DM42 hangs & unresponsive to reset; removed battery, random screen

If you're having problems with the hardware of a DM41X or DM42, post about them here.
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RJvM
Posts: 276
Joined: Wed Jun 02, 2021 9:21 am
Location: Gelderland, Netherlands

DM42 hangs & unresponsive to reset; removed battery, random screen

Post by RJvM »

I was just entering about 10 numbers to try out the extended stack, when the DM42 suddenly stopped responding, with a frozen-flashing screen.

Not responsive to the reset button.

After removing cover and battery (and re-inserting of course) the machine did not come up again, instead showing either a random dotted screen or a blank screen with just one black vertical line.

Now waiting to discharging of capacitators or something like that (battery removed again).

I will post when I know more. Hope I won't have to send it in
Robbert Jan, MSEE, RPN user since 1976 and a collector for many years I now own all the important ones: HP-35, 45, 55, 65, 97, 19, 21, 25, 34, 10-16, 41, 42, 71, 48, 50, Prime, DM41, DM42, WP43, C47, R47; Project 47 team member https://47calc.com
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RJvM
Posts: 276
Joined: Wed Jun 02, 2021 9:21 am
Location: Gelderland, Netherlands

Re: DM42 hangs & unresponsive to reset; removed battery, random screen

Post by RJvM »

Inserting a fresh battery solved the issue!
Robbert Jan, MSEE, RPN user since 1976 and a collector for many years I now own all the important ones: HP-35, 45, 55, 65, 97, 19, 21, 25, 34, 10-16, 41, 42, 71, 48, 50, Prime, DM41, DM42, WP43, C47, R47; Project 47 team member https://47calc.com
ctrclckws
Posts: 173
Joined: Sun Feb 17, 2019 4:30 pm

Re: DM42 hangs & unresponsive to reset; removed battery, random screen

Post by ctrclckws »

Could always try powering it by USB.
DM10, DM10L: 00031 / DM11, DM11L: 00112 / DM12, DM12L: 02074
DM15, DM15L: 11069 / DM16. DM16L: 02001 / DM41, DM41L: 00859
DM41X: 00036ß / 00181 DM42: 3108 / 6084 WP43: 0032
svarre69
Posts: 15
Joined: Tue Oct 01, 2019 2:09 pm

Re: DM42 hangs & unresponsive to reset; removed battery, random screen

Post by svarre69 »

My DM42 had a similar responce.

I was not warned, that the battery had run out. Changing the battery and loaded a fresh state solved the problem.

Also remember to use good quality CR2032 Cell batteries. The ones usually bought in bulks in supermarkets ain't allways reliable.

All the best
Peter
HPMike
Posts: 439
Joined: Fri Jul 21, 2017 11:01 pm
Location: DFW, Texas

Re: DM42 hangs & unresponsive to reset; removed battery, random screen

Post by HPMike »

svarre69 wrote:
Mon Mar 14, 2022 11:03 am
I was not warned, that the battery had run out. Changing the battery and loaded a fresh state solved the problem.
You can display the battery voltage in the header, so that you can see when it's getting low and needing replacement. Go to Setup > 4. Settings > 3. Status Bar and check 7. Power Voltage in Header. My experience is that once the battery voltage drops below 2.5 volts, it's time to replace the battery. Also, always connect your calculator to USB power whenever saving the calculator State or programs, or when updating the firmware, because these operations drain the battery significantly.
DM15L, S/N 00548. DM42, SN: 00159. DM41X, SN: 00973. DM32, SN 00054.
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