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2.Removethebatterypackandmeasurethevoltagebetweenbatteryterminals1(+)and7(-).Seethe

followinggure:

Terminal

Voltage(Vdc)

1+0to+16.8

Ground(-)

1(+)

2(+)

6(-)

7(-)

3.Ifthevoltageislessthan+11.0Vdc,thebatterypackhasbeendischarged.

Note:Rechargingwilltakeatleast3hours,eveniftheindicatordoesnotturnon.

Ifthevoltageisstilllessthan+11.0Vdcafterrecharging,replacethebattery.

4.Ifthevoltageismorethan+11.0Vdc,measuretheresistancebetweenbatteryterminals5and7.

Theresistancemustbe4to30KΩ.Iftheresistanceisnotcorrect,replacethebatterypack.Ifthe

resistanceiscorrect,replacethesystemboard.

Checkingthebackupbattery

Dothefollowing:

1.Poweroffthecomputer,andunplugtheacpoweradapterfromit.

2.Turnthecomputerupsidedown.

3.Removethebatterypack(see“1020Batterypack”onpage63).

4.Removethebackupbattery(see“1080Backupbattery”onpage73).

5.Measurethevoltageofthebackupbattery.Seethefollowinggure.

Wire

Voltage(Vdc)

Red+2.5to+3.2

Black

Ground

•Ifthevoltageiscorrect,replacethesystemboard.

•Ifthevoltageisnotcorrect,replacethebackupbattery.

•Ifthebackupbatterydischargesquicklyafterreplacement,replacethesystemboard.

Chapter3.Generalcheckout37

Lenovo ThinkPad X220 Tablet Hardware Maintenance Manual

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