Lenovo ThinkPad i Series 172x ThinkPad 390 / i Series 1720 models Hardware Mai - Page 37

Checking the AC Adapter, Checking the Operational Charging

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3. Disconnect the AC Adapter and install the charged battery ASM; then check that power is supplied by the battery ASM. If you suspect a power problem, refer the the appropriate power supply check listed below: "Checking the AC Adapter" "Checking the Operational Charging" "Checking the Battery ASM" on page 30 Checking the AC Adapter: You are here because the computer fails only when the AC Adapter is used: If the power problem occurs only when the ThinkPad Port Replicator with Advanced Etherjet Feature. If the power-on indicator does not turn on, check the power cord of the AC Adapter for correct continuity and installation. If the operational charge does not work, go to "Checking the Operational Charging." Unplug the AC Adapter cable from the computer and measure the output voltage at the plug of the AC Adapter cable. See the following figure. Pin Voltage (V dc) 1 +14.5 to +17.0 2 Ground 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 planar board. If the problem is not corrected, go to "Undetermined Problems" on page 40 Note: An audible noise from the AC Adapter does not always indicate a defective adapter. 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. ThinkPad 390/i Series 1700 29

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3.
Disconnect the AC Adapter and install the charged
battery ASM; then check that power is supplied by the
battery ASM.
If you suspect a power problem, refer the the appropriate
power supply check listed below:
±
“Checking the AC Adapter”
±
“Checking the Operational Charging”
±
“Checking the Battery ASM” on page
30
Checking the AC Adapter:
You are here
because the computer fails only when the AC Adapter is
used:
±
If the power problem occurs only when the ThinkPad
Port Replicator with Advanced Etherjet Feature.
±
If the power-on indicator does not turn on, check the
power cord of the AC Adapter for correct continuity
and installation.
±
If the operational charge does not work, go to
“Checking the Operational Charging.”
Unplug the AC Adapter cable from the computer and
measure the output voltage at the plug of the AC Adapter
cable. See the following figure.
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 planar board.
±
If the problem is not corrected, go to “Undetermined
Problems” on page
40
Note:
An audible noise from the AC Adapter does not
always indicate a defective adapter.
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.
Pin
Voltage (V dc)
1
+14.5 to +17.0
2
Ground
ThinkPad 390/i Series 1700
29