Lenovo Y70-70 Touch Notebook User Manual download pdf (Page 25)

General checkout

Power system checkout

Toverifyasymptom,followthestepsbelow:

1. Turnoffthecomputer.

2. Removethebatterypack.

3. ConnecttheACadapter.

4. Makesurethatpowerissuppliedwhenyouturnonthecomputer.

5. Turnoffthecomputer.

6. DisconnecttheACadapterandinstallthechargedbatterypack.

7. Makesurethatthebatterypacksuppliespowerwhenyouturnonthe

computer.

Ifyoususpectapowerproblem,seetheappropriateoneofthefollowingpower

supplycheckouts:

• “CheckingtheACadapter”onpage21

• “Checkingoperationalcharging”onpage21

• “Checkingthebatterypack”onpage22

Checking the AC adapter

YouareherebecausethecomputerfailsonlywhentheACadapterisused.

• Ifthepower-onindicatordoesnotturnon,checkthepowercordoftheAC

adapterforcorrectcontinuityandinstallation.

• Ifthecomputerdoes notcharge duringoperation,goto“Checking

operationalcharging”.

TochecktheACadapter,followthestepsbelow:

1. UnplugtheACadaptercablefromthecomputer.

2. Measuretheoutputvoltage atthe plugoftheACadaptercable.Seethe

followinggure:

9ROWDJH9'&





3LQ





Note:

OutputvoltagefortheACadapterpinNo.2maydifferfromtheoneyou

areservicing.

3. Ifthevoltageisnotcorrect,replacetheACadapter.

4. Ifthevoltageisacceptable,dothefollowing:

• Replacethesystemboard.

• Iftheproblempersists,goto“LenovoY70-70Touch/Y70-80Touch”onpage26.

Note:

NoisefromtheACadapterdoesnotalwaysindicateadefect.

Checking operational charging

Tocheckwhetherthebatterycharges properlyduringoperation,usea

dischargedbatterypackorabatterypackthathaslessthan50%ofthetotal

powerremainingwheninstalledinthecomputer.

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Lenovo Y70-70 Touch Notebook User Manual Page 25

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