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Sensortron troubles -

Etowah

bigjws

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I need some help from hopefully Dan if he's checking the forums or one of you other electronics wizards..

One of my bays has a Sensortron that is rejecting all quarters. I've swapped out to a new sensortron, same thing. I swapped one from another bay and it does the same thing, and then put the 'bad' one in another bay and it works fine...so it's definitely a problem within the bay. It's acting as if it's not getting any power - but I've checked the power actually coming into the sensortron (the little yellow and black wires) and it's showing the same 25/26 amps as the other bays, so the power is getting to the acceptor. I also have a Dixmor dx300 that it connects to, but that is working just fine. Is there something else besides a power loss that can cause a sensortron to reject everything? Would it maybe be that I can get 24 amps when testing, but under load it's losing power (I just realized I only tested the incoming power when it was disconnected from the sensortron)?
 

mac

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Good question. First you are actually measuring 24 volts of alternating electricity. It it was pulling 24 amps you would see a small cloud of smoke. We know it's not the acceptor. I would start by disconnecting the timer from it and see if it works then. Let us know what you find.
 

1carwash1

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Check the yellow and black wire connections. A high resistance contact can cause a voltage drop under load. If you can, measure the voltage while the Sensortron is connected.
 

bigjws

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Got it working .. changed out the two power wires from the terminal block that wire nut to the yellow and black wires of the sensortron and it’s working. I assume they must’ve been like 1carwash1 mentioned and were dropping the voltage...were definitely old wires.

And yes.. 24vac not 24 amps 😉
 

mac

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Thanks for letting us know what caused it. A bad wire, especially on a low amperage device, is usually the last thing you suspect.
 

Dan kamsickas

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Got it working .. changed out the two power wires from the terminal block that wire nut to the yellow and black wires of the sensortron and it’s working. I assume they must’ve been like 1carwash1 mentioned and were dropping the voltage...were definitely old wires.

And yes.. 24vac not 24 amps 😉
I was off last week but am glad you found it. Old wiring is something I fight daily.
 
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