DM-15, reset fault

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[DM16 V22] CHS gives unexpected results
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keithdalby
Posts: 545
Joined: Mon Apr 24, 2017 6:38 pm

DM-15, reset fault

Post by keithdalby » Tue Jul 04, 2017 5:12 pm

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: 14
Joined: Thu Jun 15, 2017 5:50 am
Location: Germany

Re: DM-15, reset fault

Post by sadsilence » Tue Jul 04, 2017 7:42 pm

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: 545
Joined: Mon Apr 24, 2017 6:38 pm

Re: DM-15, reset fault

Post by keithdalby » Wed Jul 05, 2017 8:39 am

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: 545
Joined: Mon Apr 24, 2017 6:38 pm

Re: DM-15, reset fault

Post by keithdalby » Wed Jul 05, 2017 8:46 am

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

Happens with the ENTER key too when in the housing.

Michael
Site Admin
Posts: 236
Joined: Wed Apr 05, 2017 9:31 pm

Re: DM-15, reset fault

Post by Michael » Wed Jul 05, 2017 9:07 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.

keithdalby
Posts: 545
Joined: Mon Apr 24, 2017 6:38 pm

Re: DM-15, reset fault

Post by keithdalby » Wed Jul 05, 2017 11:29 am

Michael wrote:
Wed Jul 05, 2017 9:07 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: 236
Joined: Wed Apr 05, 2017 9:31 pm

Re: DM-15, reset fault

Post by Michael » Wed Jul 05, 2017 11:50 am

keithdalby wrote:
Wed Jul 05, 2017 11:29 am
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: 545
Joined: Mon Apr 24, 2017 6:38 pm

Re: DM-15, reset fault

Post by keithdalby » Wed Jul 05, 2017 2:29 pm

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: 545
Joined: Mon Apr 24, 2017 6:38 pm

Re: DM-15, reset fault

Post by keithdalby » Sat Sep 30, 2017 6:04 pm

Ah, started doing this again. I'll take a screwdriver to it later

keithdalby
Posts: 545
Joined: Mon Apr 24, 2017 6:38 pm

Re: DM-15, reset fault

Post by keithdalby » Wed Oct 04, 2017 5:26 pm

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

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