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Author Topic: DC15 PCB or Brush Motor at fault?  (Read 3653 times)

Offline dickylad

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DC15 PCB or Brush Motor at fault?
« on: January 09, 2015, 12:14:57 AM »
Hi,
     I have a DC15 which is not spinning the brush bar. It does for an instant then stops. I have checked the voltage at the PCB to the motor, it is 320V DC which seems to be correct, this is with the motor disconnected. This is the same value at the crimps for the motor, with the motor disconnected. The voltage is constant and can be switched off by operating the brush on/off control. With the motor connected the motor pulses and stops, it does this each time the on/off button is pressed. The resistance of the motor is 60 ohms. Anybody else had similar symptoms? Was it the PCB or motor at fault? I suspect it is the motor, there is no heat damage to the PCB, thanks for reading,

Regards,

Dickylad

Online Madrat

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Re: DC15 PCB or Brush Motor at fault?
« Reply #1 on: January 09, 2015, 12:28:33 AM »
Hi  :tiphat:

If the voltage is constant I would say the motor is at fault.

Offline dickylad

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Re: DC15 PCB or Brush Motor at fault?
« Reply #2 on: January 09, 2015, 12:32:59 AM »
Hi,
    the voltage is only constant with the motor disconnected. With the motor connected it just pulses for an instant and then no voltage. I can't decide which it is, my gut says motor.

Regards

Online Madrat

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Re: DC15 PCB or Brush Motor at fault?
« Reply #3 on: January 09, 2015, 12:37:45 AM »
Hmm I would agree, but there are more knowledgeable people on here than me that can confirm it.

Online beko1987

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Re: DC15 PCB or Brush Motor at fault?
« Reply #4 on: January 09, 2015, 01:00:38 AM »
Sounds like the motor draws incorrect current (suggesting borked commutor), if the voltage is fine without it connected.

I agree with Mad though, wait for someone with actual real experience to weigh in, not us armchair experts!

I have a DC25 in at the minute with a pulsing and sparky brushroll motor, but looking at the DC15 parts prices are way different! Motor for the 25 is 50, PCB is 5 so I recommended both to the customer just to rule everything out. At 40 for the PCB and 40 for the motor I'd wait for proper diagnosis instructions before splashing the cash! (And those are mvacs prices, which will be the cheapest you will find short of second hand unknown stuff from ebay)
Collector and restorer of vintage vacuums, Dyson Appreciator! Come and see my blog, where I am uploading all my mountains of brochures, manuals and other vacuum cleaner paperwork, and also my youtube channel @beko1987!

Online MVacs

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Re: DC15 PCB or Brush Motor at fault?
« Reply #5 on: January 09, 2015, 10:59:37 AM »
From what you have wrote Dicky, I am suspecting the motor if the PCB isn't burned. However, sometimes the loom breaks up on DC15's also giving the symptoms you describe.

We might have a used 15 motor if you want to keep cost down if you get in touch.

For Beko, after-market 25 motors are on the way and will be on the market soon. But now, as you say, they are really expensive, and only we do them on their own. Sometimes a cleaner head is a better bet.

Edit: The 25 ones came in stock today.

Offline dickylad

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Re: DC15 PCB or Brush Motor at fault?
« Reply #6 on: January 10, 2015, 06:11:14 PM »
Thanks for all the replies, I have checked the voltage at the end of the terminal which connect onto the motor (with the motor disconnected) and the voltage was good, so I assume the loom to be ok. I have done some more testing on the motor and found that the resistance alters when the brush bar is turned, and sometimes it is a dead short. I suspect that the motor is at fault and the PCB is just doing its job i.e. stopping the voltage on detection of a high current. So the motor runs until it reaches a part where there is a short, a high current flows due to the low resistance, the PCB sees the high current and then stops the voltage to the motor. All this takes time and hence the pulsing behaviour of the motor is explained. A new motor assembly I think. Thanks for all the comments again,

Regards,

Dickylad

Offline dickylad

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Re: DC15 PCB or Brush Motor at fault?
« Reply #7 on: January 21, 2015, 11:05:27 PM »
Hi all,
         just thought I would let you know that the motor was indeed at fault and the brush bar is now working a treat. Hopefully this may help someone in the same situation in the future,

Regards,

Dickylad

Online beko1987

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Re: DC15 PCB or Brush Motor at fault?
« Reply #8 on: January 21, 2015, 11:14:57 PM »
Good to hear, glad you fixed it!
Collector and restorer of vintage vacuums, Dyson Appreciator! Come and see my blog, where I am uploading all my mountains of brochures, manuals and other vacuum cleaner paperwork, and also my youtube channel @beko1987!

Online Madrat

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Re: DC15 PCB or Brush Motor at fault?
« Reply #9 on: January 21, 2015, 11:32:15 PM »
 :thumbsup:

Online MVacs

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Re: DC15 PCB or Brush Motor at fault?
« Reply #10 on: January 22, 2015, 12:23:36 AM »
Hi all,
         just thought I would let you know that the motor was indeed at fault and the brush bar is now working a treat. Hopefully this may help someone in the same situation in the future,

Regards,

Dickylad

Hey, we are not bad with our distance diagnosis's here.  :thumbsup:

Thanks for the update Dicky.


 

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