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HP 28S - how to open
07-24-2017, 10:20 AM
Post: #1
HP 28S - how to open
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
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07-24-2017, 09:03 PM
Post: #2
RE: HP 28S - how to open
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
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07-25-2017, 02:31 AM (This post was last modified: 07-25-2017 02:32 AM by Jlouis.)
Post: #3
RE: HP 28S - how to open
(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
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07-25-2017, 11:48 AM
Post: #4
RE: HP 28S - how to open
(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/
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07-25-2017, 05:24 PM
Post: #5
RE: HP 28S - how to open
(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!
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07-25-2017, 07:24 PM (This post was last modified: 07-25-2017 07:25 PM by striegel.)
Post: #6
Opening a clamshell HP calculator - done in 2011
This has been covered in the past with very detailed photos.
http://www.hpmuseum.org/cgi-sys/cgiwrap/...ead=185329
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07-29-2017, 10:24 AM (This post was last modified: 07-29-2017 10:27 AM by beerlim.)
Post: #7
RE: HP 28S - how to open
(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.
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07-29-2017, 10:41 AM
Post: #8
RE: HP 28S - how to open
You should be able to see the images here.
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08-31-2017, 04:01 AM
Post: #9
RE: HP 28S - how to open
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.
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11-28-2017, 11:11 AM
Post: #10
RE: HP 28S - how to open
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/
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11-29-2017, 04:34 PM
Post: #11
RE: HP 28S - how to open
(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
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11-29-2017, 07:45 PM
Post: #12
RE: HP 28S - how to open
(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)

Wikis are great, Contribute :)
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