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How can I check or repair the siren in my Napco Security System ?

Siren no longer makes a correct sound What is causing this, and how do I fix it ?
Dino H, February 2011
What is the model of the system too please?

Alarm, February 2011
dont know what i mean any more:-)

gts, February 2011
Napco is an American panel, seen a few about.
Can be hard wired or wireless.

Did you mean ACPO ?

Alarm, February 2011
there you go again alarm guy,wanting sensible answers to your questions,i mean if he wanted to tell you the sound it makes,he would have,:-)and since when did the nat.asso of chief police officers make alarm systems??

gts, February 2011
Internal/External ?
What sound does it make, what did it used to make.

One for you, how long is a piece of string?

Alarm, February 2011