Radionics Omegalarm D4112 problem

[Gerry]

Hi all!
I've got an older panel (D4112, as posted in subject) and I have a
problem that I believe started during a lighning storm. It has
survived 8 years of close strikes, but I think it finally took a hit.
The problem I have is that the Zone 1 LED is always on. This zone is
a motion detector inside the house. I took the sensor wiring off the
terminal strip and put a 1.8k resistor across the terminals. No
change, zone still lit. Have any of you repaired these boards? Is
there a component on the board that this problem points to? I'm
trying to save some money and fix it, but a modern panel would be nice
too. Hmm, maybe insurance would cover it?
Thanks! -Gerry

 

[Jim Rojas]

Take a close look on the circuit board near the zone. There may be a diode
or resistor that is blown. Take a meter reading on a good zone, then compare
it to the bad one. It might just be a 25 cent fix.

Jim Rojas

 

[Jim Rojas]

Zone 1 is 1.8K
Zones 2 thru 6 are 1K

Zone 1 can be used as a burg zone or 2 wire smoke loop.

Jim Rojas

 

[Aegis]

You designed the 4112?

Jim you are correct. Zone one can be used for two wire smokes etc and is
1.8k. Its been a few years since I
designed that panel at Radionics in Salinas. Before
Detection systems and Bosch group.......

Richard Luehring
*****************************

 

[Mark Leuck]

Hi all!
I've got an older panel (D4112, as posted in subject) and I have a
problem that I believe started during a lighning storm. It has
survived 8 years of close strikes, but I think it finally took a hit.
The problem I have is that the Zone 1 LED is always on. This zone is
a motion detector inside the house. I took the sensor wiring off the
terminal strip and put a 1.8k resistor across the terminals. No
change, zone still lit. Have any of you repaired these boards? Is
there a component on the board that this problem points to? I'm
trying to save some money and fix it, but a modern panel would be nice
too. Hmm, maybe insurance would cover it?
Thanks! -Gerry

Normally I would suggest that panel makes a great boat anchor however the
box is too small and the circuit board is too light for that purpose so
instead I will say they make great door stops.

 

[Mark Leuck]

The Radionics 4112/8112 use a 1k 1 percent eol resistor
for burg zones . Check the loop resistance for that zone
including the eol.
The Radionics panels also liked a good earth ground.

Is this a G model? It will show on the tag usuually
on the cusom processor. This model had very good
mov and diode protection built into the the board.

I thought the G model was the 8112?

 

[Gerry]

I see nothing referring to a 'G' model on the box, board, or chip.
Yesterday I looked carefully at both sides of the board, and lifted a
resistor to check it's value. It was fine. I'm not sure exactly
which ones are in this zone, but I was following the traces on the
board. I just hate to have a new unit put in when it's probably a
piddly component. I'd compare zones, but zone one is the one
different one. Used with my motion sensor...
Maybe I should lift a few more and check some diodes too.
-Gerry

 

[alarman]

Alarminex wrote

I've tried that but ............... the door keeps closing anyway.

How about just using the box to keep something in?

Your dentures maybe? Ahhhhhhahahahahahahaha!
js

 

[Gerry]

So, some of you seem fairly familiar with this unit. Do any of you
have info on what resistance or voltage I should see on/across zone 1?
Thanks, Gerry

 

[Jim Rojas]

Open Circuit = 3.7 - 5.0 volts
Normal = 2.0 - 3.0 Volts
Short = 0.0 - 1.3 Volts

This is true on all zones.

Jim Rojas

 

[X. Boschman]

Open Circuit = 3.7 - 5.0 volts
Normal = 2.0 - 3.0 Volts
Short = 0.0 - 1.3 Volts

Nope. Zone 1 uses a 1.8 ohm EOL resistor. It is optimized for a two wire
smoke loop and is the only "powered" protection loop on the panel. Open is
13.6 VDC, Normal is 12.35 VDC, and short is 3.9 VDC. This is the same spec
as loop B of a D6112.

The ranges you gave are for zones 2-6 only.

X. Boschman

 

[X. Boschman]

Open Circuit = 3.7 - 5.0 volts
Normal = 2.0 - 3.0 Volts
Short = 0.0 - 1.3 Volts

Nope. Zone 1 uses a 1.8 ohm EOL resistor. It is optimized for a two wire
smoke loop and is the only "powered" protection loop on the panel. Open is
13.6 VDC, Normal is 12.35 VDC, and short is 3.9 mVDC. This is the same spec
as loop B of a D6112.

The ranges you gave are for zones 2-6 only.

X. Boschman

 

[Jim Rojas]

I stand corrected...

Jim Rojas

Nope. Zone 1 uses a 1.8 ohm EOL resistor. It is optimized for a two wire
smoke loop and is the only "powered" protection loop on the panel. Open is
13.6 VDC, Normal is 12.35 VDC, and short is 3.9 VDC. This is the same spec
as loop B of a D6112.

The ranges you gave are for zones 2-6 only.

X. Boschman

 

[JLevine10]

8112 CPU Fail Message

Hi All -

I have a Radionics 8112 system that is displaying the message "Service CPU Fail". Any idea what could be causing this fault and possible remedies?

Many thanks!