HP Forum Archive 20

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Message to Katie Wasserman: thanks! Message #1 Posted by Ignazio Cara (Italy) on 19 Dec 2011, 11:32 a.m. Through the valuable article by Katie I was able to resurrect an HP-27. Thanks to a small resistor 32 kOhm, this little beauty can fully be together with other woodstock in the collection of an avid collector. Many thanks again and regards from Italy. Ignazio

Re: Message to Katie Wasserman: thanks! Message #2 Posted by hpnut on 19 Dec 2011, 12:12 p.m., in response to message #1 by Ignazio Cara (Italy) Please share with us Katie's work.

Re: Message to Katie Wasserman: thanks! Message #3 Posted by Ignazio Cara (Italy) on 20 Dec 2011, 5:04 a.m., in response to message #2 by hpnut Of course, hpnut. I was trying to repair the hp-27 of my dear friend. No display but good tensions from the DC-DC inverter and a current drain of 110 mA. How you can read in the article of Katie about the issues of Woodstock's series calculator, I have cut the SYNC trace from the ACT to the rest of the calculator and insert one resistor (32KOhm, 1/4W, 5%) that has resurrected the little beauty, so far. My first attempt has been with a 20 KOhm resistor but with value of resistor the 27 needed 3 or 4 minuts to warm up properly. It's all, I'll be available for any further information. Regards from Italy. Ignazio

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