Index Of Symptoms, Messages, Error Codes, Or Beeps - IBM PC 300 Maintenance Service Manual

Index of Symptoms, Messages, Error Codes, or Beeps

How to Use Error Messages: Use the messages, error codes, and beeps combinations that occur to diagnose failures. If
more than one failure occurs, diagnose from the first failure that appears. The cause of the first failure can result in false
messages, error codes, or beeps. If you did not receive any messages, error codes, or beeps, see if the symptom is listed in
Table 2-3, " Error Symptoms List" on page 62.
ATTENTION: When you have replaced a FRU, you must run the diagnostics to ensure that no other activity has been
affected by the change. This system check can be done through the diagnostics program (Select Diagnostics, then
select and execute All Tests from PC-Doctor).
POST: Some diagnostic aids are resident in the machine, such as the Power-On Self Test (POST). The machine performs
the POST each time it is powered on. Use this information throughout the diagnostic procedures. The POST is a series of
system checks and initializations that verify the correct operation of the base system.
After a successful POST, the system attempts to load operating system. The system can be customized for different startup
(boot) methods by the BIOS Setup Utility. See "Advanced Setup" on page 47.
The system's default startup sequence automatically looks for the operating system files in the hard disk if these files are not
found in the diskette.
NOTE: Remember that POST does not test all areas, but only those that allow the system to operate well enough to run the
diagnostics program.
Table 2-1 lists BIOS error codes, messages, and beeps to their possible causes, table 2-3 lists error symptoms and their
possible causes. The most likely cause is listed first. Make sure you complete all items in the cause or "Action/FRU" column.
When servicing a system, always begin with "Start" on page 55.
If the problem cannot be corrected using these two index tables, go to "Undetermined Problems" on page 80.
NOTES:
If an error message and incorrect audio response occur, diagnose the error message first.
If you cannot run the diagnostics program tests but did receive a POST error code, diagnose the POST error message.
If you did not receive any error message, look for a description of your error symptoms in "Error Symptoms List" in page 62.
Check all power supply voltages, switch, and jumper settings before you replace the system board. Also check the power
supply voltages if you have a "system no-power" condition. (Please refer to
problem cannot be corrected by using the "BIOS Error Codes, Messages, And Beeps List" table and "Error Symptoms List"
table, go to "Undetermined Problems" on page 80.
Table 2-1 BIOS Error Codes, Messages, and Beeps List
BIOS Error Codes,
Messages, beeps
NOTE: To diagnose a problem, first find the BIOS error messages, codes, or
beeps in left column. If directed to a check procedure, replace the FRU indicated
in the check procedure. If no check procedure is indicated, the first Action/FRU
listed in right column is the most likely cause.
POST Error Codes and Messages
161
CMOS battery failed
162
CMOS checksum error
164
Memory size error
Action/FRU
Load default settings in Setup and reboot the system.
CMOS battery.
System board.
Make sure the equipment (diskette drive, hard disk
drive, keyboard, mouse, etc.) is connected properly
and are set correctly in BIOS Setup.
Load default settings in setup.
CMOS battery should be replaced.
System board.
Make sure the DIMMs are inserted properly.
System board.
on page 111.) If the
Parts/Test Point Locations
57