HP Forum Archive 21

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Unknown battery pack Message #1 Posted by Nick R on 26 May 2012, 8:18 p.m. I've just aquired a Melcor SC-635 calculator that's missing its battery pack. Does anyone know what voltage the original pack would have been? The keyboard has a nice colour scheme now that I've removed a few decades of cigarette smoke residue.

Re: Unknown battery pack Message #2 Posted by Matt Agajanian on 26 May 2012, 9:13 p.m., in response to message #1 by Nick R Hi Nick. Have you seen this page: Tony's Taschenrechner-Sammlung Calculator-Collection Here's the link to the Melcor SC-635 from his site Melcor SC-635 I hope this helps Edited: 26 May 2012, 9:21 p.m.

Re: Unknown battery pack Message #3 Posted by Nick R on 26 May 2012, 10:26 p.m., in response to message #2 by Matt Agajanian Thanks for the link. I found it earlier but saw that he only refers to an external 9 volt charger and didn't open up the calculator to see what kind of battery pack it had. I suspect the pack voltage was much lower than 9 volts. I've run the calculator on 3 volts and it works after a fashion but keeps insisting that x/y = x^2. Perhaps the corrosion I discovered within has rotted its electronic brain.

Re: Unknown battery pack Message #4 Posted by Matt Agajanian on 27 May 2012, 12:25 a.m., in response to message #3 by Nick R I thought the link was worth a try. Hope you find a fully functioning one. Edited: 27 May 2012, 12:26 a.m.

Re: Unknown battery pack Message #5 Posted by Nick R on 27 May 2012, 1:32 a.m., in response to message #4 by Matt Agajanian Actually I don't mind that it gives wrong results. I just like the fact that it was made in the USA back when there was a thriving calculator industry. Besides, what do a few incorrect answers really matter if you're designing nuclear power plants or highway bridges...

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