HP Forum Archive 16

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O-Rings for HP-67 repair Message #1 Posted by Dirk Schneemann on 30 Mar 2006, 6:33 a.m. Hi all! My computer science teacher is crazy about his old HP-67 calculator. Unfortunately, the card reader doesn't work anymore... this seems to be quite normal after some time, as I read in some articles on this calculator. He told us several times that he failed to find any fitting spare parts to repair his model. This is our last year with him and we decided to help him repairing his beloved HP-67, to say goodbye. A classmate of mine found this method on the internet to repair the cardreader, using two so called "O-Rings"... I've never heard of these. The article (Look at step 7) Do you folks have any idea, where I can get these O-Rings from? I'm very thankful for any hints :-) Greetings

Re: O-Rings for HP-67 repair Message #2 Posted by Walter B on 30 Mar 2006, 7:05 a.m., in response to message #1 by Dirk Schneemann Hallo Dirk, passendes Material gibt's bei ebay von verschiedenen Anbietern. Schick' mir ggf. Deine Mailadresse für eine Quellenangabe. O-Ringe sind torusförmige Dichtungsringe aus "besserem Gummi", braucht man u.a. in der Vakuumtechnik. MfG (this stuff is available at ebay from various sellers. O-rings are toroidal sealing rings made of "high quality rubber", needed e.g. in vacuum technology. (free translation for our multilingual readership))

Re: O-Rings for HP-67 repair Message #3 Posted by jbssm on 30 Mar 2006, 7:37 a.m., in response to message #1 by Dirk Schneemann Hi there, if the problem is only mechanical (this is, if the problem of the card reader is only because of the gummy wheel), then the O-Rings will do OK. The back label will always be a somewhat defective after the process, but if you follow the instructions in the document you pointed, then you should be able to get the card reader to work again with some effort. There is also the option of sending it for repairs, I believe that there are some people available in the USA that do it. Regards, jbssm

Re: O-Rings for HP-67 repair Message #4 Posted by Daniel B. on 30 Mar 2006, 8:22 a.m., in response to message #3 by jbssm Hallo Walter, gut, dass es hier noch andere deutschsprachige Leser gibt ;). Ich bin der eingangs erwähnte "classmate" und leider habe ich bei Ebay nichts brauchbares für den Rechner gefunden (Suchwort HP-67). In den USA wollte das einer für 55$ reparieren, jedoch kämen dann auch noch ~30$ Versand dazu, das ist in unseren Augen doch etwas teuer. Es wäre nett, wenn du uns sagen würdest, wo es sowas hier in Deutschland gibt. Ich habe vorhin auch einen weiteren User aus diesem Forum hier angeschrieben, der einem anderen eine Reparatur angeboten hat (auch der war Deutsch). Das würde eben die Kosten für Versand, Überweisung etc niedriger halten. Danke für die schnellen Antworten! (Walter was right, we are german and i'm the classmate ;) it would be better for us to find a german repairer or german spare parts because of the shipping and transfer costs)

Re: O-Rings for HP-67 repair Message #5 Posted by Maximilian Hohmann on 30 Mar 2006, 8:57 a.m., in response to message #4 by Daniel B. Hallo! Ich bin zwar nicht Walter, aber ich weiss, wo man kleine O-Ringe bekommt :-) Bei Conrad-Electronic (www.conrad.de) gibt es Artikel-Nr.: 821152 - 62 , ein O-Ring-Sortiment für ca. 10 Euro. Das hat mir über die Jahre schon viele gute Dienste geleistet, von der Pressluftflasche über die Fernrohrmontierung bis zum Wasserhahn... und natürlich die Kartenleser! Grüße, Maximilian English: My name isnt Walter, but I do know where to (easily!) get these O-Rings in Germany: Conrad-Electronic sells a large assortment of O-Rings for about 10 Euros. I have found numerous uses for these over the years: From scuba-diving tanks over telescope mounts to water faucets ... and of course card readers!

