Internal speedometer hall sensor broken

[LithiumFan]

After some intensive testing I think the internal speed hall sensor on the pcb in the motor has broken. It is soldered to Q4 on the pcb on attached photo. It is about 25mm long and has number 1924228 on it. I'm happy to replace it as I really don't want to attach an external speed sensor with even more wiring. It broke off when I replaced the motor cable and after re-soldering on the pcb it wasn't working. After looking at various threads I realise that speed only shows on the display with signals from the other thre hall sensors.

Does anyone know where I could get a replacement as I have no idea what its specifications are.
Thanks

 

[saneagle]

After some intensive testing I think the internal speed hall sensor on the pcb in the motor has broken. It is soldered to Q4 on the pcb on attached photo. It is about 25mm long and has number 1924228 on it. I'm happy to replace it as I really don't want to attach an external speed sensor with even more wiring. It broke off when I replaced the motor cable and after re-soldering on the pcb it wasn't working. After looking at various threads I realise that speed only shows on the display with signals from the other thre hall sensors.

Does anyone know where I could get a replacement as I have no idea what its specifications are.
Thanks

It will be a standard SS41 5v bipolar hall sensor. You can get them anywhere for a few pence.:

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Are you sure it's not working? Often, you need a pull-up or pull-down resistor to test their function. If there's no resistor on a PCB in the motor, then it's in the controller, so if you test it not connected to and not powered by the controller, it won't work.

 

[LithiumFan]

Now I'm not sure. Bonnie gave me instructions as how the check all the hall sensors using the diode setting on my multimeter. So with the battery connected but the display turned off I tested the following and got results:

MM red probe into red 5v pin then green, blue, yellow and white (speed wire) in turn returns 1.55v each time.

MM red probe into black gnd pin and green, blue, yellow and white in turn return 0.63v

So this should indicate that it is working.

The only other thing I can think is that I have 12 magnets on the PAS but with a 10 magnet sensor. Hence with C1 setting at 03.

I have not connected the throttle and have P4=1 and C4=0.

The speedometer on the display shows speed only up to 15.5mph (my set limit) when using assist then slowly reverts to 0 if I stop pedalling. I understood from other threads that this means the speed is only being registered via the other hall sensors in the motor.

 

[saneagle]

Now I'm not sure. Bonnie gave me instructions as how the check all the hall sensors using the diode setting on my multimeter. So with the battery connected but the display turned off I tested the following and got results:

MM red probe into red 5v pin then green, blue, yellow and white (speed wire) in turn returns 1.55v each time.

MM red probe into black gnd pin and green, blue, yellow and white in turn return 0.63v

So this should indicate that it is working.

The only other thing I can think is that I have 12 magnets on the PAS but with a 10 magnet sensor. Hence with C1 setting at 03.

I have not connected the throttle and have P4=1 and C4=0.

The speedometer on the display shows speed only up to 15.5mph (my set limit) when using assist then slowly reverts to 0 if I stop pedalling. I understood from other threads that this means the speed is only being registered via the other hall sensors in the motor.

That happens when you set the number of magnets in the speed sensor to zero. You should have P2=1, assuming that there is one magnet stuck to the inside of the hub. It's nothing to do with P4 nor C4. They're for how the pedal assist a d throttle work. You should set p4=1 and C4=3 if you want a legal throttle. You can also get the speed display to behave like that if the magnet becomes unstuck from the hub.

 

[LithiumFan]

P2 is set to 1.

If the hall is working could there be problem with the magnet? I didn't see anything that looked like one. I think I'm going to have to open up the motor again and have a good look.