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Subject: RE: H340 : DC connector broken

RE: H340 : DC connector broken

From: Jammit Timmaj <jammit999_at_hotmail.com>
Date: Mon, 15 Sep 2008 15:46:14 +0000

> From: Antony.Stone_at_rockbox.open.source.it
> To: rockbox_at_cool.haxx.se
> Subject: Re: H340 : DC connector broken
> Date: Sun, 14 Sep 2008 22:24:14 +0100
>
> On Sunday 14 September 2008 20:58, Boby wrote:
>
> > Or would someone have for instance a picture showing precisely where to
> > solder each part of the DC socket ?
>
> http://www.lostlogicx.com/images/pics/iriver/p2070015.jpg might help.
>
>
> Antony.
>
> --
> "The joy of X!!?? I've always hated compiling graphical shite. You have a 10
> line program, and it ends up depending on the entire known universe."
>
> - Philip Hands
>
> Please reply to the list;
> please don't CC me.
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Also, the (-) of the charger shares the same ground as the screw holes, the metal frame of the USB jack, and is also grounded to the headphone common wire. With a continuity tester (available on pretty much any digital multi-meter) the wire of the DC jack that connects to all of those is the (-). One of the other DC connections would be (+). The third DC connection is probably connected to the (-) and can be found out with then multi-meter. Before you plug in the DC charger you may want to cut one of the wires and install a lightbulb of the same voltage rating of the charger. Just to make sure I'm understood about the lightbulb wiring, it'll be in series with the charging circuit. If the lightbulb comes on at full brightness that means the DC jack is wired backwards. Most semiconductors act like a forward biased diode when reverse polarity is applied. The lightbulb is not only an indicator but also as a current limiter to prevent a high reverse current.

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Received on 2008-09-15


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