HP Forum Archive 06

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HP-9810A needs repair Message #1 Posted by Thomas Schmeidl on 5 July 2001, 7:12 a.m. Recently, I found an HP-9810A in overall good shape. It is quite dusty, but works OK, as far as I can tell. However, on the top LED row (the z-line), one segment of each LED (it's the bottom left segment) is not functioning. Since it's the same segment on each LED I guess some driver transistor is dead. Could anybody please point out how to repair this? Or how to find out what really is wrong? Thank you very much.

This file is your friend (50MD dl) - Re: HP-9810A needs repair Message #2 Posted by Reinhard Hawel on 5 July 2001, 10:58 a.m., in response to message #1 by Thomas Schmeidl http://www.hawel.net/hp9810a.pdf Sorry, no ftp server. The patent number is 3.859.635 and the title is simply "Programmable Calculator". The document is 411 pages long and includes schematics, hardware description and ROM listings - enough to build yourself a 9810A. Some versions of Netscape seem to have problems with such large files, so I'd recommend the Internet Explorer in this case (I prefer Netscape normally ... ) . My connection should be fast enough (T3, T4, T5, T6 ??? - anyway, it should be no problem, it's the University connect BTW: I'd like to know, how long the transfer took.

Re: This file is your friend (50MD dl) - Re: HP-9810A needs repair Message #3 Posted by Raymond Hellstern on 5 July 2001, 6:15 p.m., in response to message #2 by Reinhard Hawel Hi Reinhard, I got a non-working 9810A recently, so this document could be of interest for me, too;-) I downloaded it in about 12 minutes, thanks to DSL:-))) Raymond

Re: This file is your friend (50MD dl) - Re: HP-9810A needs repair Message #4 Posted by Thomas Schmeidl on 5 July 2001, 6:40 p.m., in response to message #2 by Reinhard Hawel Hi Reinhard, Thank you for your help. Downloading the file took al little less than 20 minutes (512Kbit DSL). I guess printing and understanding will take a little longer. Anyway, I'll let you know how I did... Regards, Thomas

Re: HP-9810A needs repair Message #5 Posted by Steve (Australia) on 6 July 2001, 6:52 p.m., in response to message #1 by Thomas Schmeidl It will take me about 3 days (28.8 dialup -- bad lines) so... I'll get started now.

Re: HP-9810A needs repair Message #6 Posted by Raymond Hellstern on 6 July 2001, 8:21 p.m., in response to message #5 by Steve (Australia) Maybe it'll be cheaper sending the manual on CD... Raymond

Re: HP-9810A needs repair Message #7 Posted by Reinhard Hawel (Austria) on 8 July 2001, 4:15 p.m., in response to message #5 by Steve (Australia) Hi Steve If you didn't get it til now, I can send you the file on CD free of charge. Just email me your address. Reinhard

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