Hi all,

Our home is fitted with a 19 year old wired intrusion alarm which has
worked faultlessly since it was installed by a sub to the the general
contractor who built the place. The only service it's required has been
changing the backup gel cell every few years.

I have the technical knowledge and equipment to service 20 year old
electronics like this down to the discrete component level. But, proper
documentation makes the job a lot easier and avoids my having to trace
out and "reverse engineer" a device just to find out what's going on
with it's circuitry.

The core Control Panel in our home's system is a "Guardaware CU-22"

The followng accessories are also used:

Moose Products, Inc. MPI-11 Siren Driver module

Corby Industries Model 86 Latching Relay (Used to bypass an IR motion
detector.)

Guardaware LM-1 (I haven't yet figured out its function, but I suspect
it might be used to blink the green "Loop Closed" LRD's on the keypads
to indicate that the alarm's was tripped, after the "Burglar Bell"
output has timed out.)

We had some unusually severe lightening storms here last week which
knocked out power to the neighborhood. Coincidentaly the CU-22 had the
driver transistor for it's "Burglar Bell" output relay go leaky so the
relay was pulled in anytime the CU-22 was powered by it's ac source,
regardless of the Panel's status. Interestingly enough, if the CU-22 was
running off it's backup battery the board's "12 volt" bus was lower by
enough so the transistor leakage wouldn't quite pull in that relay.
(It's up around 15 volts when powered by the ac line.

I was lucky enough to be able to troubleshoot and repair that one easily
enough, but it caused me to think about future service needs. I do have
the Installer's Manual which came with the CU22, but I'd sure like to
get a schematic of the whole pc board to tuck away for the next time I
have to fix it. Schematics of the accessory units would also be nice to
have.

I haven't been successful Googling up anything much about those items,
probably because they're all nearly 20 years old now. I can't even tell
out if the Control Panel's maker "Guardaware, Inc." is still in business.

Can anbody help me with prints or leads to places where I can get them?

Thanks guys,

Jeff
--

Jeff Wisnia (W1BSV + Brass Rat '57 EE)

"If you can smile when things are going wrong, you've thought of someone
to blame it on."

i think guardware has gone bye-bye. Corby is still around. I've never
had good luck finding schematics for alarm panels. The good news is that
the panels and keypads are pretty cheap these days.

"Jeff Wisnia" wrote in message
...
Hi all,

Our home is fitted with a 19 year old wired intrusion alarm which has
worked faultlessly since it was installed by a sub to the the general
contractor who built the place. The only service it's required has been
changing the backup gel cell every few years.

I have the technical knowledge and equipment to service 20 year old
electronics like this down to the discrete component level. But, proper
documentation makes the job a lot easier and avoids my having to trace
out and "reverse engineer" a device just to find out what's going on
with it's circuitry.

The core Control Panel in our home's system is a "Guardaware CU-22"

The followng accessories are also used:

Moose Products, Inc. MPI-11 Siren Driver module

Corby Industries Model 86 Latching Relay (Used to bypass an IR motion
detector.)

Guardaware LM-1 (I haven't yet figured out its function, but I suspect
it might be used to blink the green "Loop Closed" LRD's on the keypads
to indicate that the alarm's was tripped, after the "Burglar Bell"
output has timed out.)

We had some unusually severe lightening storms here last week which
knocked out power to the neighborhood. Coincidentaly the CU-22 had the
driver transistor for it's "Burglar Bell" output relay go leaky so the
relay was pulled in anytime the CU-22 was powered by it's ac source,
regardless of the Panel's status. Interestingly enough, if the CU-22 was
running off it's backup battery the board's "12 volt" bus was lower by
enough so the transistor leakage wouldn't quite pull in that relay.
(It's up around 15 volts when powered by the ac line.

I was lucky enough to be able to troubleshoot and repair that one easily
enough, but it caused me to think about future service needs. I do have
the Installer's Manual which came with the CU22, but I'd sure like to
get a schematic of the whole pc board to tuck away for the next time I
have to fix it. Schematics of the accessory units would also be nice to
have.

I haven't been successful Googling up anything much about those items,
probably because they're all nearly 20 years old now. I can't even tell
out if the Control Panel's maker "Guardaware, Inc." is still in business.

Can anbody help me with prints or leads to places where I can get them?

Thanks guys,

Jeff
--

Jeff Wisnia (W1BSV + Brass Rat '57 EE)

"If you can smile when things are going wrong, you've thought of someone
to blame it on."

selldastuff wrote:

i think guardware has gone bye-bye. Corby is still around. I've never
had good luck finding schematics for alarm panels. The good news is that
the panels and keypads are pretty cheap these days.

Thanks, and I agree that buying new stuff would not break my bank, even
though I'll probably have to replace the three "dumb" keypads which
control the system.

As you may have suspected, for me it's just an ego trip to resurrect
something like that by locating and replacing a failed 25 cent part.
Being successfully retired, I've got the free time to do things like that.

Others would rather play golf, go fishing or do the New York Times
crossword puzzle....

Regards,

Jeff
--

Jeff Wisnia (W1BSV + Brass Rat '57 EE)

"If you can smile when things are going wrong, you've thought of someone
to blame it on."