Lenovo ThinkPad W541 (English) Hardware Maintenance Manual - ThinkPad T540p, W - Page 34
Checking the coin-cell battery, Remove the coin-cell battery. See 1100 Coin-cell battery
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Checking the coin-cell battery To check the coin-cell battery, do the following: 1. Remove the battery pack. See "1010 Battery pack" on page 58. 2. Remove the coin-cell battery. See "1100 Coin-cell battery" on page 67. 3. Measure the voltage of the coin-cell battery. See the following illustration. Wire Red Black Voltage (V dc) +2.5 to +3.2 Ground • If the voltage is correct, replace the system board. • If the voltage is not correct, replace the coin-cell battery. • If the coin-cell battery discharges quickly after replacement, replace the system board. 28 Hardware Maintenance Manual
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Checking the coin-cell battery
Tocheckthecoin-cellbattery,dothefollowing:
1. Remove the battery pack. See “1010 Battery pack” on page 58.
2. Remove the coin-cell battery. See “1100 Coin-cell battery” on page 67.
3. Measure the voltage of the coin-cell battery. See the following illustration.
Wire
Voltage (V dc)
Red
+2.5to+3.2
Black
Ground
• If the voltage is correct, replace the system board.
• If the voltage is not correct, replace the coin-cell battery.
•Ifthecoin-cellbatterydischargesquicklyafterreplacement,replacethesystemboard.
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HardwareMaintenanceManual