[hpsdr] Tapr hombrew hermes shutdown problem

[Oliver Goldenstein]

Hi Phil !

You are right. The BOM says 2 A but i checked what i have ordered and they
are 1.10 A.

U did another test this morning powering rhe 5 V Bus from an external power
supply.

The voltage on the power supply decreased to 3.8 Volt 1.4 A!

With powering from one 13.8 Voltvpower supply  i have around 0.7 to 0.8 A.
And after the shutdown 0.3 A.

I am confused.

73 Oliver
Am 19.02.2013 06:47 schrieb "Oliver Goldenstein" <
oliver.goldenstein at gmail.com>:

> 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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>>
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