Re: O-Rings for HP-67 repair Message #6 Posted by Daniel B. on 30 Mar 2006, 9:57 a.m., in response to message #5 by Maximilian Hohmann Oha, das klingt sehr interessant, danke für den Tipp! Und bei der Montage geht man dann einfach so vor wie bei der PDF-Anleitung, nur nimmt man an Stelle des Silikons einfach einen von den Ringen und macht ihn über das kleine Rädchen? Das Problem ist aber auch, dass wir ja nicht genau wissen, was defekt ist (nur aus seinen Erzählungen) und daher könnte ja auch noch mehr kaputt sein. Darum wäre eine fachkundige Person am besten, die sich den ganzen Rechner mal anschauen könnte und den Card Reader wieder komplett in Stand setzt, so dass auch alles wieder geht. (wir würden dann wohl einen Gutschein schenken oder so) Und aus genau diesem Grund wäre es ideal, wenn sich hier jemand netterweise bereiterklären würde, das zu übernehmen ;). Ist eben einfach sicherer, als nur einen Ring zu kaufen, an dem es dann möglicherweise gar nicht lag (außerdem wissen wir ja auch gar nicht, ob unser Lehrer das alleine hinkriegen würde). Mfg (sry guys, but i'm too lazy to translate it ;))

Re: O-Rings for HP-67 repair Message #7 Posted by Etienne Victoria on 30 Mar 2006, 10:46 a.m., in response to message #6 by Daniel B. Die Montage ist nicht so schwer wenn man den PDF-Anleitung folgt und wenn nur eine Gummi Rolle Problem gibt. Aber wenn Sie eine fachkundige Person suchen ist es sicherer den ganzen Rechner nach Randy zu senden. Jedoch ist er in den Vereinigten Staaten. Hier findet man seinen Unternehmen: Randy's MfG aus Frankreich ----------------------------------------------------- Translation: Randy is one of the best for this kind of job.

Re: O-Rings for HP-67 repair Message #8 Posted by bill platt on 5 Apr 2006, 4:03 p.m., in response to message #7 by Etienne Victoria Quote: Gummi Rolle Problem Sometimes German just makes me smile. :-) Edited: 5 Apr 2006, 4:03 p.m.

Re: O-Rings for HP-67 repair Message #9 Posted by Dirk S. on 30 Mar 2006, 10:54 a.m., in response to message #6 by Daniel B. Hallo! Danke soweit für die vielen Antworten! Ein freundlicher Mensch hat mich bereits angeschrieben und mir angeboten, zwei O-Ringe zu schicken. Ich weiß nicht, ob er hier auch selbst schreibt, daher verrate ich den Namen mal lieber nicht ;-) Das ist natürlich klasse. Und selbst wenn das nicht klappt, Conrad Elektronik haben wir hier zwei mal in erreichbarer Entfernung. Wie Daniel B. bereits sagte, wäre es natürlich am besten, wenn es auch hier in Deutschland jemanden gäbe, der den Rechner fachkundig reparieren könnte. Kennt Ihr da jemanden oder Adressen? Ansonsten werden wir wohl auf die Sache mit den O-Ringen zurückkommen. Grüße Dirk English: A friendly fellow already wrote me, offering to send me two O-rings. Since I don't know if he is actively involved in this discussion, I won't specify his name right here ;-) Certainly, this is fantastic! And even if this won't work out, we've got two "Conrad Elektronik" shops not far away from us. As Daniel B. already said, the best solution would be if there was somebody in Germany who could competently repair the calculator for us. Does anybody of you know such an expert or adresses where we might find one? Otherwise, we will get back to the O-rings. Greetings Dirk

Re: O-Rings for HP-67 repair Message #10 Posted by Klaus on 31 Mar 2006, 1:30 a.m., in response to message #9 by Dirk S. I live near Frankfurt, and I can repair your 67 for free. Marcus v C. and myself have already repaired our HP-41 Card readers, and I have repaired a few HP-67As. If you want to do the repair yourself, note that you also might have to change capacitors (Deutsch: Kondensator). I also have made schematics (drawn by hand on paper, but I can offer scans) of my HP-67 with capacitor-values, polarity and connections. Good luck! Klaus

Re: O-Rings for HP-67 repair Message #11 Posted by Daniel B. on 31 Mar 2006, 8:30 a.m., in response to message #10 by Klaus Hallo Klaus, es wäre nett, wenn du mir deine Emailadresse mitteilen würdest (gerne auch per Mail, um Spam zu vermeiden), damit wir noch ein paar Sachen besprechen können. (I asked Klaus to contact me for further information)

Re: O-Rings for HP-67 repair Message #12 Posted by Klaus on 31 Mar 2006, 8:50 a.m., in response to message #11 by Daniel B. My email is khi_1981@web.de Bitte den Unterstrich aus der Adresse entfernen!

