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Car alarm siren issue
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slybunda:
some trace damage too looks like a single layer board so not sure now.
tom66:
The Jxxx numbering next to the suspect damaged resistors suggests they are jumpers.

I'd check the transistors next door were not thermally damaged, that board looks like it got toasty!
slybunda:
zener diode is bust, not sure where to go with that, the 2 resistors although black seem to both be giving a resistance of 102 ohm and 101.5 ohm, so they could be 100 ohm resistors. all resistors marked with a Jxx measure at 0 ohms so they just jumpers i guess.
slybunda:

--- Quote from: tom66 on February 05, 2024, 11:07:57 am ---The Jxxx numbering next to the suspect damaged resistors suggests they are jumpers.

I'd check the transistors next door were not thermally damaged, that board looks like it got toasty!

--- End quote ---

The other 2 transistors seem to test ok without removing them.
slybunda:
anyone know if the zener diode thats broken is part of the circuit thats responsible for charging the internal 7.2v battery? if so i can probably leave that part out of the circuit since i dont intend to put a battery back in it.
the other side where the traces have gone is the tricky part but its not micro soldering and has space to work around so may be able to just use wires to connect parts back up?
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