buttons that don't register well

If you're having problems with the hardware of a DM42, post about them here.
Dave Britten
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Re: buttons that don't register well

Post by Dave Britten » Sun Jul 08, 2018 12:14 pm

It feels about the same as the rest of the keyboard, but given that there's still some slight variability among the keys (my Rdown requires more force than TAN, for example), it's difficult to say on which side of the mean Enter now lies. It feels a hell of a lot better than when I got it, though.

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Re: buttons that don't register well

Post by H2X » Wed Aug 29, 2018 9:14 pm

I think my issue with the keyboard just went away!

I got a new sheet of slightly larger (and softer?) domes from Switzerland. I had to improvise on the installation procedure, but I got them perfectly aligned (and I can see how that might have been difficult using the procedure for the Voyager models).

That, combined with gently pressing the keys before closing up, seems to have done the trick. Now I have a totally enjoyable experience calculating all and sundry!

Thanks, Michael!
DM42 SN:00040
Be enter not or (Hamlet Yoda not)

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Re: buttons that don't register well

Post by xmehq » Fri Sep 28, 2018 1:29 pm

The shift key on my DM 42, sn 03805, has always been tricky to use, it seems to register about half the time. This morning I noticed that there is a slight gap between the upper and lower parts of the case in the corner nearest the shift and exit keys. I opened the case to see if something was misaligned but found nothing amiss. I carefully aligned the slots and tabs and reattached the back and the gap is still there. Is seems like the keyboard bezel may be slightly warped. Any suggestions on what I might try next?

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Re: buttons that don't register well

Post by ijabbott » Wed Nov 14, 2018 5:37 pm

I just opened up my calculator to try cesar's Post-It note (or supermarket own-brand sticky notes in my case) trick to fix the non-clickyness of the left hand side of the ENTER and it worked great! The ENTER key on my DM42 now feels the same all across its width.

I also followed Logan's procedure to flex all the keys while I was at it. (I've done it before, but I thought a little more couldn't hurt.) Some of the top edges of the keys rubbed got caught against the holes in the keyboard escutcheon while I was doing this due to some minuscule misalignment, but it doesn't happen for normal operation of the keys.

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Re: buttons that don't register well

Post by gduncan » Sat Dec 15, 2018 3:16 pm

• 2 Post-It strips centered on the left enter dome
• Gently flex keys

These mods worked very well for me.

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Re: buttons that don't register well

Post by vjsilva » Fri Dec 28, 2018 12:02 am


Just received my new DM42 3 days ago and on the first day of use discovered that many keys don't register after the tactile feedback (click). Some require considerably more pressure to register, others require only slight pressure and yet others work as expected (i.e. register after the click).

This is unacceptable for a new unit and I certainly am not going to open this up and fidget with screws to get it right. If this is suppose to be carrying on the HP tradition, I have a number of old HP calculators and none have ever operated like this.


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Re: buttons that don't register well

Post by Michael » Fri Dec 28, 2018 12:08 am

Hello Victor, I'm sorry for that.
Please send me an email to sort things out.

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