[ARTS] Arts 2 Wiring and Sequence Question

[Mike Roberts]

The damage to the transistor (the "chip" isnt an amp I suspect it is 
a
transistor or fet ( another kind of transistor)) and tantalum 
capacitor
look more like physical damage than in-use failure damage. The 
transistor
looks like it has been chipped or perhaps crushed. The marks on the
capacitor also look lke tooling marks or damage. In-use failure 
(letting
the "smoke" out) usually shows up as charring / blackening of the 
parts.
Looking at the location and shape of the marks I wonder if they might 
have
been caused by a screw or a nut used to hold the board in place by 
the
mounting post? Perhaps a washer? Is it possible that a screwdriver or
spanner slipped while doing up the retaining screw?

Mike 8-{>

> Hey Guys,
> 
> I have an ARTS 2 and I have flow it 5 times now with no problems.  This past
> weekend I had a charge blow while I was arming it on the pad.
> 
> Let me tell you how it was wired because I think it was a sequence issue but
> I am not sure.  First off I thought someone told me to use 2 switches.  1 to
> power the arts and the other to make the pryo battery hot.  So I wired the
> 1st switch in line between the + side of the 9v battery and the arts unit,
> simple enough.  I did the same thing with the pyro battery.  The + lead is
> disconnected when the screw switch is not in.    I think the 5 previous
> flights I armed the pyro battery and then turned on the ARTS 2.  I think this
> time I did it in reverse so when I screwed in the pyro switch     BOOM.
> Scared the crap out of me.  
> 
>  
> 
> Now having said that, when we took the ebay out and started trying to examine
> what had happened some one noticed a chip in one of the CHIPS.  Someone
> thought the chip was an amp.  I don't know but I have attached a picture of
> it.  I never noticed it so I don't know if it happened on an earlier flight
> or what.
> 
>  
> 
> Any thoughts?
> 
>  
> 
> My buddy who flies a ton of ARTS rewired it for me on the field.  Actually we
> put another Arts 2 unit in the rocket and flew it with that unit.  I plan on
> connecting the unit up when I get home today and see if there is any info on
> it.
> 
>  
> 
> Thanks for any help.
> 
>  
> 
> If these photos are not hi-res enough please let me know and I can send you
> another version.
> 
>  
> 
>  
> 
>  
> 
>  
> 
> Joey Wright
> 
> Russell Corporation
> 
> (256) 500-5696
> 
>  
> 
> 
> 
> 
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