Re: Unusual behaviour DSC-864ULC

["vssdoug" <vssdoug@xxxxxxxxx>]

"Frank Kurz" <tech@xxxxxxxxxxxxx> wrote in message
news:5tKdnbIaQpZf-XHQnZ2dnUVZ_hadnZ2d@xxxxxxxxxxxxxxx
> OK... This is the second call I've attended on this control.  It's less
> than a year old.  The last time this happened was two months ago and the
> problem had cleared by the time I'd arrived on site.  This time around
> however, the AC light was "off" and the system looked to be running on
> battery.
>
> Here's the troubling part.  Voltage at the AC terminals was 16.9VAC.
> Charging voltage was 13.2VDC.  Yet the panel was displaying an AC fault.
> There is no visible problem with the board.  I've downloaded the software
> and checked all the relevant locations.  Panel's programmed for 60Hz, etc.
> This looked to me to be a board level problem.  I disconnected the battery
> (didn't touch the AC) and the system "died".  I reconnected the battery
> and nothing happened.  I then disconnected the AC and reconnected it.
> Panel comes back on line (displaying the normal clock failure trouble).
> Reset the clock and the panel clears and operates normally.
>
> Since this is the second time the same trouble has appeared, I figured I
> should replace the common control (to be on the safe side).  I swapped the
> sucker out and downloaded the information from the old system to the new
> one.  Everything works.  All zones annunciate.  I'm gonna take the old MB
> and set it up at the office.  Anyone encountered this problem before?  I'm
> thinking this could be a "hold-over" from that batch of bad rectifiers but
> the strange thing is the panel is only seven months old and the power
> section of the board looks to be completely normal.
>
> Oh...  One more thing.  The station received an AC Failure signal with the
> restore when I reconnected power.
>
> Weird.
>
>
> --
> Frank Kurz
> www.firetechs.net


I'd just replace the board, the cost of a return service call is more than
the cost of a replacement board

Doug