Re: [Paparazzi-devel] YAPA v2.0 Hardware failures

[Chris Gough]

Hi Jefferson,

The cause is not obvious to me, but I wonder how are you powering your
system? page 4 of the YAPA manual
(http://paparazzi.enac.fr/w/images/Yapa2.pdf) lists these methods:

a) (prefered) Servo's from BEC and autopilot from BAT: leave Switch Open
b) (ideal for testing) Everything from BAT: short the Switch (close)
c) Everything from BEC: unsolder the PTH08080 and short the Switch

Can you say more about these "shorts", how are they occuring?

Chris Gough

On Fri, Jun 29, 2012 at 12:59 PM, Romney, Jefferson S
<address@hidden> wrote:
> I remembered somewhat wrong. I went back and looked at them again. There are 
> four that have gone bad:
> 1. This one happened just as I said. the 5v regulator went bad like you 
> mentioned, and the 3.3v line is shorted to ground. but the 5v line is not 
> shorted.
> 2. This one turned on, but gave bad pwm signals to the servos. as far as i 
> remember, this one never actually quit completely.
> 3. This one a wire came loose and shorted so no question there.
> 4. on this one I plugged it in the other day and c38, the big capacitor on 
> the bottom went up in smoke. battery voltage is shorted and 5v is shorted but 
> the 3.3v line is not. my guess is that this may be a short in the power 
> supply as well.
> 5. This one I thought had done the same as #1 but on further investigation, i 
> found it was the barometer not the autopilot itself. when I unplugged the 
> baro, it worked fine.
>
> I guess I really only have questions about 1 and 4.
>
> Thanks,
>       -Jefferson Romney
>
> ________________________________________
> From: address@hidden address@hidden on behalf of Chris Gough address@hidden
> Sent: Wednesday, June 27, 2012 9:14 PM
> To: address@hidden
> Subject: Re: [Paparazzi-devel] YAPA v2.0 Hardware failures
>
> I've never seen that before. How does the power supply smell?
>
> Chris Gough
>
> On Thu, Jun 28, 2012 at 12:50 PM, Romney, Jefferson S
> <address@hidden> wrote:
>> I have been using Yapa v2 autopilots and loving them, but I have had some of 
>> them fail for no apparent reason. has anyone else seen this?  Usually it 
>> works once, I unplug it, and plug it back in and nothing turns on and it 
>> won't work again. Any ideas as to how I can prevent this?  Thanks for any 
>> information.
>>
>>  -Jefferson Romney
>>
>> _______________________________________________
>> Paparazzi-devel mailing list
>> address@hidden
>> https://lists.nongnu.org/mailman/listinfo/paparazzi-devel
>
>
>
> --
> .
>
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