Re: Keypad Fire Activated??

On Oct 6, 7:28ï¿½am, "ABLE_1"
<royboynos...@somewhere.net> wrote:
> I assume you meant to say >> "I have had mysterious keypad panics from a
> static discharge"<<
>
> Then you must have been able to repeat the trip somehow. ï¿½How
els
e would you
> know.
>
> No one was reported near the keypad so I can't pursue that possibility.
>
> Les


Here's another possibility. I use Napco. Napco's keypads have soft
rubber buttons with a hard nob on the back. The hard nob pushes a
flexable memebrane with PCB lands on it up against a hard PCB with
lands on it shorting the two together. What  has happened is ....
after prolonged use, the flexible memebrane begins to distort from the
pressure of the little nob on the back of the key. Over time, I guess
due to heat or cold, the warped membrane gets pretty close to the hard
PCB and sometimes the customer will hear faint intermittant beeping
from the keypad. The membrane can touch the PCB ever so slightly. And,
I think the memebranes just might warp a little from age too. If it's
just a single key and the keypad isn't where it would keep someone
awake it's ok. People will usually live with it.  But occasionally,
I've had panic or fire signals sent by these "chirping" keypads. So
now if I hear of keypads beeping for no reason, I really try to get
them to let me change them out.
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