Re: O-Rings for HP-67 repair Message #13 Posted by Klaus on 4 Apr 2006, 2:36 a.m., in response to message #12 by Klaus You can also contact me by clicking on my name in the title of this message. Since I have a spam-filter, sometimes some messages get lost.

Re: O-Rings for HP-67 repair Message #14 Posted by David Smith on 31 Mar 2006, 11:54 a.m., in response to message #1 by Dirk Schneemann I do not recommend o-rings. I use the silicone rubber model airplane fuel line. If you MUST use o-rings, you need size 005 (15/64" outside diameter). The much more common 006 (1/4") will cause the reader to bind.

Re: O-Rings for HP-67 repair Message #15 Posted by Walter B on 4 Apr 2006, 4:54 p.m., in response to message #14 by David Smith AFAIK, these "sizes" or fractions don't mean anything outside the USA. For the rest of the world, you will need an O-Ring with 6.0 mm outside diameter.

Re: O-Rings for HP-67 repair Message #16 Posted by Maximilian Hohmann on 5 Apr 2006, 9:24 a.m., in response to message #15 by Walter B Hello! Quote: AFAIK, these "sizes" or fractions don't mean anything outside the USA. Funny: Apart from calculators, I also collect ViewMaster reels. A few days ago, I watched a series called "Measure with Metrics" from the 70ies or early 80ies ... it seems that it didn't have much impact :-) Greetings, max

Re: O-Rings for HP-67 repair Message #17 Posted by Dave Shaffer on 5 Apr 2006, 11:44 a.m., in response to message #16 by Maximilian Hohmann re: "A few days ago, I watched a series called "Measure with Metrics" from the 70ies or early 80ies ... it seems that it didn't have much impact :-)" As the story over here goes, there were US Congressmen who responded to the metric system with quotes like "If it was good enough for my grandpa, it's good enough for me." Apparently, there hasn't been enough turnover of grandparents yet!

Metric System Message #18 Posted by Maximilian Hohmann on 5 Apr 2006, 3:54 p.m., in response to message #17 by Dave Shaffer Hi! Quote: Apparently, there hasn't been enough turnover of grandparents yet! Well, maybe thats not so bad after all: As it is, we have at least one genuine use for our calculators: Converting units :-) Greetings, Max Regarding England: They (at least their aerospace industry) surrendered to the metric system when they decided to develop and build Concorde in 1963 (and many more multi-national projects thereafter).

Re: Metric System Message #19 Posted by bill platt on 5 Apr 2006, 4:11 p.m., in response to message #18 by Maximilian Hohmann My favorite factoid about american metric is that during the Carter administration, when Metric was being actively pushed from the top down, the federal highway administration converted over. Then Reagan came in and encouraged the undoing of the conversion (and congress happily complied) but the highway guys balked. They would not go back. And so to this day, federal roads are designed and documented in metric, but of course converted for the road building crews. My second favorite factoid is that some of the ISO metric standards were actually developed from ANSI (that's American National Standards Insitiute) standards! My third factoid is that a number of toolmakers in Rhode Island and Connecticut exported significant numbers of metric tools to the European market before WWII. My father saw these tools in factories when he was in Europe in the mid 1940's. Edited: 5 Apr 2006, 4:12 p.m.

Re: O-Rings for HP-67 repair Message #20 Posted by David Smith on 5 Apr 2006, 10:11 a.m., in response to message #15 by Walter B There's a "rest of the world"? Wow, who knew ;) What will They think of next! They do sell o-rings via numeric designation in some place called "England" (at least).

Re: O-Rings for HP-67 repair Message #21 Posted by bill platt on 5 Apr 2006, 4:13 p.m., in response to message #20 by David Smith Yeah, what's with that? I thought china was a kind of pottery.

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