9810 Repair Situation



#2

I have four HP 9810 desktop calculators.

Status:
1) One works
2) One starts up; lights keyboard lights; then changes the lights.
3) Two just come up with a fixed static keyboard lights.

None of the 3 that are not functioning, ever turn on the LED display. All have all cards and good voltages.

Here is my plan and I'm wondering if any damage is likely to occur to my good boards. I'd like to hear from anyone who has ever repaired any of these. Ordinarily, I would not worry about swapping boards but since many of these have problem, I'm worried that there might be some real issue with the 9810 and board swapping.

Plan:
I will remove 1 board at a time from all of the non-working machines and install them in the working 9810. That should identify which boards are bad.

Then, I will, if possible combine as many working sets as possible, to get at lease one other working 9810. I will likely offer the remaining non-working units as spare parts to anyone else who may need them. However no spares will given out until I have maximized the number of working units I can restore.

Also, these came from a 220V environment. It may be that these had 220 applied while the setting was at 120. Just a guess. Have no reason to believe this was the case, one way or the other. I did check the voltages at the top of the power supply and they are correct.

I also have about 75 magnetic cards for these. If anyone is completely without cards, I might make a few available, at no charge, just for the purpose of testing your reader.

Thanks,

Mike


Possibly Related Threads...
Thread Author Replies Views Last Post
  wp34s, another shutdown situation Andrew Nikitin 10 2,237 06-19-2013, 01:52 AM
Last Post: Paul Dale
  Removing 9810 printer snap rings (circlips) David Ramsey 5 1,248 09-06-2011, 01:32 PM
Last Post: David Ramsey
  Which cold shrink kit for 9810 printer platen? David Ramsey 1 711 07-19-2011, 04:06 AM
Last Post: Tony Duell
  9810 works, briefly David Ramsey 37 6,404 07-11-2011, 04:11 AM
Last Post: Tony Duell
  9810 on TAS David Ramsey 25 4,184 06-30-2011, 04:16 AM
Last Post: Tony Duell
  9810 restoration - my report marais 5 1,227 08-01-2005, 02:47 AM
Last Post: marais
  9810 service manual marais 37 5,673 01-03-2005, 02:14 AM
Last Post: Marc
  9810 David Ramsey 7 1,177 08-20-2004, 02:27 PM
Last Post: Tony Duell
  33S situation is getting ugly... CME750 19 2,909 11-18-2003, 12:45 PM
Last Post: CME750
  HP49G repairs---what's the situation? Mark Ordal 10 1,855 09-17-2003, 04:45 AM
Last Post: Ellis Easley

Forum Jump: