IBM 390E manual Checking the Operational ChargingTo

Checking the 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 does not turn on, remove the Battery ASM and let it return to room temperature. Reinstall the Battery ASM.

If

the

charge

indicator

still

does not turn on,

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:				Battery ASM
charging		will	not	start	until the Fuel-Gauge shows that less
than	95%	of	the	total	power remains; with this condition,

the Battery ASM can charge to 100% of its capacity. This protects the Battery ASM from being overcharged or

having a shortened life.

Do the following:

1.Power off the computer.

2.Remove the Battery ASM and measure the voltage between battery terminals 1(+) and 7(-). See the fol- lowing figure:

Note: Signal
	lines, not used in these steps, are used
for	communications between the system and
the	battery.

3.If the voltage is less than 10.6V (Li-Ion) or 9.6V (NiMH), the Battery ASM has been discharged,

recharge the Battery ASM. If the voltage is still less than 10.6V (Li-Ion) or 9.6V (NiMH), replace the battery.

4.If the voltage is more than 10.6V (Li-Ion) or 9.6V (NiMH), measure the resistance between battery ter- minals 5 and 7. The resistance must be 390 ohm (Li-Ion) or 4 to 3K ohm. If the resistance is not correct, replace the Battery ASM. If the resistance is correct, replace the DC-DC & BATT board then the

system board.

34 ThinkPad 390E