by dingo » Fri Aug 28, 2009 4:23 pm
There is a small disc shaped magnet bonded to the inner axle joint at the left hand side of the gearbox. The Hall effect transducer \ sensor that reads the manetic pulse as the axle rotates relies on the magnet being fairly close to the sensor as it passes by. Also, the polarity matters. The sensor will only work wih the magent in one polarity orientation, so don't flip it over. The sensor has a threaded body and a plastic lock nut on eaither side of the plate it rides in.
You can loosen one and then adjust how close \ far away from the magnet the sensor sits, then retighten the lock nuts nuts.
The sensor has to be close enough to measure a pulse as the magnet passes by, but not so close to hit it, make mechanical contact. When it's too far away, you'll see the intermittent reading your seeing. Or no reading at all.
An easy fix.
There is a small disc shaped magnet bonded to the inner axle joint at the left hand side of the gearbox. The Hall effect transducer \ sensor that reads the manetic pulse as the axle rotates relies on the magnet being fairly close to the sensor as it passes by. Also, the polarity matters. The sensor will only work wih the magent in one polarity orientation, so don't flip it over. The sensor has a threaded body and a plastic lock nut on eaither side of the plate it rides in.
You can loosen one and then adjust how close \ far away from the magnet the sensor sits, then retighten the lock nuts nuts.
The sensor has to be close enough to measure a pulse as the magnet passes by, but not so close to hit it, make mechanical contact. When it's too far away, you'll see the intermittent reading your seeing. Or no reading at all.
An easy fix.