So, if nothing else helps, I would suggest attempting a 32K upgrade :-) (Probably, Randy Sloyer could help you with that if you feel uncomfortable opening up the calc yourself). The reason then was that one of the legs of the new RAM chip was not soldered sufficiently. This behaviour - where the 42S beeps constantly - is exactly the same problem as I had when upgrading one of my 42S's to 32K RAM. Message #13 Posted by Erik Ehrling (Sweden) on, 4:14 a.m., Hope you get it working - the 42S is a great machine. Perhaps others who have used them can give feedback. I haven't sent any repairs to Fixthatcalc, so can't give a recommendation. Message #12 Posted by Graham Wilson on, 2:51 a.m., I'm taking a nap and getting back to the keyboard in a few hours, if you don't mind. I'm just resting for a while as I'm writing a brief tutorial (in Portuguese) related to LaTeX instalation and use in a Linux environment. I think I'll be ready to get my daily HP-related activities back after the mid December, while I'm resuming some HP-related activities in the course. Anyway, be sure that I'd help as well, but as I mentioned, my spare time is "none". I'm sure you'll find people closer to you that will help you in any way you need. I'm collecting the HD's and related chips ID's so I can further search for their characteristics. No, they are not MFM units, instead some 170MBytes to 480MBytes IDE units. BTW, to those interested on this sort of upgrading, I found compatible 32KRAM chips in some "ancient" HD boards. That's why I remember reading about the continuous beep. I myself repaired some HP42S, and I also upgraded at least five units to 32KBytes RAM. The only way is trying the "off-line" repair centers. The fact is that (sadly) HP no longer offers service for the HP42S. I read here some guys mentioning a sort of "repair center", not an HP repair center, that offers service for some HP calculators. In response to message #10 by Steve in Seattle Is there someplace we could send it in for repairs? I think I will try the battery terminal short curcuit first. Thanks Luiz Trying to take it apart and soldering it is probably over my head. In response to message #9 by Vieira, Luiz C. Message #10 Posted by Steve in Seattle on, 12:25 a.m., Opening the case is another story, and many guys in here have the skills and experience to share, if you wanna try it. These pioneers (HP27S, 42S and 17B/BII) are quite fearless, and they generally survive to soldering. This is sort of a "final solution", but may bring your 42S back to life. I cannot tell you for sure, but that's what came to my mind right now. Some time ago, one of our contributors mentioned this sort of symptom, and in his case (was it Randy Sloyer?) it was necessary to resolder the RAM chip. Thanks a lot John I really appreciate the help.
In response to message #7 by John Limpert Message #8 Posted by Steve in Seattle on, 3:26 a.m., Put the batteries back in and turn the calculator on.
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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