Just ask anyone who does a lot of I/R printing. The low battery alarm is an annunciator on the LCD, it does not beep. I don't know where he might have read that, but it just ain't so. There is no beeping alarm to warn of low battery voltage. I just caught up with this thread and would like to clarify some points in Mike's post:ġ) The 42S does not have a smoke detector feature. Pacific Time, Monday through FridayĮdited:, 3:23 p.m. After re-soldering, he corrected an unknown bad solder connection and was able to get his calculator to comply with the above reset procedure.Ĩ:00 a.m. One of the guys receintly posted his story of having to re-solder his do-it-yourself 32K memory chip exchange upgrade in order to stop his calculator from beeping, as he was not able to reset his calculator after his first soldering job. Second: is your calculator could have an open connection somewhere inside, maybe between the LCD and the PCB, and it will need servicing. Put the batteries back in and turn ON the calculator. Remove the batteries and lightly press a coin against both battery contacts in the calculator for a few seconds. Press the EXIT key to clear the display and your ready to go.Īlso: If you unknowingly turned the calculator ON while the batteries were out, the calculator can misbehave. That should stop the beeping and the display will show either "Machine Reset" in the top line's Y registry or in your case "Memory Clear", since it's been without power for a long time. Also make sure the battery terminals are free of any corrosion or hand oils, handle the batteries by their edge, use a little alcohole and Q-Tip to clean the battery contacts and faces if you fingered them.Īny way: Resetting the Calculator is simple and it does not matter if the calculator is ON or OFF: Simply hold down the EXIT key while you press and release the SQUARE ROOT key once, then release the EXIT key. Energizer's 357/303 also known as "357BP" or Duracell's D303/357B are best, or FRESH alkaline Duracell's PAX76A675AB also known as "76A" will do too. So make sure you have some FRESH batteries handy, Silver Oxide batteries, i.e. Persistant little bastard thinks it's a smoke detector!!! Actually, when the calculator is off, it can detect a low-battery condition and an internal system flag is set which will make the calculator beep non-stop. I'm no expert, but I remember reading in the archives that when the HP-42S calculator goes into it's beeping mode, it can mean one of two things:įirst: the calculator has a self protecting and anoying feature, as it sounds off automatically (beeping) warning you that my batteries are low and I need changing now! before I loose my continous memory and you loose your mind. 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.
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