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Author Topic: Dyson dc24 brush bar motor failure or pcb?  (Read 3798 times)

Offline loclann

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Dyson dc24 brush bar motor failure or pcb?
« on: September 27, 2014, 11:29:30 PM »
Hi folks, I have a dc24 which is out of warranty. Recently the brush bar ceased spinning. I have followed the instructions from the forum on pressing the reset button which I did but to no avail.
I then followed a thread about how to remove both the pcb and motor from the head unit and check the motor with a multimeter to find out if its at fault or not. To this end I purchased a multimeter and performed a voltage check on the motor itself while the unit was powered up and got an average reading of 240v which slowly went down to zero after the unit was powered off. What I'd like to know is; what does this mean? Is the motor faulty or working or does the fact that I can get a voltage reading from it mean that the motor is working so the pcb must be at fault  or is there another answer? Really hoping that someone can help - for as great as the dc24 is for my needs - it is impotent without the rotating brush bar. Loclann

Offline macman

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Re: Dyson dc24 brush bar motor failure or pcb?
« Reply #1 on: September 28, 2014, 10:10:31 AM »
If you are getting a reading c. 300V from the PCB output terminals then the PCB is OK, and so it must be the brushbar motor.
See this thread:
https://manchestervacs.co.uk/DysonForum/index.php/topic,1420.0.html

Online MVacs

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Re: Dyson dc24 brush bar motor failure or pcb?
« Reply #2 on: September 28, 2014, 11:29:58 AM »
Can I be clear what two points you were testing to get a 240v reading please?

Offline loclann

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Re: Dyson dc24 brush bar motor failure or pcb?
« Reply #3 on: September 28, 2014, 01:20:31 PM »
Hi Mvacs. I ask for your forgiveness in advance as i am not a trained professional and thus might not know the right terminology/. The two points across which i measured the 240v are the two brass like nodes slightly protruding from the barrel of the motor. I hope this helps. Loclann


Offline loclann

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Re: Dyson dc24 brush bar motor failure or pcb?
« Reply #4 on: September 28, 2014, 03:29:43 PM »
Hi Macman,

Today I measured 317v in two places; across the two brass looking nodes on the motor and on the two hard wires coming out of the brown cylindrical component on the pcb. Is it correct to assume that power was flowing through the pcb to the motor and the fact that it wasn't spinning indicates that the motor has blown/is broken and that the pcb was okay?

Online MVacs

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Re: Dyson dc24 brush bar motor failure or pcb?
« Reply #5 on: September 28, 2014, 11:13:11 PM »
You would be looking for initially *around* 330v DC coming from the PCB to the motor, which you seem to have (317 is close enough).

Based on what you told us, as Macman also said, your motor is getting power to it, so as with most, you want this motor: DF651(2)LG Johnson Motor for Dyson DC24.


 

 

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