Pacemaster Optical Sensor Assembly with Wiring Harness Part Number DBBOSA/APPOSA

PaceMaster made the first commercial treadmill back in the 1960s. By the time I bought one in 2003 the company was apparently on its last legs, and PaceMaster has since stopped making treadmills. But the quality of its product was solid in 2003, and we used our PaceMaster ProElite regularly without any issues until we moved to another state in 2019. When we hooked up the machine and turned it on in our new residence, it quickly accelerated to its maximum speed and then beeped and shut off.Some professional advice on the web says this is likely because of a short on the motor controller circuitboard. The bad news is that replacement motor controller circuitboards for PaceMasters are difficult to find and can be expensive if you do find a used one.The good news is that immediate start-up acceleration like that of our treadmill can also be caused by a defective optical sensor, which gives the treadmill computer the feedback it needs to control speed. And that was indeed the case with our machine. I was skeptical when I ordered this product, but after replacing the defective sensor with the new one, the treadmill immediately started working correctly. Whew!The sensor is held in place tightly by a machine screw that taps its own threads into the plastic housing of the sensor. For this reason I recommend getting a sensor that is not used or refurbished, even though it may cost somewhat more. A loose sensor is an unreliable sensor, and who knows how many times threads have been cut and recut in a used plastic housing.Replacing the part is likely within the skillset of anyone who has installed DIMMS or drives or firmware cards inside a desktop PC, but I wouldn't recommend DIY for someone new to electronics. If you're such a person and are inclined to try DIY anyway, remember never to make electronic repairs on a machine that is plugged in!

Item was returned as I decided to replace the treadmill instead of attempting to repair it. The sensor was dimensionally identical to the original although I did not have a change to try it functionally.

I was receive item .

The part worked as advertised

My BodyGuard Magellan Plus started suffering "speed errors" and even though I was told the optical sensors rarely if ever fail, my experiments trying to prove the wire harness was the culprit ultimately pointed towards the sensor. BodyGuard no longer had a wire harnesses for the Magellan Plus, so I now needed a new wire harness and a sensor. I was hoping the Pacemaster's wire "connector" , to the motor controller board, would be the same as the OEM part. But, if it wasn't I felt confident that I could substitute the OEM plastic connector if need be.As it turned out, everything fit perfectly (almost) as if they were all OEM BodyGuard parts. The only thing I had to do was swap the "red/black" wire connector positions that connected to the motor control board. So far, all seems to be okay at this point, though I won't know for sure until I use it for a while. My "speed errors" would usually disappear for a while following "any" successful attempt to get them to stop. Time will tell if it was the sensor/harness or if the MCB is the "speed error" source. So, for anyone needing a speed sensor and/or wire harness for their BodyGuard treadmill, these two parts work great!