Repair the hp 20s

[joshua Lee]

Dear All,
My hp20s is out of order,but it want repair it.I can't see any screw in the back cover. Can you tell me how to disassemble it.
Thx
joshua

[Karl Schneider]

Joshua --

These Pioneer-series calculators are not really desgned to be repaired, but it can be done. Here are several contributions from the Articles Forum on this website:

http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=5

http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=451

I should mention that, even after being discontinued in 2002, the HP-20S is still plentiful and readily-available from eBay and other sources, for a reasonable price.

-- KS

[joshua Lee]

Dear Karl Schneider,
Thank for your reply.
Thx
joshua

[Ron Ross]

And if you find it not repairable, the Hp33s algebraic mode is AOS just like the Hp20s. Therefore the Hp33s is the closest direct replacement for the older Hp20s also.

[joshua]

Thank you for your replay, I don't like the hp's style of current model . I like the old model such as hp22s , hp20s , hp 12c , hp15c. I prefer repair my hp20s .

[John Smitherman]

Quote:

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Thank you for your replay, I don't like the hp's style of current model . I like the old model such as hp22s , hp20s , hp 12c , hp15c. I prefer repair my hp20s .

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Hi, Joshua. Here's a like to a calculator dealer that is advertising new 20s' for sale:

http://www.usedcalculators.com/hpmain.php

Regards,

John

[joshua]

Dear John,
Thank you for your information. I also buy a new one form e-bay.You also reach in here.It is come from HPCalculatorscom.The price is about US$50 + shipping(US$25 to Hong Kong ),but I don't known that the shipping is very expensive just for USPS Airmail.
Thx