DM41X Unresponsive to RESET action

If you're having problems with the hardware of a DM41X or DM42, post about them here.
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Ángel Martin
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Joined: Mon Apr 24, 2017 8:19 pm

DM41X Unresponsive to RESET action

Post by Ángel Martin »

Also tried the PRGM - RESET - PRGM sequence to no avail.
Any suggestions at this point?

ÁM
rprosperi
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Re: DM41X Unresponsive to RESET action

Post by rprosperi »

Does the unit turn on? I'd try changing batteries, even if you think the one installed is good; despite sounding obvious, this has worked for me more than once. When battery is removed, press [ON] and then reset once or twice to drain any pending charge. If no response at that point it likely means a h/w failure of some sort and you should email Michael.
--bob p

DM42: β00071 & 00282, DM41X: β00071 & 00656, DM10L: 071/100
Ángel Martin
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Re: DM41X Unresponsive to RESET action

Post by Ángel Martin »

Thanks for the input Bob. The unit is always ON, showing an ominous "3.00" in the X register. It cannot be turned off, reset, or PRGM-reset.
It feels like a hangup in the polling points but it's very strange the reset sequences don't work/

I'll try removing the battery next, fingers crossed.
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rudi
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Re: DM41X Unresponsive to RESET action

Post by rudi »

I’m certain that removing the batteries will eventually switch the calculator off ;-)
No idea if it helps resetting though ;-)

Back in the early 80’s, I remember that when putting my HP-41CV into synthetic mode, it could hang. Removing the batteries didn’t help immediately, probably due to some capacitors holding some voltage, but shorting the battery connectors (with battery removed!) with a paper clip helped immediately. Otherwise it had to sit without battery for days to be able to start up again.
/Rudi

DM-42 (s/n 06999), HP-42S, HP-35s, HP-11c, HP-32SII (ex HP-41CV, ex HP-75C, ex HP-48G + a lot, really lot of a accessories)
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Ángel Martin
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Re: DM41X Unresponsive to RESET action

Post by Ángel Martin »

Nah, tried all of the above but did not work, the unit is still bricked.\
Will need to ship it to the factory, I guess... what a bummer.
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rudi
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Re: DM41X Unresponsive to RESET action

Post by rudi »

Isn’t there also reset buttons inside on the PCB?
I vaguely recall having seen that somewhere here on the forum. But they might just be the same as can be pressed from the outside?
/Rudi

DM-42 (s/n 06999), HP-42S, HP-35s, HP-11c, HP-32SII (ex HP-41CV, ex HP-75C, ex HP-48G + a lot, really lot of a accessories)
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Walter
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Re: DM41X Unresponsive to RESET action

Post by Walter »

Ángel Martin wrote:
Sun Dec 19, 2021 1:02 pm
Nah, tried all of the above but did not work, the unit is still bricked.\
Will need to ship it to the factory, I guess... what a bummer.
Please look up p. 204 of the WP43S Reference Manual and try what is proposed there. You find it here: https://gitlab.com/Over_score/wp43s/-/tree/master/docs
WP43 SN00000, 34S, and 31S for obvious reasons; HP-35, 45, ..., 35S, 15CE, DM16L S/N# 00093, DM42β SN:00041
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rudi
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Re: DM41X Unresponsive to RESET action

Post by rudi »

Yes - thats what I remembered reading ;-)
Hope it works
/Rudi

DM-42 (s/n 06999), HP-42S, HP-35s, HP-11c, HP-32SII (ex HP-41CV, ex HP-75C, ex HP-48G + a lot, really lot of a accessories)
Denmark
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