the screen after the IBM logo. Meanwhile, error
beeps could be issued to help diagnose syste
problem. Please refer to “Index of Symptoms,
Messages, Error Codes, or Beeps” on page 38 for
additional help.
All voltages in the check procedures are positive
unless otherwise indicated. Use frame ground for all
voltage checks unless otherwise specified.
IMPORTANT:
There is a Power Override switch
located at the back of the machine, just above
the connector for the power cable. If the
system does not power on after pressing the
power button situated on the front of the
machine, please check the power cable and
the Power Override switch. If the Power
Override switch is switched on, no power is
supplied to the system.
NOTE:
If the check procedures instruct you to replace
a FRU and the error message persists, an
option adapter card might be causing the
failure. Remove all option adapter cards, one
at a time, until the error changes or the
problem is no longer apparent. Replace the
last option adapter card removed.