HP 38C calculator disassembly?
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From: William Sommerwerck on 28 Oct 2009 14:23 >> The HP35s has both Enter and "=" keys (although the "=" key >> is somewhat hidden).^ > Where? I bought my HP35 in 1974 and haven't found this key till now! He should have said HP-35S. See above.
From: AZ Nomad on 28 Oct 2009 15:49 On Wed, 28 Oct 2009 19:12:51 +0100, Reinhard Zwirner <reinhard_zwirner(a)web.de> wrote: >Jeff Liebermann schrieb: >> >[...] >> The HP35s has both Enter and "=" keys (although the "=" key is >> somewhat hidden). ^^ ^^ >Hi Jeff >Where? I bought my HP35 in 1974 and haven't found this key till now! HP35s != HP35
From: Reinhard Zwirner on 28 Oct 2009 16:15 AZ Nomad schrieb: > > On Wed, 28 Oct 2009 19:12:51 +0100, Reinhard Zwirner <reinhard_zwirner(a)web.de> wrote: > >Jeff Liebermann schrieb: > >> > >[...] > >> The HP35s has both Enter and "=" keys (although the "=" key is > >> somewhat hidden). ^^ ^^ > > >Hi Jeff > > >Where? I bought my HP35 in 1974 and haven't found this key till now! > > HP35s != HP35 Many thanks to you and William! I did misinterpret the s as a plural s. Now I know that there is a HP 35 revival calculator ;-) ... Best regards Reinhard
From: Jeff Liebermann on 28 Oct 2009 20:12 On Wed, 28 Oct 2009 19:12:51 +0100, Reinhard Zwirner <reinhard_zwirner(a)web.de> wrote: >Jeff Liebermann schrieb: >> >[...] >> The HP35s has both Enter and "=" keys (although the "=" key is >> somewhat hidden). ^^ ^^ >Where? I bought my HP35 in 1974 and haven't found this key till now! >Very interested >Reinhard The HP35 does NOT have an "=" key. The new and allegedly improved HP35s does. See: <http://www.hpcc.org/datafile/V26Special/the35s.pdf> It's above the +/- key, to the right of the Enter key. The HP35s was suppose to be an update of the classic HP35 calculator. Unfortunately, just about everything is different. It's also full of bugs and annoyances: <http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=735> <http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv017.cgi?read=126708> I use mine effectively, but I'm still disappointed (and disgusted). -- Jeff Liebermann jeffl(a)cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558
From: Peabody on 28 Oct 2009 21:03
Jeff Liebermann says... > You're going to have a problem getting the keyboard > section apart. The case comes off easily. Two screws in > the battery compartment and it breaks open. Watch out > for the loose IC's. Take photos if you can't remember > the chip directions. > The keyboard is held together by melted plastic blobs. > Break them off and the keyboard section will come apart, > but good luck getting it back together. You're better > off immersing the entire assembled keyboard in some > alcohol, and hope that the crud will wash away. > Eventually, the alcohol (and water) will evaporate. I think you are describing the early version of the 38C, and perhaps other Spice series calculators. At some point HP switched over to a new design which had all the chips soldered in the usual way. And that's what I have. I didn't find the case to come apart easily at all. I ended up using the dental floss method of getting it apart. That's from the hpmuseum.org forum. The keyboard on mine has a metal dome for each key, and all the domes are held in the right place by a sheet of plastic tape. So I cut through the tape around the misfiring dome and removed it, cleaned it, and put it back. It seems to work fine now. I took pictures of the keyboard and the bottom latch: http://drop.io/HP38C_KeyRepair |