IBM N51 Series User Manual

Power Systems Checkout
To check the system power, do the following.
1. Power-off the computer.
2. Remove the battery from the computer.
3. Check the battery voltage. The voltage should read 9
to 12 V dc across the negative and positive contacts
(the two contacts farthest apart).
If the voltages are not correct, try recharging the
battery pack.
If the voltages are correct, continue with the next step
to test the AC adapter voltage.
4. Unplug the AC adapter from the computer.
5. Measure the voltage at the points shown.
1
2
If the voltage is not correct, replace the AC adapter.
If the voltage is correct, go to “Undetermined
Problems” on page 214.
Standby Battery Check: To check the standby
battery voltage, measure across the two contacts. The
voltage should read 3.5 to 4.5 V dc.
If the voltage is not correct, replace the battery.
RTC Battery Check: To check the backup battery
voltage, measure across the two contacts. The voltage
should read 2.5 to 3.5 V dc.
If the voltage is not correct, replace the battery.
V dc + Lead – Lead
+13.5 to +15 2 1
Power Management Features
Press Fn + F1 to select the Configuration Utility. The
Power Management Features can be accessed from this
menu. Press F1 for additional online help.
ThinkPad 350, PS/Note 425 (2618)
209

IBM N51 Series Specifications

General

Brand	IBM
Model	N51 Series
Category	Laptop
Language	English