Restoring a HP9830B calculator.

[MattisLind]

(04-25-2014 06:23 PM)waterlander2004 Wrote:  Hi Mattis,

Good to see another 9830 enthusiast!

I do happen to have a couple of extra keycaps. At least I have a 'delete line' and a '5' key cap. I assume you need the '5' that belongs in the numeric block, correct? Just send me a mail with your details.

With respect to technical info, you'll find an excellent source in the 98xx repair guides written by Tony Duell, published in the HPCC DataFile. If you're not yet a member, these guides alone would make it worth becoming one.

Keep us posted with your restoration progress!

Kind regards, Eric

Hi Eric!

The five is the "5 %" key, not the numeric block. But I did find someone at Ebay selling key tops from what I presume is the keyboard of a HP 2648 which AFAIK is pretty much the same . I bought them... That included the "5 %" key top. But the END and DELETE LINE keys are obviously not in that set. But now I have a set of other key tops if any one needs!

I send you a PM regarding the "DELETE LINE".

Tony Duell Wrote:The Cherry switches were a standard part, in that I found an non-HP keyboard that used them. I have a few (very few) spares somewhere, hopefully they will turn up sometime...

I searched google (and ebay) high and low trying to figure out what kind of model this is but didn't found anything.

Tony Duell Wrote:As regards getting the machine going, in my experience power supply problems are uncommon, and I've yet to replace a capacitor in the PSU of any HP9800 machine. But logic problems are common. Most of the time the display is totally blank and the fault is somewhere in the CPU/memory control section. A logic analyser is very useful.

Good luck with the HP9880 disk system. This is going to be one of my next projects, I have all the bits of one now...

Good to know about the PS. I do have a logic analyser. Only 32 channels though.
I'll have a look in the repair files. It will probably be quite a while until I start looking at the disk sub system.

I'll update the thread when there are progress (or problems are arising...)