IBM 2621421 Hardware Maintenance Manual - Page 33

Symptoms (Verified) Other symptoms Go to Appropriate check instructions in this section, then use appropriate tables in "Symptom-to-FRU Index" on page 36. Power Systems Check To verify the symptom of the problem power on the computer using each of the power sources as follows: 1. Remove the battery pack, diskette drive, and hard disk drive. 2. Connect the AC Adapter and check that power is supplied. 3. Install the diskette drive or hard disk drive one at a time, and chekc that power is uspplied from each power source. If you suspect a power problem, refer the the appropriate power supply check listed below: "Checking the AC Adapter" "Checking the Operational Charging" on page 26 "Checking the Battery Pack" on page 26 Checking the AC Adapter: If the computer fails only when the AC Adapter is used or if the power-on indicator of the AC Adapter does not turn on, make sure of the following: Power cord is not damaged. Power cord is securely connected to the AC Adapter and AC power outlet. If the above confirmation does not solve the problem, replace the AC Adapter. If the power-on indicator of the AC Adapter is on, then proceed to the next step. 1. Unplug the AC Adapter cable from the computer and measure the output voltage at the plug of the AC Adapter cable. Pin Voltage (V dc) 1 19.0 20.5 2 Ground ThinkPad i Series 1400 (Part I) 25