Hi, first post here.
Anyone know possible source of the circuit diagram for my 15 year old control unit please? It's an Autona Series 200, model 2250. Web searches for Autona Limited, Princess Risborough, lead to an unrecognised phone number. This morning I'll try Chiltern Electronics who are in the same location, but I'm not too hopeful.
The re-entry delay on mine has failed. Probably down to my impatience. I removed the front door reed relay sensor door because it had become unreliable, often 'sticking' in its passive state instead of triggering the alarm re-entry delay warning. After the replacement the re-entry delay has failed. Instead of a 30 second warning while I disarm it with my code, the siren sounds immediately.
I think I must have damaged that section of circuitry while soldering in the reed. I did check that the passive voltages were zero, but that's the only cause I can think of.
So I might dust off my shed workshop bench and try making an add-on to provide this lost functionality. Access to the circuit diagram would be a great help.
There's one other longshot approach I'm trying in parallel. By removing 4 screws I was able to get a good look at the circuit board. Its main active component is a PIC16FC4. I know virtually nothing about PICs, but just in case that *has* become faulty I thought it worth dropping in a replacement. I couldn't find that specific one in stock anywhere so I've taken a gamble and ordered a PIC16C54-XTI/P (8BIT CMOS MCU, 16C54, DIP18) at £3.64 from CPC.