1
2
3
4
5
6
7
Note: Signal lines, not used in these steps, are used
for communications between the system and
the battery.
3. First, discharge the battery, until the voltage is less
than 10.8V (LiIon) or 9.6V (NiMH). Then, charge the
battery for 30 minutes. Now, check the voltage. If the
voltage is still less than 10.8V (Li-Ion) or 9.6V (NiMH),
replace the battery.
4. If the voltage is more than 10.8V (LiIon) or 9.6V
(NiMH), measure the resistance between battery ter-
minals 5 and 7. The resistance must be 390
Ω
(Li-Ion)
or 10K
Ω
(NiMH). If the resistance is not correct,
replace the Battery ASM. If the resistance is correct,
replace the DC-DC & BATT board, then the system
board.
Terminal
Signal / Voltage (V dc)
1
BT-
2
BT-SENSE
3
BT-SCLK
4
BT-SDATA
5
BT-TH
6
BT+SENSE
7
BT+
32
ThinkPad i Series 1400/1500 HMM
