Simplex Alarm issues

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Sat Jun 01, 2013 11:23 pm

KrankyBoy18 wrote:When I connect them to the strobe the strobe flashes. (As it should). But when I connect them to the horn the strobe flashes, but I don't hear anything from the horn.
Did you try both negative terminals? Can you make a video?
KrankyBoy18
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Tue Jun 04, 2013 10:39 am

I found the problem with the 4903..the horn was found to be inoperable
Noah, the Simplex nut
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Tue Jun 04, 2013 6:14 pm

That would explain the marker on it.
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Nathan
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Tue Jun 04, 2013 10:10 pm

yep the X ment it was a faulty horn/strobe.
Nathan H.


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Wed Jun 05, 2013 11:31 am

OKAY... Let me answer this since it seems like nobody knows about this signal.

1. The reason why the strobe flashes when you power the horn is because there are two jumper wires on the circuit board attached to the horn. Those are supposed to be cut if you intend to use the signal as a 4-wire signal.
IMG_0343.JPG
IMG_0343.JPG (544.91 KiB) Viewed 1414 times
2. You're using 3x 9v batteries as your power source? I wouldn't recommend that. The horn needs a lot more current due to the fact that it has an electromagnet. Are you sure your batteries are good? Test them on the 9838 horn I noticed you have. If that one sounds, then the mechanical horn on the 4903 is probably no good.

3. There's a tab on the horn that allows you to adjust the hammer. CAREFULLY flex it up or down while the horn is powered, you may be able to get it to sound.
IMG_0344.JPG
IMG_0344.JPG (627.8 KiB) Viewed 1414 times
If all of this fails, the horn probably no longer works.
For your information, you can see how the horn is supposed to work on my website:
http://thefirepanel.com/howwork/mhorns.php
Scroll down to the last diagram -- it is labeled as Type 3.
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KrankyBoy18
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Tue Jun 11, 2013 2:16 am

It's dead. But no worries. I recently purchased a 9215 from a seller known as jjinc24 that works like a charm. If I can I will post a video of it being tested. :wink:
Noah, the Simplex nut
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