HP Forum Archive 08

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need help to open & fix my hp28s Message #1 Posted by EDWARD on 9 Apr 2002, 5:56 p.m. hi! guys, I have a HP28S from 1989, and never being clean on the keyborads, today i try to used it but the 4th row on the lefth keyboard did'nt work, how can i open it with out damaged on the calculator to clean and have it working back. please help me, thanks.

Re: need help to open & fix my hp28s Message #2 Posted by Vieira, Luiz C. (Brazil) on 10 Apr 2002, 9:10 a.m., in response to message #1 by EDWARD Hi (maybe I'm wrong, but... are you in Brazil?) Opening an HP28 is not something we hear about everyday. The old ones and some new ones are somewhat easier to open. The HP28 itself needs some mysterious procedures. I have one photo showing an opened HP28, but I am not sure it helps. One of the contributors in here have mentioned once his old HP28 was splited inside his son's backpack. I am not sure if he sent me the photos of the opened HP28, I'll check for it. If I find the photos and you want to, I'll send them so you can see where are the locking points. Best regards.

Re: need help to open & fix my hp28s Message #3 Posted by Johnny Bjoern Rasmussen on 10 Apr 2002, 11:15 a.m., in response to message #1 by EDWARD Take a look at http://www.hpcalc.org/hp48/docs/misc/hp28io.txt I haven't tried it out yet, but will do in a short time. I have a couple of HP-28S with defectives... Happy dismantling! Johnny

Re: need help to open & fix my hp28s Message #4 Posted by EDWARD IN MEXICO on 10 Apr 2002, 6:30 p.m., in response to message #3 by Johnny Bjoern Rasmussen JONNHY, THAK YOU VERY MUCH FOR THE SUGGESTED PAGE INFROMATION,IT WORK PERFECTLY, I STARTED ON THE LEFTH SIDE KEYBOARD, BUT WATH I FIND IS PROBABLY A LOSE OR BROKEN FLAT CABLE WICH CONECTS THE 3RD ROW TO THE CPU. I WILL TRY OPEND THE RIGHT SIDE TODAY LATER, IF I'M SUCCESFULL I WILL LET YOU KNOW, TO PUT IT BACK TOGETER I USE AN HOT SILICON GUN WITH FINE POINT. IT WORK OK. GRAT SITE. REGARDS

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