Re: hp97 red light Message #2 Posted by Maximilian Hohmann on 29 Mar 2006, 5:28 a.m., in response to message #1 by wancho
Hello!
This is normally a sign of too low voltage. Most probably, the recharchable battery pack is dead (internally short circuited). The humming sound comes from the overloading charger.
Disconnect the charger immediately and replace the battery cell! If the seller or previous owner has "experimented" with the calculator in this condition, there is a good chance, that the charger or some circuits inside the calcultor have suffered permanent damage.
Greetings, Max
Important: Do NOT connect the HP-97 to the charger without a (good!) battery pack in place.
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