HP Forum Archive 15

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9810 restoration - my report Message #1 Posted by marais on 19 July 2005, 6:19 p.m. ...for those of you who remember the discussion about my dead 9810 in late december last year, I am glad to report that the machine now works again, at least partially. There is still some work to do on the printer and tape drive units, as well as on the power supply, but the calculator itself works flawlessly. I wrote a report on the repair hoping that it might be helpful to revive other 9810s: 9810 repair job It's a fascinating machine, and I learned a lot about its architecture. Long live the 9810! Andreas

Re: 9810 restoration - my report Message #2 Posted by Vassilis Prevelakis on 20 July 2005, 1:57 a.m., in response to message #1 by marais Congratulations, very nice page. I also checked your HP 97 repair page, but since my German is prety weak, I didn't make much out of it. How about translating that one as well? **vp

Re: 9810 restoration - my report Message #3 Posted by Tony Duell on 20 July 2005, 3:36 p.m., in response to message #1 by marais When you want to sort out the printer or card reader, feel free to contact me. I've taken both sections _totally_ apart, and can explain how they should work and how to repair them.

Re: 9810 restoration - my report Message #4 Posted by marais on 21 July 2005, 3:50 a.m., in response to message #3 by Tony Duell Thank you Tony. I will soon replace the faulty 74107 in the printer, and frankly expect it to work right after that - the print head looks like new, as does the motor. The card reader however seems to require more work. I think I'll make it my christmas holiday project.

Re: 9810 restoration - my report Message #5 Posted by don wallace on 1 Aug 2005, 2:31 a.m., in response to message #4 by marais Hi Marias, (Guten Tag!) Had a look at your 9810 page; really cool! I am wondering if you also have a failed driver transistor on the output side of the 74107 motor "state machine" logic? Just a thought. Kind regards from Down Under! Don W

Re: 9810 restoration - my report Message #6 Posted by marais on 1 Aug 2005, 2:47 a.m., in response to message #5 by don wallace Don, that's quite likely, but these don't worry me, as I got plenty of transistors in my spare parts box. As soon as I found out that the 107 FF was dead, I did not bother to look any further. Maybe I'm in for a surprise when I replace the 107 - I'll keep reporting. Thank you for your suggestion! Andreas

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