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beerlim · 07-24-2017, 10:20 AM

I have a 28S and the 2nd bottom row on both sides of the calculator are not working.
How would I go about opening the calculator? I can not find it on youtube either.

Thanks

Philippe · 07-24-2017, 09:03 PM

Hi,

A french book "Voyage au centre de la HP 28c/s" written by Lalande and Courbis explain the procedure. This great book can be downloaded here :

http://www.courbis.fr/Voyage-au-centre-d...-s,17.html

It's free but you can make a donation.

Have fun,
Philippe

Jlouis · (This post was last modified: 07-25-2017 02:32 AM by Jlouis.)

(07-24-2017 10:20 AM)beerlim Wrote: I have a 28S and the 2nd bottom row on both sides of the calculator are not working.
How would I go about opening the calculator? I can not find it on youtube either.

Thanks

Try this here

Good luck

beerlim · 07-25-2017, 11:48 AM

(07-25-2017 02:31 AM)Jlouis Wrote:
(07-24-2017 10:20 AM)beerlim Wrote: I have a 28S and the 2nd bottom row on both sides of the calculator are not working.
How would I go about opening the calculator? I can not find it on youtube either.

Thanks

Try this here

Good luck

Well I went ahead and started to document it.
http://www.teawea.com/how-to-open-a-hp-28s-calculator/

Jlouis · 07-25-2017, 05:24 PM

(07-25-2017 11:48 AM)beerlim Wrote:
(07-25-2017 02:31 AM)Jlouis Wrote: Try this here

Good luck

Well I went ahead and started to document it.
http://www.teawea.com/how-to-open-a-hp-28s-calculator/

Fantastic job! Really thanks for This!

striegel · (This post was last modified: 07-25-2017 07:25 PM by striegel.)

This has been covered in the past with very detailed photos.
http://www.hpmuseum.org/cgi-sys/cgiwrap/...ead=185329

beerlim · (This post was last modified: 07-29-2017 10:27 AM by beerlim.)

(07-25-2017 07:24 PM)striegel Wrote: This has been covered in the past with very detailed photos.
http://www.hpmuseum.org/cgi-sys/cgiwrap/...ead=185329

How do I get the images to work? They do not show up for me, that is why I started to document my own.
http://www.teawea.com/how-to-open-a-hp-28s-calculator/
To go a step further: My goal would be create a new case.

Didier Lachieze · 07-29-2017, 10:41 AM

You should be able to see the images here.

beerlim · 08-31-2017, 04:01 AM

I finished documenting the opening of the HP28S. Same URL as before
Then I cleaned the contacts and put it back together just to see if it worked.
I could not believe it, it really worked.
So my next step will be to create a new case to transfer everything from the old "destroyed" one to the new. Will see how that goes.

beerlim · 11-28-2017, 11:11 AM

Well the next step is planed by creating a new case for the HP-28
We are half way there
https://www.teawea.com/category/tech-games/hp-28s/

SlideRule · 11-29-2017, 04:34 PM

(11-28-2017 11:11 AM)beerlim Wrote: … the next step is planed by creating a new case for the HP-28…

Just a suggestion, but wouldn't the Door-in-Back version of the battery compartment {as deployed on the final HP-19BII model} have enhanced longevity/utility over the Door-on-Side version?

BEST!
SlideRule

pier4r · 11-29-2017, 07:45 PM

(11-28-2017 11:11 AM)beerlim Wrote: Well the next step is planed by creating a new case for the HP-28
We are half way there
https://www.teawea.com/category/tech-games/hp-28s/

Have you considered the wiki4hp as well? When I can I'll add your site as link (see my sign)