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Unusual behaviour DSC-864ULC

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.

Reply to
Frank Kurz
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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.

Reply to
nick markowitz

check the capacitors around the voltage regulator, if you see any swelling or slight cracks, that tends to show they're going bad, if they start changing value it will effect the sensor ckt for the ac loss detection..

Chinese caps have a bad habit of going bad early.. ((remember all those bad pc board a fee years ago))

RTS

Reply to
RockyTSquirrel

It takes you months to figure out you should replace the board?

Reply to
mleuck

Yep. System was clear when I arrived on site the first time. Event log only showed an AC failure. Customer wasn't home when it happened and couldn't verify that he actually had one. Other than this first event two months ago, the system has been trouble free. Anything else you want to know? :-)

Reply to
Frank Kurz

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

Doug

Reply to
vssdoug

Yep. System was clear when I arrived on site the first time. Event log only showed an AC failure. Customer wasn't home when it happened and couldn't verify that he actually had one. Other than this first event two months ago, the system has been trouble free. Anything else you want to know? :-)

----------------------------------------------------------------------

No he wont need that you tell him anyting more.. cause he knows.. he know every thing.. even the color of you shorts..

By the tone he used he is telling you that he would have known that the board was in problem and that he would have changed it the first time.. cause he would have known..How?? dont ask... but he knows!

Reply to
<petem001

Thanks Petem I needed a good laugh.... :)

James B

Reply to
James B

I think Rocky has the answer.

Sounds to me like the filtering of the DC was failing. Not likely something you could see with a digital meter .... either. Maybe just a little jumping of numbers.

It would be more detectable with an analog meter. .... if you remember what that is ..... ;->

Reply to
Jim

Heh. I have an old Micronta that's still going strong. I keep it as a backup for when solar flares take out the Fluke. ;-)

Reply to
Frank Kurz

See this one yesterday?

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Amazing Solar Prominence Eruption!

We only have 562 days left on Earth anyway!

Reply to
G. Morgan

I'm never buying a DSC product again. I just had a bad experience with getting a new account (on the protected area). Their customer support is non-existent, or all robots.

Reply to
G. Morgan

No, you're wrong. Harold says it's October 21st.

Reply to
Frank Kurz

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