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Subject: Re: JBR V1 hardware question

Re: JBR V1 hardware question

From: Linus Nielsen Feltzing <>
Date: Thu, 27 Mar 2008 09:25:38 +0100

Neon John wrote:
> So it seems, the path from the charging jack and regulator chip to the A/D input is
> intact while the path to the batteries isn't. I'm currently charging the batteries
> on an external charger but I want to fix this problem. Before I rip into the thing
> again, I'm soliciting suggestions from JBR hardware experts as to physically where I
> ought to start looking. This is probably going to be a broken trace from board
> flexure during the drop but since there is a lot of stuff around the charging jack,
> I'm soliciting advice before I proceed.

Hi John!

First, you could enter the debug menu and watch the AN7 value with or
without the charger. It should be higher when the charger is attached,
probably 0xFF.

Then you should check the 34063A chip (I think it's U17). Begin at pin 6
(VCC). You should see the charger voltage there. The output voltage is
at pin 2.

If that is OK, you should be able to trace the output voltage from the
34063A to the transistor Q3, then to L4 and then D8 and R61. Then I
think you should have reached the battery terminals. Reheat all
suspicious soldering joints.

Good luck!

Received on 2008-03-27

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