Li-Ion Battery Pack
Note: Li-ion battery is optional for Model 755CV and
standard for Model 755CX.
(T)
Note: Signal lines, not used in these steps, are used for
communication between the system and the battery. The
storage switch is used to control the power to the internal
microprocessor of the battery. The storage switch should
be set to off (0) only when the battery is going to be kept
in storage for more than two months.
3. If the voltage is less than +8.0 V dc, the battery pack
has been discharged or is defective. Recharge the
battery. If the recharging does not work, go to Step 5
to check the charging circuit.
If the voltage is still less than +8.0 V dc after the
recharging, replace the battery.
4. If the voltage is more than +8.0 V dc, measure the
resistance between battery terminals 3 and 4. The
resistance must be 4 to 30 K ohm.
If the resistance is not correct, replace the battery
pack.
If the resistance is correct, replace the DC/DC card.
5. To check the charging circuit, do the following.
Note: Be careful not to cause a short circuit. Plug in
the AC Adapter with the battery pack removed, then
power-on the computer.
6. Measure the charging voltage between DC/DC
terminals 1 (+) and 4 (−).
7. If the voltage is less then +9.0 V dc, replace the
DC/DC card. If the voltage is more than +9.0 V dc,
Terminal Voltage (V dc) / Signal
1 +8.0 to +13.0
2 Send
3 Thermal
4 Ground (−)
5 Select (+)
ThinkPad 755CE, 755CSE, 755CV, 755CX (9545) 401
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