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Not this. The threshold for low/hi stays the same for U031 & the machine function, always. But the individual sensor output can vary widely.
That. The defective sensor does not always reach the threshold the controller needs to see, and it can be very intermittent. So an output of 3.55vdc hi would indicate to you that it's way too low, and very likely in the process of failing. Really, anything less than 4.75vdc hi is suspect.
This was common on a lot of the older Toshibas, but fairly rare on Kyoceras. The 5.0vdc tends to drop off with age (10+ yrs). Weird unexplained document feeder jamming can be caused by that 5.0vdc supply voltage edging toward 4.85-4.90vdc. On those older Toshibas it was possible to find the VR on the power supply that adjusts the 5.0vdc supply output, and adjusting it to 5.03vdc. The most fortuitous result was finding that the VR had corroded in that one contact area, and just turning it back & forth a few times scrapes away the corrosion. The other possibility is gradual failure of the power supply, and compensating could buy you a little time. If you had to come back a second time for the exact same issue it usually meant that the power supply had sagged further. It was easiest to access the 5vdc supply voltage on the document feeder connector at the document feeder controller.
I have never diagnosed a Kyocera for this issue, but I imagine that it's certainly possible. =^..^=
Understood. I just found your sensor problem interesting.
Adversity temporarily visits a strong man but stays with the weak for a lifetime.
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