Hi,
I have a problem with a Scantronic 9448ES, in that the Mains LED on the 9427 panel is flashing, otherwise the alarm seems to work perfectly,
I've opened the control box and factory reset it so I have the engineers code.
The PCB Shows 20v AC input from the transformer and 10.8v DC out to the battery (Which is brand new)
I've removed the PCB and de-soldered the voltage regulator and replaced it with a new one as that seemed the most likely suspect.
However I'm still getting the flickering mains LED on the 9427 keypad.
(If it makes any difference working off the manual, the wiring connections on the PCB actually match those shown for the 9448+ and not the ES, don;t know if they shared a PCB towards the end or something?).
There is a maintenance contract on the system over the last ten years and the battery has been replaced regularly as part of that, so its not as if a dead battery has killed it.
My next step is to remove the PCB again and check all the other components, (although theres no visible signs of failure)
My questions are:-
1) When I take the panel out I'm using the battery to silence the external alarm connected to the +/- ve hold off - how long does a a battery last doing this? (lazy question I could measure the current draw but its all back together at the moment - I'm guessing its not a massive draw and its going to last a long time?
2) Any known issues on this panel - if its not the Transformer (Getting 20v ac in ok) and its not the regulator as I've changed it, what's it likely to be? I'm thinking a resistor but any ideas on which one?
and other tests I should be considering?
Failing that I'm considering replacing the control unit for a new 9448+ off ebay - any pit falls? i'm guessing it'll be a straight swap as I've already identified all the wiring, its just adding my downstairs keypad to one as an additional keypad I'm a little uncertain on.
Thanks
Dave