Roomba 870 side brush not spinning

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Roomba 870 side brush not spinning

Postby Nemesis » May 28th, 2017, 6:15 pm

Hi Everyone,

I have a two year old Roomba 870 and the side brush stopped spinning.
There's no dirt or debris, so I ordered a new side brush motor module and assembled it.
It's still not spinning. The spring contacts are intact.
Anyone has any idea about a possible solution?

I suppose it's probably the mainboard but I wonder if anyone has any idea.

Thanks,
Nemesis
 
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Re: Roomba 870 side brush not spinning

Postby a1robotrepair » May 28th, 2017, 7:01 pm

Check connection from Q57, PNP, and Q64, NPN TRANSISTORS collectors to top spring solder connections.
... Q74...Q58...bottom spring.
Q57 & Q74 emitters to VBAT
Q64 & Q58...SysRtn...GND
Roses are red Violets are blue Poems are hard Flowers and Chocolate
http://www.daycounter.com/Calculators/
a1robotrepair
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Re: Roomba 870 side brush not spinning

Postby przemo33 » January 10th, 2018, 4:24 am

Hello,
I also have a problem with a side brush in Roomba 870

"Q57, PNP, and Q64, NPN TRANSISTORS collectors to top spring solder connections.
... Q74...Q58...bottom spring.
Q57 & Q74 emitters to VBAT
Q64 & Q58...SysRtn...GND" -> ALL its OK


But I noticed that there is no signal to switch to Q74 in the Base.
Do you know which elements should change the Base (Q74)?

Regards
Attachments
side brush S800.jpg
Side brush S700/800
przemo33
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Re: Roomba 870 side brush not spinning

Postby przemo33 » January 13th, 2018, 6:35 am

Hello,
Measurement (V to GND):
A good main plate in green
The wrong main plate is red

The biggest differences around the Q100

Regards
Attachments
side brush r700 _napiecia.jpg
measurment
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