Checking The Backup Battery - Lenovo ThinkPad Edge E320 Hardware Maintenance Manual
Hardware maintenance manual - thinkpad edge e320, e325
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- (204 pages) ,
- Benutzerhandbuch (202 pages) ,
- Manual d'utilisation (194 pages)
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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 Ω. If the resistance is not correct, replace the battery pack. If the
resistance is correct, replace the system board.
Checking the backup battery
Do the following:
1. Power off the computer, and unplug the ac power adapter from it.
2. Turn the computer upside down.
3. Remove the battery pack (see "1010 Battery pack" on page 48).
4. Remove the backup battery (see "1080 Backup battery" on page 57).
5. Measure the voltage of the backup battery. See the following figure.
• If the voltage is correct, replace the system board.
• If the voltage is not correct, replace the backup battery.
• If the backup battery discharges quickly after replacement, replace the system board.
30
Hardware Maintenance Manual
Wire
Voltage (V dc)
Red
+2.5 to +3.2
Black
Ground
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