IBM Thinkpad A21e 2000 Manual

Indicator Meaning

3Drive in useGreen:Data is being read from or
written to the hard-disk drive,
the diskette drive, or the drive
in the Ultrabay 2000. When
this indicator is on, do not put
the computer into standby
mode or turn off the computer.
Note:Do not move the system while the
Green drive in use light is on. Sudden
physical shock could cause drive errors.

4Num lockGreen:The numeric keypad on the
keyboard is enabled. To enable
or disable the keypad, press
and hold theFnkey while
pressing...

FRU Tests
The following table shows the test for each FRU.
FRU Applicable test
System board 1.Diagnostics-->CPU/Coprocessor
2.Diagnostics-->Systemboard
PowerDiagnostics-->Other Devices-->IBM AC
Adapter,IBM Battery 1 (IBM Battery 2)
LCD unit 1.Diagnostics-->Video Adapter
2.Interactive Tests-->Video
Modem 1. Make sure the modem is set up correctly.
2. Replace the modem jack and the modem
card in turn, and run the following test in
Diagnostics-->Communication:
a. Lucent Modem (M2) Loopback
b. Lucent Modem...

FRU Applicable test
Diskette drive 1.Diagnostics-->Diskette Drives
2.Interactive Tests-->Diskette
CD-ROM or
DVD drive1.Diagnostics-->Other Devices-->
CD-ROM/DVD
2.Interactive Tests-->CD-ROM/DVD Test
Memory 1. If two DIMMs are installed, remove one of
them and runDiagnostics-->Memory
Test - Quick.
2. If the problem does not recur, return the
DIMM to its place, remove the other one,
and run the test again.
3. If the test does not detect the error, run
Diagnostics-->Memory Test - Full.
Fan 1. Turn on the...

Fn key combinations
The following table shows the function of each combination
ofFnwith a function key.
TheFnkey works independently from the operating
system.
Key combination Description
Fn+F1Reserved.
Fn+F2Reserved.
Fn+F3Turn off the LCD display, leaving the
screen blank. To turn the LCD display on
again, press any key or the TrackPoint
stick.
Fn+F4Turn standby mode on. To return to
normal operation, press the Fn key.
Fn+F5Reserved.
Fn+F6Reserved.
Fn+F7Switch between the LCD and an external
monitor....

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.
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...

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.
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...

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 41.
Two short beeps with blank
screen.1.System board.
2. DIMM.
Three short beeps, pause,
three more short beeps, and
one short beep.1.DIMM.
2....

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...