IBM Thinkpad A21e A22e I 1800 Manual

							Symptom or error FRU or action, in sequence
0190
Critical low battery error.1.Charge the battery pack.
2. Battery pack.
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 and the auxiliary
input device.
0220
Monitor type error—Monitor
type does not match the one
specified in CMOS.Load Setup Defaults in IBM
BIOS Setup Utility.
0230
Shadow RAM error—The
shadow RAM failure at offset
nnnn.System board.
0231
System RAM failure at offset
nnnn.1.DIMM.
2. System board.
0232
Extended RAM error—
Extended RAM failure at offset
nnnn.1.DIMM.
2. System board.
0250
System battery error—System
battery is dead.Replace the backup battery
and run IBM BIOS Setup
Utility to reset the time and
date.
0251
System CMOS checksum
bad—Default configuration
used.Replace the backup battery
and run IBM BIOS Setup
Utility to reset the time and
date.
0252
Password checksum bad—
The password is cleared.Reset the password by
running IBM BIOS Setup
Utility.
0260
System timer error.1.Replace the backup
battery and run IBM BIOS
Setup Utility to reset the
time and date.
2. System board.
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.
(continued)
Symptom-to-FRU index
ThinkPad A21e, A22e, i 180047 
						

							Symptom or error FRU or action, in sequence
0280
Previous boot incomplete—
Default configuration used.1.Load Setup Defaults in
IBM BIOS Setup Utility.
2. DIMM.
3. System board.
02D0
System cache error.
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 board.
02F5
DIMM test failure.1.DIMM.
2. System board.
02F6
Software NMI failure.1.DIMM.
2. System board.
02F7
Fail-safe timer NMI failure.1.DIMM.
2. System board.
1801
Attached docking station is not
supported.Shut down the computer and
remove it from the docking
station.Symptom-to-FRU index
48ThinkPad A21e, A22e, i 1800 (MT 2655/2663/2664) 
						

							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 system not found. 1. Check that the operating
system has no failure and is
installed correctly.
2.Enter IBM BIOS Setup
Utility and see whether
the hard-disk drive and
the diskette drive are
properly identified.
3. Reseat the hard-disk drive.
4. Reinstall the operating
system.
5. Diskette drive.
6. Hard-disk drive.
7. System board.
Hibernation error. 1.Restore the system
configuration to what it
was before the computer
entered hibernation mode.
2. If memory size has been
changed, re-create the
hibernation file.
Fan error.Fan.
Unsupported memory
configuration.Shut down the computer and
remove the extra memory.
Maximum memory size is:
v256 MB for A21e series and
the low-end models of A22e.
v512 MB for the high-end
models of A22e.Symptom-to-FRU index
ThinkPad A21e, A22e, i 180049 
						

							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 46.
Two short beeps with blank
screen.1.System board.
2. DIMM.
Two or more beeps, or a
continuous beep. Operating
System starts successfully.If a mini-PCI Ethernet card is
installed, confirm thatAlert On
LAN 2in IBM BIOS Setup
Utility isdisabled.
Three short beeps, pause,
three more short beeps, and
one short beep.1.DIMM.
2. System board
Only cursor appears.Reinstall operating system.
No beep symptoms
Symptom or error FRU or action, in sequence
No beep, power-on indicator
on, LCD blank, and no POST.1.Make sure that every
connector is connected
tightly and correctly.
2. DIMM.
3. System board.
No beep, power-on indicator
on, and LCD blank during
POST.1.Reseat DIMM.
2. System board.
No beep during POST, but
system runs correctly.Speaker.
The power-on password
prompt.A power-on password or a
supervisor password is set.
Type the password and press
Enter.
The hard-disk password
prompt.A hard-disk password is set.
Type the password and press
Enter.
The DOS full screen looks
smaller.Start the ThinkPad
Configuration program and set
theScreen expansion
function.Symptom-to-FRU index
50ThinkPad A21e, A22e, i 1800 (MT 2655/2663/2664) 
						

							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:
vSVGA:5 or more bright dots, 5 or more dark
dots, or a total of 9 or more bright and dark dots.
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 is always on (white
or color.) Dark dots means pixel is always off
(black color.)
Symptom or error FRU or action, in sequence
No beep, power-on indicator
on, and a blank LCD during
POST.System board.
vLCD backlight not working.
vLCD too dark.
vLCD brightness cannot be
adjusted.
vLCD contrast cannot be
adjusted.1.Reseat the LCD
connectors.
2. LCD assembly.
3. System board.
vLCD screen unreadable.
vCharacters missing pixels.
vScreen abnormal.
vWrong color displayed.1.See important note for
“LCD-related symptoms”.
2. Reseat all LCD connectors.
3. LCD assembly.
4. System board.
Horizontal or vertical lines
displayed on LCD.LCD assembly. Symptom-to-FRU index
ThinkPad A21e, A22e, i 180051 
						

