Dead key on 35s

[Jeff O.]

(03-17-2016 06:17 AM)Tugdual Wrote:  

(03-16-2016 08:17 PM)Marcio Wrote:  Tugdual,

Did you fix the bad key on the 35s?

Nope, I think Maximilian made a point and also Jebem kinda discouraged me from attempting anything. If it was a simple thing such as open, clean I would have tried but breaking plastic rivets to fix pins is above my available time/skills.

You must certainly be the judge of what you are comfortable doing, but I would not be too scared by the prospect of removing the plastic rivets. They are not that difficult to deal with, and there are screws that will hold things together without the rivets. Paraphrasing from a post of mine at the old Forum regarding disassembly of a 35s:

Quote:It certainly appeared that the PCB was held in by those small screws (25 of them), so I removed them all. Gentle prying on the edges of the PCB did not yield any movement. Close inspection revealed that the posts into which the screws were screwed were mushroomed over at the top, just like the heat stakes in other HP calculators. Taking a cue from the tips for disassembling those calculators, I attempted to trim off just the mushroomed-over portions of the posts, i.e. leave the center part of the post sticking through. I was unable to trim them cleanly enough to free up the PCB, so I just trimmed the posts off flush with PCB, and with a little gently prying, was finally able to free up the PCB. (I then realized that this was likely to be necessary anyway to enable the screws to hold the PCB back in when it is re-installed. Otherwise, the screws would not be able to tighten down against the board to hold it firmly in place.) Once the PCB comes out, next is a thin rubber membrane, then the keys themselves.

There is an adhesive sheet of plastic on the keyboard side of the PCB, under which are the metal domes that are the key contacts. If your problem is contamination under one of the contacts, you must peel that sheet off to clean. I have no experience peeling off or re-attaching that sheet.