Roomba 520/5xx Model - Side brush not spinning -

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Roomba 520/5xx Model - Side brush not spinning -

Postby fortrash » June 5th, 2016, 1:48 pm

Hello,

can you please give me any hints what is wrong with my Roomba 520? The side brush does not longer spin. It works fine, when it is connected with an adjustable power supply. The continuity checks via multimeter works and no broken connection seems to be the error. My guess is that s.th. with the other electronic components (transistor?) is wrong. The capacitors on the board also look fine.
I have here further electronc measuring equipments (oscilloscopes/multimeter). Any ideas?

Sorry If the terms for the electronic components/devices are wrong, english is not my native language.

See pictures below for further illustrations.


thanks a lot for any help,

IMG_20160605_183959633.jpg
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Re: Roomba 520/5xx Model - Side brush not spinning -

Postby vic7767 » June 5th, 2016, 2:21 pm

Just to the right of the two side brush motor spring contacts are 4 diodes and 4 transistors that form the H--bridge control for the anti-tangle feature on your 520 side brush. It's very possible that one of those transistors is defective.
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Re: Roomba 520/5xx Model - Side brush not spinning -

Postby fortrash » July 13th, 2016, 1:49 pm

Thanks!
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Re: Roomba 520/5xx Model - Side brush not spinning -

Postby digira » June 15th, 2019, 2:13 pm

My Roomba is a 561 model. (Main Board R3 PCB)

The side brush didn't spin. The motor was ok, (you can probe it with 12VCC).
The problem was ; 2 transistor KO and R118 opened.

I changed the four transistors and R118 and the problem was solved.

I used two BC337 for changing S8050 NPN transistors.
and two BC 327 for changing S8550 PNP transistors.

NOTE: I have used the schema of the wheel control, drawing some components to adequate to reality and deleting resistors, capacitors, ... numbers of no valid components.
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SIDE BRUSH.jpg
SIDE BRUSH.jpg (60.5 KiB) Viewed 655 times
R118_561.jpg
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