Lenovo ThinkPad 380ED ThinkPad 380, 385, 560, 560E, all 760, 765 and SelectADo - Page 439

Checking the Standby Battery (Rechargeable) 1. Power off the computer and unplug the AC Adapter from the computer. 2. Open the keyboard, and remove the diskette drive/CD-ROM drive, the battery pack, and the hard disk drive. 3. Remove the top cover and keyboard unit. 4. Open the keyboard unit; then remove the keyboard card. 5. Remove the standby battery from the keyboard card. (Refer to "2060 Backup Battery, Speaker, Standby Battery" on page 494 to remove the battery.) Warning: Be careful not to cause a short circuit when measuring the voltage. 6. Measure the voltage of the standby battery. If the voltage between red and black wire of the battery is 3.5 V dc or greater, the voltage is correct. Go to step 12 to verify standby battery operation. If the voltage is less than 3.5 V dc, go to the next step. 7. Plug the AC Adapter into the computer and power on the computer. Warning: Be careful not to cause a short circuit when measuring the voltage. 8. Measure the output voltage at the connector on the keyboard card with the battery unplugged. Pin Voltage (V dc) + +4.0 − Ground If the voltage is less than +4.0 V dc, replace the DC/DC card. If the voltage is still low, replace the system board. ThinkPad 765D (9546), 765L (9547) 427