Re: Autona 2250 circuit

[mleuck <m.leuck@xxxxxxxxx>]

On Thursday, May 24, 2012 3:01:43 AM UTC-5, Terry Pinnell wrote:
> Hi, first post here.
>=20
> 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.
>=20
> 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 dela=
y
> has failed. Instead of a 30 second warning while I disarm it with my code=
,
> the siren sounds immediately.
>=20
> 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.
>=20
> 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.
>=20
> 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 activ=
e
> 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 =A33.64 from CPC.
>=20
> --=20
> Terry, East Grinstead, UK

If it's 15 years old and not functioning properly I imagine it's time to ge=
t something new and modern.