DM 15L keypress problems

[BarryMead]

(02-01-2016 09:01 PM)PANAMATIK Wrote:  I also loose randomly keys when pressing them normally, DM-15L S/N#00402. Some keys (especially in the first row) have a severe mechanical double klick feeling, they have a first and a second point of mechanical resistance, which makes them displeasing to use. Unfortunately it cannot be my everyday calculator for this reason. My respect though for having made this HP clone.
Bernhard

Bernard: I used to have a problem with the #2 button on my DM-15L, (it required much more pressure to register than all of the other keys). When I reported this issue, Michael asked me to peal back the sticky tape to see if that key had a "Double Dome" under it. In my case pealing back the tape and re-attaching it fixed the issue (apparently some debris was caught under the dome making it necessary to apply more force to make good contact). When I pealed back the tape, and reattached it, the debris fell out and the key now works just like all of the others. When you mentioned the double click action on your top row keys, I immediately flashed back to this "Double Dome" diagnosis that Michael warned me about. Perhaps it would be worth a peek under the tape to see if you have "Double" metal domes under some of the top-row keys. Hope this helps, Barry