IBM Thinkpad A22m Wireless Models Manual

Symptom-to-FRU index
The symptom-to-FRU index in this section lists symptoms
and errors and their possible causes. The most likely
cause is listed first, in boldface type.
Note:Do the FRU replacement or other actions in the
sequence shown in the column headed“FRU or
action, in sequence.”If replacing a FRU does not
solve the problem, put the original part back in the
computer. Do not replace a nondefective FRU.
This index can also help you determine, during regular
servicing, what FRUs are likely to need...

Symptom or error FRU or action, in sequence
0190
Critical low battery error.1.Charge the battery pack.
2. Battery pack.
0193
RF antenna has been removed.Enter the supervisor
password.
0194
The computer has been carried
through a security gate.Enter the supervisor
password.
0200
Hard disk error—The hard
disk is not working.1.Reseat the hard-disk
drive.
2. Load Setup Defaults in IBM
BIOS Setup Utility.
3. Hard-disk drive.
4. System board.
021x
Stuck key—Keyboard error.Run interactive tests of the
keyboard...

Symptom or error FRU or action, in sequence
0270
Real-time clock error.1.Replace the backup
battery and run IBM BIOS
Setup Utility to reset the
time and date.
2. System board.
0271
Date and time error—Neither
the date nor the time is set in
the computer.Run IBM BIOS Setup Utility to
reset the time and date.
02B2
Incorrect drive A type.1.Diskette drive.
2. External FDD cable.
3. I/O card.
02F4
EISA CMOS not writable.1.Load Setup Defaults in
IBM BIOS Setup Utility.
2. Replace the backup battery.
3. System...

Error messages
Symptom or error FRU or action, in sequence
Device address conflict. 1.Load Setup Defaults in
IBM BIOS Setup Utility.
2. Backup battery.
3. System board.
Allocation error for device. 1.Load Setup Defaults in
IBM BIOS Setup Utility.
2. Backup battery.
3. System board.
Failing bits: nnnn. 1.DIMM.
2. System board.
Invalid system configuration
data.1.DIMM.
2. System board.
I/O device IRQ conflict. 1.Load Setup Defaults in
IBM BIOS Setup Utility.
2. Backup battery.
3. System board.
Operating...

Beep symptoms
Symptom or error FRU or action, in sequence
One beep and a blank,
unreadable, or flashing LCD.1.Reseat the LCD
connector.
2. LCD assembly.
3. External CRT.
4. System board.
One long and two short beeps,
and a blank or unreadable
LCD.1.System board.
2. LCD assembly.
3. DIMM.
Two short beeps with error
codes.POST error. See“Numeric
error codes”on page 47.
Two short beeps with blank
screen.1.System board.
2. DIMM.
Two or more beeps, or a
continuous beep. Operating
System starts successfully.If...

LCD-related symptoms
ImportantThe TFT LCD for the notebook computer contains
many thin-film transistors (TFTs). A small number of
dots that are missing, discolored, or always lighted
is characteristic of TFT LCD technology, but
excessive pixel problems can cause viewing
concerns. The LCD should be replaced if the
number of missing, discolored, or lighted dots in any
background is:
vXGA:8 or more bright dots, 8 or more dark dots,
or a total of 9 or more bright and dark dots.
Note:Bright dots means pixel...

Undetermined problems
You are here because the diagnostic tests did not identify
which adapter or device failed, wrong devices are installed,
a short circuit is suspected, or the system is inoperative.
Follow these procedures to isolate the failing FRU (do not
isolate FRUs that have no defects).
Verify that all attached devices are supported by the
computer.
Verify that the power supply being used at the time of the
failure is operating correctly. (See“Power system
checkout”on page 35.)
1. Power off the...

FRU replacement notices
This section contains notices related to removing and
replacing parts. Read this section carefully before replacing
any FRU.
Screw notices
Loose screws can cause a reliability problem. In IBM
ThinkPad computer, this problem is addressed with special
nylon-coated screws that have the following characteristics:
vThey maintain tight connections.
vThey do not easily come loose, even with shock or
vibration.
vThey are harder to tighten.
vThey should be used only once.
Do the following...

vMake sure you use the correct screw. If you have a
torque screwdriver, tighten all screws firmly to the torque
shown in the table.Never use a screw that you
removed. Use a new one. Make sure the screws are
tightened firmly.
Retaining serial numbers
This section includes the following descriptions:
v“Restoring the serial number of the system unit”
v“Retaining the UUID”
Restoring the serial number of the system
unit
When the computer was manufactured, the EEPROM on
the system board was loaded with the...

unique IDs until the year A.D. 3400. No two computers in
the world have the same number.
When you replace the system board, you must set the
UUID on the new system board as follows:
1. Install the ThinkPad hardware maintenance diskette
version 1.61, and restart the computer.
2. From the main menu, select4. Assign UUID.
A new UUID is created and written. If a valid UUID
already exists, it is not overwritten.
FRU replacement notices
56ThinkPad A22m wireless models