Roomba 560 with blown h-bridge.

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Roomba 560 with blown h-bridge.

Postby J0nt383 » October 28th, 2018, 2:26 pm

So... got this used 560, bought a replacemnet battery, all fine. Pushing clean and it starts to move fwd, then poof... the never missleading sound of semicondutor explotion. Turns out that 2 of the nec power transistors have failed, fatal. Changed theese, and everyting seems okay, but the wheel just wont spin... this is the left side wheel motor h bridge. Mb is r3. I belive this is beyond h bridge, just woundering if anyone can point me in a direction here, not familiar whit the circuits here, and cannot find a full schema for left side.... hopefully someone has an idea //j
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Re: Roomba 560 with blown h-bridge.

Postby vic7767 » October 28th, 2018, 10:53 pm

Head over to this thread by Gordon for some valuable info about your H-Bridge:

viewtopic.php?p=112075#p112075
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Re: Roomba 560 with blown h-bridge.

Postby J0nt383 » October 29th, 2018, 3:07 am

Hi! Thank you. This explains a whole lot. Kind of complex drive circuit, many places to fail, hbridge have voltage and ground as pinned out by as1robotrepair. You guys who probably poked around units like these before, any hint is much apriciated. Seems like the hbridge is active but not "enabled", so i guess i need to follow back, finding where it fails. This based on that it really does not give any error at first, just spins around and the fails saying "check right wheel" and seen from above right wheel, brush, mainbrush and vac goes as they should.
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