Acer TravelMate 4320 TravelMate 4320/4720 and Extensa 4220/4620 Service Guide - Page 117
Modem-Related Symptoms, Symptom / Error, Action in Sequence, Keyboard/Touchpad-Related Symptoms
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Keyboard/Touchpad-Related Symptoms Symptom / Error Touchpad does not work. Action in Sequence Reconnect touchpad cable. Touchpad board Mainboard Modem-Related Symptoms Symptom / Error Action in Sequence Internal modem does not work correctly. Modem phone port Modem combo board Mainboard NOTE: If you cannot find a symptom or an error in this list and the problem remains, see "Undetermined Problems" on page 109. Chapter 4 107