HP Forum Archive 14

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HP 42s RPN beeping Message #1 Posted by Raze on 9 Feb 2004, 7:24 p.m. Hello All, Please, I need some help. It is normal that the HP 42s RPN keeps beeping all the time without showing anything in the LCD screen? It is because of the batteries or need programing? or it is just broken? Thanks in advance, Raze

Re: HP 42s RPN beeping Message #2 Posted by Randy Sloyer on 9 Feb 2004, 11:47 p.m., in response to message #1 by Raze To quote an old TV program: "It's dead, Jim" Most likely fractured solder connections on the 8k ram chip. See http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=5 for how to open. Just a caution, the repair requires some very fine, surface mount soldering rework.

Re: HP 42s RPN beeping Message #3 Posted by Chris Randle (UK) on 10 Feb 2004, 3:31 p.m., in response to message #2 by Randy Sloyer Mine started doing this the other day. Bought new batteries and it's back to its old self. So it _may_ not be broken.

Re: HP 42s RPN beeping Message #4 Posted by Randy Sloyer on 10 Feb 2004, 5:38 p.m., in response to message #3 by Chris Randle (UK) If yours starts beeping again, press on the back of the case in the area of the 5 key. If it stops beeping and wakes up, it_is_definitely_broken :^(

Re: HP 42s RPN beeping Message #5 Posted by Victor Koechli on 10 Feb 2004, 6:45 p.m., in response to message #2 by Randy Sloyer Randy is right. I had a 42S with exactly the same symptom. Resoldered the RAM chip, and everything is fine. Cheers, and good luck, Victor

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