Lenovo ThinkPad 600E Hardware Maintance Manual - June 1999: ThinkPad 600, 600E - Page 42
Checking the AC Adapter, Checking Operational Charging
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Checkout Guide 3. Disconnect the AC Adapter and install the charged battery pack; then check that power is supplied by the battery pack. If you suspect a power problem, see the appropriate power supply checkout in the following list: "Checking the AC Adapter" "Checking Operational Charging" "Checking the Battery Pack" on page 37 "Checking the Backup Battery" on page 38 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 port replicator is used, replace the port replicator. 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 Operational Charging. 1. 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: (16 - 10 V) Pin Voltage (V dc) 1 +15.5 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 system board. If the problem is not corrected, go to "Undetermined Problems" section of each model. 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 or a battery pack 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, remove the battery pack and let it return to room temperature. Reinstall the battery 36