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Subject: RE: I can't stop my H340 anymore

RE: I can't stop my H340 anymore

From: Jammit Timmaj <jammit999_at_hotmail.com>
Date: Fri, 3 Oct 2008 16:31:14 +0000

> From: sup.bio_at_club-internet.fr
> To: rockbox_at_cool.haxx.se
> Subject: I can't stop my H340 anymore
> Date: Fri, 3 Oct 2008 11:52:30 +0200
>
> Hello and sorry for my poor english
>
> I replaced the battery of my H340 and repaired the AC connector which
> was broken.
> Since, I can't switch off my H340 anymore.
> The stop button still works when I want to stop it playing (short
> pressure) but it doesn't work anymore when I want to switch off my
> player (long pressure)
> Note that I have the same problem with rockbox or with the standard
> fireware and that from time to time, but pretty rarely, it works
> normally !
> I'm eyes disabled and uses rockbox talking. When I try to switch off my
> player under rockbox by a long pressure on the stop button, I can hear
> it repeating and repeating the name of the menu where it is which proves
> that it notices my pressure on the button but recognizes it as a
> repetition of short pressures.
> I selected the option in rockbox to switch off the player if it is unuse
> for a while but it doesn't seem to work either.
> So, I have to switch my player by using the reset button.
>
> My questions :
> Would you have a solution ? An idea ? If it is due to the button which
> is broken, is it possible to modify rockbox in order to use another
> button to switch off my player ???
> Is it dangerous for my player if I use too much the reset button ?
>
> Thanks a lot
>
> Boby
>
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It sounds to me that the switch is "mostly" bad. When you press on a normal switch it actually goes through multiple open and closed cycles very quickly before setting on closed. This is called switch bounce and is normal. All electronic devices are designed to realize that switches do this and eliminate any problems of assuming you're pressing the switch many times really quickly by reading when the switch closes (pressed) for the first bounce and ignores any other signals for a few microseconds while waiting for the switch to stop bouncing. If you have a partially bad switch, when you press down on it it'll keep bouncing for a much longer time and will confuse the electronic brain into thinking you're pressing it many times very quickly. You probably have to replace the switch. A temporary fix (it will still get worse) is to put a few pico farads of capacitance in parallel with the switch. If it acts better after adding the capacitor it means the switch is going bad and needs replaced.

Your English is fine.

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Received on 2008-10-03


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