DM42 spontaneously rebooting to boot loader

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Kf6gpe
Posts: 29
Joined: Thu Jun 15, 2017 8:01 am
Location: Boulder Creek, CA, USA
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DM42 spontaneously rebooting to boot loader

Post by Kf6gpe »

Howdy!

I have an early-unit DM42 I'm seeing some odd behavior with.

If I leave it on my desk overnight, when I turn it on the next morning it's at the boot loader screen; pressing EXIT causes it to verify the QSPI flash, and then launches Free42, although it's wiped memory ("MEMORY LOST").

Has anyone else seen this?

I've tried charging it overnight, but I don't think it's a battery issue; the charge indicator shows a full charge.
amafan
Posts: 74
Joined: Tue Sep 29, 2020 11:40 pm

Re: DM42 spontaneously rebooting to boot loader

Post by amafan »

The DM42 does not have a rechargeable battery. I operates on a 2032 lithium coin cell. Have you tried changing the battery for a fresh one?
DM41X (#6476), 42 (#458) - HP 17BII, 35(2), 45, HP 27S, 28S, 30B, 41CV, 42S, 48S, 35S, HP10bII+, 12C PLAT
I may have a problem!
Kf6gpe
Posts: 29
Joined: Thu Jun 15, 2017 8:01 am
Location: Boulder Creek, CA, USA
Contact:

Re: DM42 spontaneously rebooting to boot loader

Post by Kf6gpe »

Oh, good point! I'd totally forgotten that, because it just lasts _forever_. I think I was confusing it with the Prime, my other go-to.

I'll throw some new batteries in it tomorrow and see how it does. That may be it, but if that's the case I've got some distrust over the battery gauge, because it's not reporting a low battery.

Thanks!!

I'll report back here with results for anyone else that's curious.
Kf6gpe
Posts: 29
Joined: Thu Jun 15, 2017 8:01 am
Location: Boulder Creek, CA, USA
Contact:

Re: DM42 spontaneously rebooting to boot loader

Post by Kf6gpe »

Thirty-six hours and it's still running!

Interestingly, the battery gauge was only one bar down from full. I think I should be trusting the voltmeter or just looking for this behavior in the future.

Thanks again for pointing me straight on the no-rechargable-battery thing! I feel pretty stupid!
amafan
Posts: 74
Joined: Tue Sep 29, 2020 11:40 pm

Re: DM42 spontaneously rebooting to boot loader

Post by amafan »

No problem. Just happy to be of service. We’ve all been in your shoes.
DM41X (#6476), 42 (#458) - HP 17BII, 35(2), 45, HP 27S, 28S, 30B, 41CV, 42S, 48S, 35S, HP10bII+, 12C PLAT
I may have a problem!
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