1(+)
2(+)
3
4
5
6(-)
7(-)
Terminal
Voltage (V dc)
1, 2
+ 0 to + 12.6
6, 7
Ground (-)
3. If the voltage is less than +11.0 V dc, the removable battery has been discharged.
If the voltage is still less than +11.0 V dc after recharging, replace the removable battery.
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 removable battery. If the
resistance is correct, replace the system board.
Checking the operational charging
To check whether the battery charges properly during operation, do the following:
1. Discharge the battery until the remained battery power is less than 50%.
2. Connect the computer to ac power to charge the battery. If the battery status icon in the Windows
notification area indicates that the battery is not charging, remove the battery and let it return to room
temperature.
3. Reinstall the battery. If the battery is still not charging, replace the battery.
4. Check the battery status icon again. If the same error still exists, replace the system board.
Checking the coin-cell battery
To check the coin-cell battery, do the following:
1. Disable the built-in battery. See “Disabling the built-in battery” on page 62.
2. Remove the coin-cell battery. See “1100 Coin-cell battery” on page 74.
3. Measure the voltage of the coin-cell battery. See the following illustration.
Wire
Voltage (V dc)
Red
+2.5 to +3.2
Black
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.
30
A485 Hardware Maintenance Manual
Summary of Contents for 20MU
Page 1: ...A485 Hardware Maintenance Manual ...
Page 6: ...iv A485 Hardware Maintenance Manual ...
Page 11: ...DANGER DANGER DANGER DANGER DANGER Chapter 1 Safety information 5 ...
Page 12: ...6 A485 Hardware Maintenance Manual ...
Page 13: ...PERIGO PERIGO Chapter 1 Safety information 7 ...
Page 14: ...PERIGO PERIGO PERIGO PERIGO PERIGO 8 A485 Hardware Maintenance Manual ...
Page 15: ...PERIGO DANGER DANGER DANGER DANGER Chapter 1 Safety information 9 ...
Page 16: ...DANGER DANGER DANGER DANGER VORSICHT 10 A485 Hardware Maintenance Manual ...
Page 17: ...VORSICHT VORSICHT VORSICHT VORSICHT Chapter 1 Safety information 11 ...
Page 18: ...VORSICHT VORSICHT VORSICHT 12 A485 Hardware Maintenance Manual ...
Page 19: ...Chapter 1 Safety information 13 ...
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Page 21: ...Chapter 1 Safety information 15 ...
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Page 23: ...Chapter 1 Safety information 17 ...
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Page 74: ...Removal steps of the M 2 solid state drive 68 A485 Hardware Maintenance Manual ...
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Page 108: ...Part Number SP40Q51807 Printed in 1P P N SP40Q51807 ...
Page 109: ... 1PSP40Q51807 ...