IBM ThinkPad i Series 1500 User Manual download pdf (Page 40)

If the voltage is not correct, replace the AC Adapter.

If the voltage is within the range, do the following:

 Replace the DC-DC & BATT board.

 Replace the system board.

 If the problems still persist, go to “Undetermined

Problems” on page 38.

Note: An audible noise from the AC Adapter does not

always indicate a defect.

Checking operational charging: To check

operational charging, use a discharged battery pack

(Battery ASM) or a Battery ASM that has less than 50% of

the total power remaining when installed in the computer.

Perform operational charging. If the battery status indicator

or icon does not turn on or does not show orange color,

remove the Battery ASM and let it return to room temper-

ature. Reinstall the Battery ASM. If the charge indicator or

icon still does not turn on or still does not show orange

color, replace the Battery ASM.

If the charge indicator still does not turn on, replace the

DC-DC & BATT board, then the system board. Then

reinstall the Battery ASM. If the reinstalled Battery ASM is

not charged, go to the next section.

Checking the Battery ASM: After the battery is

fully charged, charger can not charge battery until the Fuel

Gauge shows that less than 95% of total power remains;

with this condition the battery pack can charge to 100% of

its capacity. This protects the Battery ASM from being

overcharged or from having a shortened life.

Note: The Battery ASM might not be able to charged

when it is hot. In that case, remove it from the

computer and leave it at room temperature for a

while. After it cools down, reinstall it and recharge

it.

Do the following:

1. Power off the computer.

2. Remove the battery pack and measure the voltage

between battery terminals 1 (+) and 7 (-). See the fol-

lowing figure.

Pin Voltage (V dc)

1 15.5V — 17.0V

2 Ground

ThinkPad i Series 1400/1500 31

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 171 172

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IBM ThinkPad i Series 1500 User Manual Page 40