							Intermittent problems
Intermittent system hang problems can be due to a variety
of causes that have nothing to do with a hardware defect,
such as cosmic radiation, electrostatic discharge, or
software errors. FRU replacement should be considered
only when a problem recurs.
When analyzing an intermittent problem, do the following:
1. Run the diagnostic test for the system board in loop
modeat least 10 times.
2. If no error is detected, donotreplace any FRUs.
3. If any error is detected, replace the FRU shown by the
FRU code. Rerun the test to verify that no more errors
exist.
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 34.)
1. Power off the computer.
2. Visually check each FRU for damage. Replace any
damaged FRU.
3. Remove or disconnect all of the following devices:
a. Non-IBM devices
b. Devices attached to the port replicator
c. Printer, mouse, and other external devices
d. Battery pack
e. Hard-disk drive
f. External diskette drive
g. DIMM
h. CD-ROM and diskette drive in the Ultrabay 2000
i. PC Cards
4. Power on the computer.
5. Determine whether the problem has changed.
6. If the problem does not recur, reconnect the removed
devices one at a time until you find the failing FRU.
7. If the problem remains, replace the following FRUs one
at a time (do not replace a nondefective FRU):
a. System board
b. LCD assembly
Symptom-to-FRU index
52ThinkPad A21e, A22e, i 1800 (MT 2655/2663/2664) 
						

							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 when you service this machine:
vKeep the screw kit (for the P/N, see“Miscellaneous
parts”on page 131) in your tool bag.
vAlways use new screws.
vUse a torque screwdriver if you have one.
Tighten screws as follows:
vPlastic to plastic
Turn an additional90 degreesafter the screw head
touches the surface of the plastic part:
90 degrees more
(Cross-section)
vLogic card to plastic
Turn an additional180 degreesafter the screw head
touches the surface of the logic card:
180 degrees more
(Cross-section)
vTorque driver
If you have a torque driver, refer to the“Torque”column
for each step.
FRU replacement notices
ThinkPad A21e, A22e, i 180053 
						

							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 serial numbers of
the system and all major components. These numbers
need to remain the same throughout the life of the
computer.
If you replace the system board, you must restore the
serial number of the system unit to its original value.
Before replacing the system board, save the original serial
number by doing the following:
1. Install the ThinkPad hardware maintenance diskette
version 1.61, and restart the computer.
2. From the main menu, select1. Set System
Identification.
3. Select2. Read S/N data from EEPROM.
The serial number for each device is displayed. Write
down the serial number of the system unit, designated as
follows:
20: System unit serial number
After you have replaced the system board, restore the
serial number by doing the following:
1. Install the ThinkPad hardware maintenance diskette
version 1.61 and restart the computer.
2. From the main menu, select1. Set System
Identification.
3. Select1. Add S/N data from EEPROM.
Follow the instructions on the screen.
Note:The serial number of the system unit is written on
the label attached on the bottom of the computer.
Retaining the UUIDThe Universally Unique Identifier (UUID) is a 128-bit
number uniquely assigned to your computer at production
and stored in the EEPROM of your system board. The
algorithm that generates the number is designed to provide
FRU replacement notices
54ThinkPad A21e, A22e, i 1800 (MT 2655/2663/2664) 
						

							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
ThinkPad A21e, A22e, i 180055 
						

							Removing and replacing a FRU
This section presents directions and drawings for use in
removing and replacing a FRU. Be sure to observe the
following general rules:
1. Do not try to service any computer unless you have
been trained and certified. An untrained person runs
the risk of damaging parts.
2. Before replacing any FRU, review“FRU replacement
notices”on page 53.
3. Begin by removing any FRUs that have to be removed
before the failing FRU. Any such FRUs are listed at the
top of the page. Remove them in the order in which
they are listed.
4. Follow the correct sequence in the steps for removing
the FRU, as indicated in the drawings by the numbers
in square callouts.
5. When turning a screw to replace a FRU, turn it in the
direction indicated by the arrow in the drawing.
6. When removing the FRU, move it in the direction
indicated by the arrow in the drawing.
7. To put the new FRU in place, reverse the removal
procedure and follow any notes that pertain to
replacement. For information about connecting and
arranging internal cables, see“Locations”on page 115.
8. When replacing a FRU, use the correct screw as
shown in the procedures.
DANGER:
Before removing any FRU, power off the computer,
unplug all power cords from electrical outlets, remove
the battery pack, and then disconnect any
interconnecting cables.
Attention:Before the computer is powered on after FRU
replacement, make sure that all screws, springs, and other
small parts are in place and are not loose inside the
computer. Verify this by shaking the computer gently and
listening for rattling sounds. Metallic parts or metal flakes
can cause electrical short circuits.
Attention:The system board is sensitive to, and can be
damaged by, electrostatic discharge. Before touching it,
establish personal grounding by touching a ground point
with one hand or by using an electrostatic discharge (ESD)
strap (P/N 6405959).
Removing and replacing a FRU
56ThinkPad A21e, A22e, i 1800 (MT 2655/2663/2664)