Lenovo ThinkPad 360 Hardware Maintenance Manual - Page 333

If the operational charge does not work, go to "Checking Operational Charging" on page 323. Note: There are several types of adapters. The procedure for checking both types is the same. 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. 2 AC Adapter (40W) Pin 1 2 1 Voltage (V dc) +18.0 to +21.0 Ground AC Adapter (35W) Pin Voltage (V dc) 1 +16.0 +1.0/−0.5 2 Ground If the voltage is correct, replace the system board. If the problem is not corrected, go to "Undetermined Problems" on page 343. If the voltage is not correct, go to the next step. 2. Unplug the AC Adapter cable from the ac power outlet and wait five minutes or longer to allow the over voltage protection circuit to be fully discharged and initialized. 3. Plug the AC Adapter cable into the ac power outlet. 4. Measure the output voltage of the AC Adapter. 5. If the voltage is still not correct, replace the AC Adapter. Note: An audible noise from the AC Adapter does not always indicate a defective adapter. Checking Operational Charging: To check operational charging, use a discharged battery pack or a battery pack that shows a yellow or orange battery status indicator when it installed in the computer. Perform operational charging. If the battery status indicator turns orange and the battery charging indicator turns green within two minutes, replace the AC Adapter. ThinkPad 755CD, 755CDV (9545) 323