Re: Unusual behaviour DSC-864ULC

[nick markowitz <nmarkowitz@xxxxxxxxx>]

On Jun 6, 1:25=A0am, Frank Kurz <t...@xxxxxxxxxxxxx> wrote:
> OK... This is the second call I've attended on this control. =A0It's less
> than a year old. =A0The last time this happened was two months ago and th=
e
> problem had cleared by the time I'd arrived on site. =A0This time around
> however, the AC light was "off" and the system looked to be running on
> battery.
>
> Here's the troubling part. =A0Voltage at the AC terminals was 16.9VAC.
> Charging voltage was 13.2VDC. =A0Yet the panel was displaying an AC fault=
.
> =A0 There is no visible problem with the board. =A0I've downloaded the
> software and checked all the relevant locations. =A0Panel's programmed fo=
r
> 60Hz, etc. =A0This looked to me to be a board level problem. =A0I
> disconnected the battery (didn't touch the AC) and the system "died". =A0=
I
> reconnected the battery and nothing happened. =A0I then disconnected the
> AC and reconnected it. =A0Panel comes back on line (displaying the normal
> clock failure trouble). =A0Reset 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). =A0I swapped
> the sucker out and downloaded the information from the old system to the
> new one. =A0Everything works. =A0All zones annunciate. =A0I'm gonna take =
the
> old MB and set it up at the office. =A0Anyone encountered this problem
> before? =A0I'm thinking this could be a "hold-over" from that batch of ba=
d
> 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... =A0One more thing. =A0The station received an AC Failure signal wit=
h
> the restore when I reconnected power.
>
> Weird.
>
> --
> Frank Kurzwww.firetechs.net

I'm with you sounds like a board problem Frank if transformer is
correct etc. you could possibly had a spike or surge damage the board
with no apparent damage have seen this on several different panels
where you power down reset and then it seems fine for another few
months.