IBM THINKPAD 760C/CD (9546) - Manual (Page 49)

4. Measure the output voltage of the AC Adapter.
5. If the voltage is still not correct, replace the AC
Adapter.
Note: An audible noise from the AC Adapter does not
always indicate a defective adapter.
Checking Operational Charging: To check
operational charging, use a discharged battery pack or a
battery pack that shows an amber battery status indicator
when it is installed in the computer.
Perform operational charging. If the battery status
indicator turns orange and the battery charging indicator
turns green within two minutes, replace the AC Adapter.
Checking the Battery Pack: Battery charging will
not start until the Fuel-Gauge shows that less than 90% of
the total power remains; with this condition the battery
pack will charge to 100% of its capacity. This protects the
battery pack from being over-charged or having a
shortened life.
Before you perform the following procedure, be sure you
have the correct battery pack for this model.
1. Power-off the computer.
2. Remove the battery pack and measure the voltage
between battery terminals 2 ( + ) and 6 ( − ). See the
following figure.
3. If the voltage is less than + 7.2 V dc, the battery pack
has been discharged or is defective. Recharge the
battery. If the recharging does not work, go to Step 5
on page 38 to check the charging circuit.
If the voltage is still less than + 7.2 V dc after the
recharging, replace the battery.
4. If the voltage is more than + 7.2 V dc, measure the
resistance between battery terminals 4 and 6. The
resistance must be 4K ohms to 30K ohms.
If the resistance is not correct, replace the battery
pack.
If the resistance is correct, replace the DC/DC card.
ThinkPad 365 (2625) 37