Hardware Maintenance Manual - Lenovo B580
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...computer unusable) • Sticky keys caused by spilling a liquid onto the keyboard • Use of an incorrect ac power adapter on laptop products The following symptoms might indicate damage caused by nonwarranted activities: • Missing parts might be a symptom of unauthorized service or ...computer. Turn off the computer. 2. Measure the output voltage at the plug of the ac power adapter may have been subjected to Chapter 5 "Lenovo B580" on the computer. 5. Power system checkout To verify a symptom, do the following : 1. See the following power supply checkouts: •...
...computer unusable) • Sticky keys caused by spilling a liquid onto the keyboard • Use of an incorrect ac power adapter on laptop products The following symptoms might indicate damage caused by nonwarranted activities: • Missing parts might be a symptom of unauthorized service or ...computer. Turn off the computer. 2. Measure the output voltage at the plug of the ac power adapter may have been subjected to Chapter 5 "Lenovo B580" on the computer. 5. Power system checkout To verify a symptom, do the following : 1. See the following power supply checkouts: •...