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

Re: I can't stop my H340 anymore

From: Boby <>
Date: Mon, 6 Oct 2008 16:13:19 +0200

>> From:
>> To:
>> 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

> 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.

Hi !

Thanks for your answer.
I have still questions. Sorry but I'm not a specialist in electronic,
not at all ! I don't even know what is a switch, what it looks like.
Where is this "switch" that works bad ? Just under the button stop of my
H340 ? You wrote that I should replace it... Where can I buy such a
switch ? And is it easy to replace ?
If instead of replacing it (which sounds to me really difficult, isn't
it ?),I continue to switch off my player by using the reset button, is
there a risk for my H340 ? (I doublt this reset button is made to be
used twice or three times a day !)

I noticed a new point thanks to my magnifier : if I start my player with
the normal fireware, when I try to switch it off, it shows me a picture
of battery with written under it "loading" for a short time then it
writes "Please remove battery pack". Would that mean that it's not the
switch which is bad but rather that my player doesn't stop because it
"thinks" it's still under an external power ?
Last question : I set up in rockbox the idle poweroff on 1 minute. In
spite of this, it doesn't stop. It's said in the manual that it doesn't
stop when the charger or usb is connected. So could it also be that the
player "thinks" that there is a "battery pack" connected ???

Thanks a lot for your help


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Received on 2008-10-06

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