HP 32sII with faulty keypad



#2

Hi all!
I got a 32sII from a teacher, friend of mine 'cause useless and not working...."keep in your collection" he said!

I would like instead to give "her" back life....
It's the same problem I suppose I've read here through our forum archives, ...and the diagnosis matches!
but I would like to know please two things:

a) after I've opened (drilling the posts) and repaired how is better to close again the case?

b) had somebody success in repairing it just "handling" and squeezing the calculator?

...I had no great luck withe the zebras in the 41 ones!!

thank-you in advance

and cheers from Italy


Edited: 19 Sept 2012, 3:38 p.m.


#3

I have two 32sII calculators and they have both had this problem. One of them still does.

When the first one first started exhibiting the problem, I found that I was able to get it to work by "handling" the body - twisting and bending the entire calculator a bit. That would make it work for a few days at most.

Eventually I did take it apart (as described in the post). I found that a little bit of pressure on the circuit board would fix the problem. I never did remove the circuit board but instead I placed a makeup remover sponge (something like ) This ) over the board and put the cover back on. The sponge was about 5mm thick and a very dense highly compressible foam. It provided just enough even pressure on the circuit board to keep the calculator working. It has been more than a year now and it still works fine.

I just popped the calculator closed. Even though the posts had been drilled/snapped, there is still enough friction that it holds shut by itself. I originally intended to use it for a couple of months, see if it still worked and then glue the posts. However, it has never opened by itself, even with the extra resistance of the sponge I inserted, and so I see no reason to glue it.

The approach above did not work with my second calculator. Neither did the twisting and bending. So, I took the whole thing apart as described in the post. I was not however able to get the polyetheline tape specified (because of environmental laws it is not available in California and the companies I tried to order it from will not ship it here). I tried several substitutes but did not have good luck. The calculator is still in several pieces scattered on my desk.

#4

Like Marcel, my 32sII didn't need to be glued/fused back together at all after the repair. I just pressed the case halves back together and it has held fine for the last couple of years. Hope it goes well for ya.


#5

I opened the case, but actually did not succed to open it entirely, I got resistance in the bottom, so that I stopped the operation trying to understand the reason of this problem...

Actually also in the upper side, after the drilling job I succeded to open the two pieces not easily...I used a knife to detach the two surfaces and there are now even traces of this "intrusion" in the plastic soft body!
This evening I'll try to fix it without to completely open..I mean introducing aniway the plastic foam tokeep the PCB pressed on the the keyboard...

what do you think about, is it normal?

Edited: 20 Sept 2012, 7:17 a.m.


#6

There are four plastic stakes that hold the pieces together at the bottom of the calculator. The resistance you feel is normal. You either need to cut them with a skinny knife, or just snap them.




I snapped them apart, just by pulling hard. You can hear them snapping one at a time. When I did it, I did it sideways so that I wasn't trying to snap all the stakes at one time, but rather was snapping them one at a time.




Pictures


#7

Thank-you for sharing the pics and for the advices

Opened it....next destination a box, for me too, waiting for moreluck.....:)

I removed the PCB and after that dark night...
even after cleaning the contacts... in teh 41 posts, here the foam............ At the beginning it was "just" matter of point G search, now it's a whole defeat!
To get contact and just life on the display I've to twist, press, and............. I'm not able to describe my feelings

Edited: 20 Sept 2012, 5:18 p.m.


#8

Reassembled the calculator, after applying the double coated polyest. tape....the problem of the fourth - fifth coloumn of the keyboard is solved...but there is now a new problem the one I've created removing the PCB...the zebra connections are lost...............

EDIT:
Opened, cleaned again, removed the zebra, replaced after a new cleaning, replaced the PCB and forced bending with more straight the fixing labels (I was scared at the beginning to break them!)
WHOW, WHOW, WHOW it works!!!!!!!

I've performed a selftest and the result is:

KBD 01

then KBD 01-04
32SII-FAIL 8

where's the fault?

I found a post in the archives
this and actually I'm surprised reading that pioneers were made "not serviceable", If I well understood........


Edited: 22 Sept 2012, 10:12 a.m.


Possibly Related Threads...
Thread Author Replies Views Last Post
  Prime as laptop numeric keypad Jose Gonzalez Divasson 1 183 10-31-2013, 02:25 AM
Last Post: debrouxl
  HP 32sii Fault Carlos Estinos 9 437 09-26-2013, 01:06 PM
Last Post: Csaba Tizedes (Hungary)
  Faulty fullnut 41CV Paolo Cipollone 5 262 09-07-2012, 04:59 PM
Last Post: BobVA
  Faulty fullnut 41CV Paolo Cipollone 3 195 08-25-2012, 09:50 AM
Last Post: Luiz C. Vieira (Brazil)
  HP 32sII Integration Error of Standard Normal Curve Anthony (USA) 4 257 03-14-2012, 03:18 AM
Last Post: Nick_S
  HP48GX : faulty Port 2 ? any way to repair it ? Antoine M. Couëtte 4 272 01-13-2012, 10:56 PM
Last Post: Antoine M. Couëtte
  HP41CV faulty Steve Hunt 6 305 12-27-2011, 12:45 AM
Last Post: Kerem Kapkin (Silicon Valley, CA)
  HP-46 faulty keys - to Katie Juergen Keller 4 221 10-10-2011, 04:23 AM
Last Post: Juergen Keller
  Mapping HP-15C LE faulty keys Reth 5 283 10-04-2011, 07:55 AM
Last Post: Paul Gaster
  Find the hidden path game for HP-32sii Don Shepherd 0 148 09-27-2011, 09:46 PM
Last Post: Don Shepherd

Forum Jump: