DM-15, reset fault

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[DM16 V22] CHS gives unexpected results
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keithdalby
Posts: 564
Joined: Mon Apr 24, 2017 8:38 pm

DM-15, reset fault

Post by keithdalby »

When I press the RCL key, the bottom of the ENTER key, the 0 key or the . key, the calculator resets. This only started after I changed the battery. HAs anyone else observed this behaviour and what might I do to fix it?
sadsilence
Posts: 17
Joined: Thu Jun 15, 2017 7:50 am
Location: Germany

Re: DM-15, reset fault

Post by sadsilence »

4 keys in a row side by side. Seems to be a keyboard matrix problem. If it was right from the beginning I would guess a short cut on calculator's mainboard.
keithdalby
Posts: 564
Joined: Mon Apr 24, 2017 8:38 pm

Re: DM-15, reset fault

Post by keithdalby »

Took the back off, thinking maybe it was too tight and might be accidentally triggering the reset button, but the same behaviour happens intermittently with \Sigma+ and . even without the back on, carefully holding at the sides.

Ideas?
keithdalby
Posts: 564
Joined: Mon Apr 24, 2017 8:38 pm

Re: DM-15, reset fault

Post by keithdalby »

Video of the problem here: https://youtu.be/PChVVhJLD4M

Happens with the ENTER key too when in the housing.
Michael
Site Admin
Posts: 261
Joined: Wed Apr 05, 2017 11:31 pm

Re: DM-15, reset fault

Post by Michael »

On top of the battery holder there must be a foam pad, otherwise the positive pole makes contact with the housing, which is connected to the negative pole of the battery. Please check.
keithdalby
Posts: 564
Joined: Mon Apr 24, 2017 8:38 pm

Re: DM-15, reset fault

Post by keithdalby »

Michael wrote:
Wed Jul 05, 2017 11:07 am
On top of the battery holder there must be a foam pad, otherwise the positive pole makes contact with the housing, which is connected to the negative pole of the battery. Please check.
Hello Michael,

Yes, there is a foam pad on the battery holder
Michael
Site Admin
Posts: 261
Joined: Wed Apr 05, 2017 11:31 pm

Re: DM-15, reset fault

Post by Michael »

keithdalby wrote:
Wed Jul 05, 2017 1:29 pm
Hello Michael,
Yes, there is a foam pad on the battery holder
any chance the battery holder connects to the housing? Is it also possible without housing?
keithdalby
Posts: 564
Joined: Mon Apr 24, 2017 8:38 pm

Re: DM-15, reset fault

Post by keithdalby »

I don't think so, but I took the battery out to investigate further and since putting the battery back in I've not been able to reproduce the faulty behaviour. I don't know whether it was a software or a hardware issue, but it is resolved now anyway.

Thank you for your help.
keithdalby
Posts: 564
Joined: Mon Apr 24, 2017 8:38 pm

Re: DM-15, reset fault

Post by keithdalby »

Ah, started doing this again. I'll take a screwdriver to it later
keithdalby
Posts: 564
Joined: Mon Apr 24, 2017 8:38 pm

Re: DM-15, reset fault

Post by keithdalby »

Yep, battery had slipped. Might tape it in place next time, but easy fix.
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