buttons that don't register well

If you're having problems with the hardware of a DM42, post about them here.
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Walter
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Joined: Tue May 02, 2017 9:13 am
Location: Close to FRA, Germany

Re: buttons that don't register well

Post by Walter » Sun Jan 27, 2019 8:51 am

IMHO the truth is in between: issues concerning keyboard electromechanics are certainly not the rule, but the rate seems to be higher than what I'd call 'exceptions'. Exact figures may be known by SM, at least they should. As Lance (i.e. lkraven) wrote, some of these issues may be caused by small batch production techniques and methods applied but I don't know enough about them.

If the landscape model (DMxxL) keyboards really didn't show the issues reported for the DM42 (this must be verified, however) then this observation would be a first pointer to the root cause. Depending on the production flow and methods, each DM42 may contain up to 43 samples for testing hypotheses about the causes for those issues.
DM42 SN: 00041 --- Follower of Platon.

HP-35, HP-45, ..., HP-50, WP 34S, WP 31S, DM16L

fcrvincent
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Joined: Wed Dec 05, 2018 8:18 pm
Location: UK

Re: buttons that don't register well

Post by fcrvincent » Sun Jan 27, 2019 10:54 am

Keyboard issues on the DM1xL seem to be indeed less frequently reported but do occur still (plus I believe that only a few people report issues so what we see on the net is probably just the 'tip of the iceberg'). As recently as 11 Jan 2018 one Amazon (verified) reviewer of the DM15L said : "...The keys on the HP version have a great feel and doesn't need much press force. This calculator needs more force to push the keys... I found that if you press the keys too fast, the numbers won't register which leads to mistakes in my calculations. I have to slow down and recheck everything I do..."

The issue seems to be that the keys tactile response does not match with the domes clicks in some cases. Production variations could be an issue and I was thinking that the design of both the DM1xL and DM42 should be improved (easier said than done obviously!) to allow for larger tolerances at production.

For example may be the keys should bend more softly and/or the domes should be more flexible and may be the keys on the DM42 should be flat like on the DM1xL (they seem to be slightly slanted on the the DM42).

Not sure but the keyboard design is very similar to that of HP calculators I understood and there should only be small corrections for the DM1XL and DM42 to be perfect.

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H2X
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Location: Norway

Re: buttons that don't register well

Post by H2X » Sun Jan 27, 2019 3:06 pm

fcrvincent wrote:
Sun Jan 27, 2019 10:54 am
Keyboard issues on the DM1xL seem to be indeed less frequently reported but do occur still (plus I believe that only a few people report issues so what we see on the net is probably just the 'tip of the iceberg'). As recently as 11 Jan 2018 one Amazon (verified) reviewer of the DM15L said : "...The keys on the HP version have a great feel and doesn't need much press force. This calculator needs more force to push the keys... I found that if you press the keys too fast, the numbers won't register which leads to mistakes in my calculations. I have to slow down and recheck everything I do..."

The issue seems to be that the keys tactile response does not match with the domes clicks in some cases. Production variations could be an issue and I was thinking that the design of both the DM1xL and DM42 should be improved (easier said than done obviously!) to allow for larger tolerances at production.

For example may be the keys should bend more softly and/or the domes should be more flexible and may be the keys on the DM42 should be flat like on the DM1xL (they seem to be slightly slanted on the the DM42).

Not sure but the keyboard design is very similar to that of HP calculators I understood and there should only be small corrections for the DM1XL and DM42 to be perfect.
My DM42's keyboard is really very good now, after replacing the domes and bending the keys slightly back and forth as suggested somewhere on this forum.

My HP41CX and HP15C LE feel ever so slightly different, but I have no longer any complaints with my DM42.
DM42 SN:00040 | Without deviation from the norm, progress is not possible - Frank Zappa

fcrvincent
Posts: 10
Joined: Wed Dec 05, 2018 8:18 pm
Location: UK

Re: buttons that don't register well

Post by fcrvincent » Sun Jan 27, 2019 9:02 pm

Another reviewer on Amazon had the keyboard issue (20 Jan 2019): "20 January 2019 - Published on Amazon.com Verified Purchase. "..I too had some keyboard issues. Michael at Swiss Micros helped me out. It took some time and some patience.."

The keyboard issue, at least on the DM42, seems to be endemic and for now and although it is a very nice device I probably won't risk it. Also one can wonder if those keyboard fixes proposed will be as durable as the rest of the hardware seems to be.

I may try the DM15L that seems less prone to this issue.

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