HP Forums

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

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

(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

(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/

(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!

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

(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.

You should be able to see the images here.

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.

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/

(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

(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)