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Scantronic 500r+ Noise Solution Advice required (please)



I installed a Scantronic 500r+ wireless control panel + PIR's probably 15 t=
o 20 years ago. I have a AG6 external bell + strobe unit hard wired.
The system has worked reliably since day one then about a month ago the bel=
l + strobe unit started making more frequent cheeping noises (like very lou=
d magpies). I tried to solve the problem by trying various tests but finall=
y figured out that the AG6 tamper switch had become faulty. I bought a repl=
acement Honeywell AG6 from Amazon and installed - easy, until 2 days later =
the Scantronic control panel has stated making a low droning noise from the=
 loudspeaker. There is no 'fault' registered in the system but I have had t=
o temporarily disable the whole system by opening the control panel door.
It seems too much like a coincidence that I replace the Ag6 bell + strobe a=
nd very soon after the control unit speaker starts acting up - as if its pi=
cking up a feedback signal from somewhere.
I've tried Cooper Scantronic but you need to get past the registered instal=
ler code system ........
I would appreciate any suggestions.
Many thanks

Ian MacKenzie


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