Remove the batteries again and lightly press a coin against both battery contacts in the calculator for a few seconds. If it does not function, you might have taken too long to change the batteries or inadvertently turned the calculator on while the batteries were out. I double-checked the HP-42S Owner's Handbook.
In response to message #6 by Steve in Seattle Message #7 Posted by John Limpert on, 1:28 a.m., Message #6 Posted by Steve in Seattle on, 12:16 a.m., This way, the chances for an ESD (ElectroStatic Discharge) and consequent damage to the calculator are fairly reduced. If this procedure is briefly executed, as John mentioned, the batteries will not be damaged and no more than 4.5 Volts will be applied to the batteries terminals. keeping the batteries in the compartment while briefly shorting the calculator's terminals. In response to message #4 by John Limpert Try removing the batteries and briefly short circuit the battery terminals inside the calculator with a piece of wire. In response to message #3 by Steve Mathews Message #4 Posted by John Limpert on, 10:53 p.m.,
I checked the buttons and they all seem to be depresssing and springing back out. Raymond I am positive its an HP-42S RPN Scientific calculator. In response to message #2 by Raymond Del Tondo Message #3 Posted by Steve Mathews on, 10:21 p.m., In response to message #1 by Steve in SeattleĬould there be a stuck key, which forces the beep? Message #2 Posted by Raymond Del Tondo on, 10:14 p.m., The only way to get it to stop is pull the batteries out. I keep trying to put the new batteries in and it keep doing the same thing. Is there a way of resetting the calculator. The batteries were dead so I put in new 1.5 volt batteries and all it does is constantly beep which I think it is suppose to do when there is an error. My father just gave me a 1985 HP-42S calculator. Message #1 Posted by Steve in Seattle on, 9:43 p.m. Help with HP-42S The Museum of HP Calculators
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