[hpsdr] Tapr hombrew hermes shutdown problem

[Oliver Goldenstein]

Hi Phil !

The Fuses are the 2 A ones and they are ok.

73 Oliver DL6KBG
Am 19.02.2013 02:07 schrieb "Phil Harman" <phil at pharman.org>:

> Hi Oliver,
>
> Check F3, on early BOMs it was 1A but was increased to 2A on later
> versions.
>
> 73 Phil..VK6APH
>
>
>
>
> > ***** High Performance Software Defined Radio Discussion List *****
> >
> > Hi All !
> >
> > I am having a problem since sunday. I am not making progress in debugging
> > the error. Hermes ran nearly the whole weekend during the contest. The
> > enclosure was warm but not hot.
> >
> > The problem:
> >
> > The board starts fine es every time and i can run it for lets say  one
> > minute with cuSDR64, ghpsdr3. After the minute the leds are only showing
> > half of the light than before. the board is then no more reachable and
> > cannot be discovered. When i start the board  in bootloader mode
> > everything
> > is normal. When i remove the jumper and powercycle the board it runs also
> > fine just to the time i put the networkcable in. it seems that network
> > traffic can speed up that failure.
> >
> > I measured as follows:
> >
> > U18, PIN3 = 13,6 Volt
> > U18, PIN2 = 11,9 Volt
> >
> > in normal operation and after shutdown.
> >
> > The SMPS 5V output shows 4,96 V also in normal conditions and after the
> > shutdown (measured at L32). So i think the 12V and 5V Buses are ok ?!
> >
> > Now i measured at C153 and C174 and the input Pin of the LTC1529. During
> > the normal operation i have 4,45 Volt there. During the minute until the
> > shutdown the Voltage decreases down to 2,83 Volt in 0,01 Volt steps. The
> > last steps are faster.
> >
> > When i understand the schematics right i should have the same voltage at
> > the end of L32 and at C153.
> >
> > This must be something serious or silly. I hope the last one.
> >
> > In bootloader mode i am able to program and successfully reprogrammed the
> > board back to 2.2 which results in the same behaviour.
> >
> > 73 Oliver DL6KBG
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