Reed switch theory
Bear with me here:
I’ve a vintage cyclometer on my vintage road bicycle (Cat Eye Micro CC-6000, and Bob Jackson Super Tourist respectively, not that it matters). The cadence has stopped registering and via diagnostics with a magnet and various jumper wires, it appears the issue is the wired pickup sensor that senses a magnet on the crank (and, no it’s not just a placement issue).
The question before I invade the sealed sensor: I’m assuming the sensor is a simple magnetic triggered reed switch, but with only one small-gauge wire leading to it (and no connection to ground at the sensor) what signal and how is said signal sent to head unit? I’d think if the switch closes (or opens) a circuit there’d have to be two wires. There is no battery in the sensor.
I’m sure it’s something simple - the thing’s 30+ years old (a Second World Problem?)
I’m thinking I might could just replace with a generic reed switch but the circuitry confounds me (in its simplicity). Cat Eye support of no help - just want to sell me a new wireless model.
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