IBM Thinkpad X20 X21 X22 X23 X24 Manual

If the charge indicator or icon still does not turn on, replace
the battery pack. If the charge indicator still does not turn
on, replace the system board. Then reinstall the battery
pack. If the reinstalled battery pack has not been charged,
go to the next section.
Checking the battery pack:Battery charging does not
start until the Fuel Gauge shows that less than 95% of the
total power remains; under this condition the battery pack
can charge to 100% of its capacity. This protects the
battery pack from...

2. Turn the computer upside down.
3. Remove the backup battery (see“1030 Backup battery”
on page 60).
4. Measure the voltage of the backup battery. See the
following figure.
k(-)
@
Red(+)
Blac
Wire Voltage (V dc)
Red +2.5 to +3.2
Black Ground
a. If the voltage is correct, replace the system board.
b. If the voltage is not correct, replace the backup
battery.
c. If the backup battery discharges quickly after
replacement, replace the system board.
38ThinkPad X20, X21, X22, X23, X24 

Chapter 3. ThinkPad X20, X21, X22,
X23, X24
Product overview............42
Specifications............42
Statusindicators...........45
Fn key combinations..........47
Symptom-to-FRU index..........48
Numeric error codes..........48
Error messages...........50
Beep symptoms...........51
No beep symptoms.........51
LCD-related symptoms.........52
Intermittentproblems..........52
Undetermined problems.........53
FRU replacement notices.........54
Screwnotices............54
Retaining serial...

For X22, X23, X24.........85
1160IRDAPort...........85
For X22, X23, X24.........86
1170 RJ11, RJ45...........87
For X20, X21...........87
For X22, X23, X24.........88
1180 System board..........89
For X20, X21...........89
For X22, X23...........90
ForX24.............90
1190 LCD USB cover..........91
1200 Front bezel...........92
1210 LCD panel...........93
XGA for X20, X21..........94
SVGA for X20, X21.........95
XGA for X22, X23, X24........97
Locations..............98
Front view for X20,...

Windows 98 recovery CDs.......126
Windows 2000 recovery CDs......126
Windows XP Pro recovery CDs.....127
Windows XP Home recovery CDs....127
Recovery CDs for X23 Series.......128
Windows 2000 recovery CDs......128
Windows XP Pro recovery CDs.....128
Windows XP Home recovery CDs....129
Recovery CDs for X24 Series.......129
Windows 2000 recovery CDs......129
Windows XP Pro recovery CDs.....130
Windows XP Home recovery CDs....131
Miscellaneous parts..........131
For X20, X21...........131
For X22,...

Product overview
This section presents the following product-unique
information:
vSpecifications
vStatus indicators
vFn key combinations
Specifications
The following table lists the specifications of the ThinkPad
X20, X21, X22, X23, X24 series:
Feature Description
ProcessorX20, X21
vIntel
®mobile Pentium®ΙΙΙ700MHz, L2
256–KB cache
vIntel
®Celeron processor 600MHz, L2
128–KB cache
vIntel
®Celeron processor 500MHz, L2
128–KB cache
X22
vIntel
®mobile Pentium®ΙΙΙ-M 733MHz,
L2 512KB cache
vIntel
®mobile...

Memory (standard)X20, X21
v64 MB (on the system board)
v128 MB (on the system board)
X22, X23, X24
v128 MB (on the system board)
v256 MB (on the system board plus
128 MB DIMM)
Memory (optional)X20, X21
v64 MB, 128 MB, or 256 MB SDRAM
card (maximum of 320/384 MB)
X22, X23, X24
v64 MB, 128 MB, 256 MB or 512 MB
SDRAM card (maximum of 640 MB)
CMOS RAMX20, X21
v114 bytes +4 Kbytes
X22, X23, X24
v256bytes
DisplayX20, X21
v12.1-inch, 16M colors SVGA
(800×600 resolution) TFT color LCD
v12.1-inch, 16M colors XGA...

AudioX20, X21
vCS4281/CS4297A Mono Speaker
X22, X23, X24
CS4299 Mono Speaker
PC CardX20, X21, X22, X23, X24
T2, Cardbus
AC adapterX20, X21
72W AC/DC
X22, X23, X24
56W AC/DC
Status indicators
The system status indicators show the current computer
status in different colors (green or orange):
5
3
6
7
89
4
12
TM
T
M
Indicator Meaning

1BatteryGreen:The battery is fully charged.
Blinking green:The battery has enough
power to operate but is charging.
Orange:The battery power is low. The
battery is charging....

2Standby statusGreen:The computer is in standby mode.
Blinking green:The computer is entering
standby mode or hibernation mode, or is
resuming normal operation.

3Bluetooth(X23,
X24 Bluetooth
Model Only)Green:The Integrated Bluetooth features are
on.
Blinking green:The Integrated Bluetooth
features are functioning.

4Bluetooth
power button(X23,
X24 Bluetooth
Model Only)Press this button to turn the IBM Integrated
Bluetooth on and off.

5Drive in useGreen:Data is read from or written to the
hard disk...

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 inDiagnostics --> Other
Devices.
a. Lucent Modem (M2) Loopback
b. Lucent Modem (M2) Dialtone/DTM
c. Lucent Soft Modem Loopback
d. Lucent Soft Modem Dialtone
e. Intel Modem Register
f. Intel Modem Loopback/DTMF
g. Intel SP Modem Register
h. Intel SP Modem Loopback/DTMF
i. 3Com MiniPCI Modem Test
j. 3Com MiniPCI Dialtone Test
Audio
1.Interactive Tests-->Internal Speaker...