Lenovo ThinkPad T400 Hardware Maintenance Manual

Checking operational charging
To check whether the battery charges properly during operation, use a discharged
battery pack or a battery pack that has less than 50% of the total power remaining
when installed in the computer.
Perform operational charging. If the battery status indicator or icon does not turn
on, remove the battery pack and let it return to room temperature. Reinstall the
battery pack. 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 it is still not charged, go to the next section.
Checking the battery pack
Battery charging does not start until the Power Manager Battery Gauge shows that
less than 96% of the total power remains; under this condition the battery pack can
charge to 100% of its capacity. This protects the battery pack from being
overcharged or from having a shortened life.
To check your battery, move your cursor to the Power Manager Battery Gauge icon
in the icon tray of the Windows taskbar and wait for a moment (but do not click),
and the percentage of battery power remaining is displayed. To get detailed
information about the battery, double-click the Power Manager Battery Gauge icon.
Note: If the battery pack becomes hot, it may not be able to charge. Remove it
from the computer and leave it at room temperature for a while. After it cools
down, reinstall and recharge it.
To check the battery pack, do the following:
1. Power off the computer.
2. Remove the battery pack and measure the voltage between battery terminals 1
(+) and 7 (-). See the following figure:
1(+)
2(+)
3
4
5
6(-)
7(-)
Terminal Voltage (V dc)
1 + 0 to + 12.6
7 Ground (-)
3. If the voltage is less than +11.0 V dc, the battery pack has been discharged.
Note: Recharging will take at least 3 hours, even if the indicator does not turn
on.
If the voltage is still less than +11.0 V dc after recharging, replace the battery.
4. If the voltage is more than +11.0 V dc, measure the resistance between battery
terminals 5 and 7. The resistance must be 4 to 30 K .
If the resistance is not correct, replace the battery pack. If the resistance is
correct, replace the system board.
General checkout 53

Lenovo ThinkPad T400 Specifications

General

Bus type	FSB
Stepping	R0
Tjunction	105 °C
Processor cache	3 MB
Processor cores	2
Processor model	P8700
Processor family	Intel® Core™2 Duo
Processor series	Intel Core 2 Duo P8000 Series
Processor socket	Socket 479
Processor codename	Penryn
Processing Die size	107 mm²
Processor frequency	2.53 GHz
Processor cache type	L2
Processor lithography	45 nm
Processor manufacturer	Intel
Processor front side bus	1066 MHz
Processor operating modes	64-bit
ECC supported by processor	No
Thermal Design Power (TDP)	25 W
CPU multiplier (bus/core ratio)	9.5
Number of Processing Die Transistors	410 M
HDD interface	SATA
Optical drive type	DVD-RW
Total storage capacity	320 GB
Display diagonal	14.1 \
Display resolution	1440 x 900 pixels
Native aspect ratio	16:10
Memory slots	2x SO-DIMM
Internal memory	2 GB
Internal memory type	DDR3-SDRAM
Maximum internal memory	4 GB
Memory layout (slots x size)	1 x 2 GB
Audio system	HD Audio
Speaker power	2 W
Type	PC
Modem speed	56 Kbit/s
Internal modem	Yes
Wireless technology	Intel WiFi Link 5300AGN
Intel segment tagging	Home Office, Small Business
Networking features	Gigabit Ethernet, WLAN
Operating system installed	Windows Vista Business
Battery life (max)	6.3 h
Number of battery cells	6
Charging port type	DC-in jack
Serial ports quantity	0
USB 2.0 ports quantity	3
Cable lock slot type	IBM
Password protection type	BIOS
AC adapter power	90 W
Pointing device	ThinkPad UltraNav
Discrete graphics card model	AMD Mobility Radeon HD 3470
Processor code	SLGFE
Processor ARK ID	37006
Processor package size	35 x 35 mm

Weight and Dimensions

Depth	238 mm
Width	335.5 mm
Height	31.9 mm
Weight	2380 g