Roomba 560 only drive in small circles!

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Roomba 560 only drive in small circles!

Postby mbk » September 10th, 2010, 10:20 am

My Roomba 560 is only able to drive around i small circles, when I start it.

It is like that the left wheel is not turning at all. I can make the circles borh clockwise and counter clockwise.

I have tried to reset the Roomba by remove the battery and hold the "ON" button down for 10 seconds.

What else can I try? Or do I have to buy a new one?

Regards
Michael K
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Re: Roomba 560 only drive in small circles!

Postby mfortuna » September 10th, 2010, 10:44 am

Look at the read me first sticky and find the service manual for the 500 series. Then you can learn how to run diagnostics and see how the wheels behave. Did you try turning the wheels by hand to see if there is a difference in resistance?
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Re: Roomba 560 only drive in small circles!

Postby mbk » September 11th, 2010, 6:44 am

I have tried to do this:

1. Verify that the Clean LED is Off
2. Press and Hold both the Dock and Clean Buttons.
3. Press the Spot Button 6 times
4. Release the Dock and Clean Buttons

What shall I do after that for testing the wheels?

The two wheels have the same resistance. I am able to turn both wheels with the same amount of force.

Regards
Michael

mfortuna wrote:Look at the read me first sticky and find the service manual for the 500 series. Then you can learn how to run diagnostics and see how the wheels behave. Did you try turning the wheels by hand to see if there is a difference in resistance?
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Re: Roomba 560 only drive in small circles!

Postby poconogal » September 11th, 2010, 6:47 am

Several months ago I purchased a used 560 on Ebay. When it arrived and I turned it on, it ran in circles, but the seller said it did not do this when she sold it. I believed her, but this particular Roomba, when I purchased it, was already a few years old. Anyway, while it was running in circles, my husband gave it a push, and made it go straight. It began running straight, and hasn't done circles at all since then. For some reason this push worked. Not a technical solution, I know, but it did the trick. :lol:
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Re: Roomba 560 only drive in small circles!

Postby mbk » September 11th, 2010, 7:12 am

Hi

I have tried to push my Roomba, but without any luck.

Regards
Michael
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Re: Roomba 560 only drive in small circles!

Postby poconogal » September 11th, 2010, 8:45 am

Oh well, I guess your's won't be pushed around, LOL! Too bad... Now the more knowledgeable and technical guys must chime in, like Mike (again) and the other greats... In the meantime, you can do as Mike suggested, and "look at the READ FIRST sticky and find the service manual for the 500 series. Then you can learn how to run diagnostics and see how the wheels behave."
Connie

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Re: Roomba 560 only drive in small circles!

Postby mfortuna » September 11th, 2010, 8:54 am

It sounds like you got into diag mode. Read further in the manual and look for how to advance to the wheel test. If the wheel is not turning at all it could be a bad motor or connection.
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Re: Roomba 560 only drive in small circles!

Postby mbk » September 11th, 2010, 12:14 pm

mfortuna wrote:It sounds like you got into diag mode. Read further in the manual and look for how to advance to the wheel test. If the wheel is not turning at all it could be a bad motor or connection.


All sensor test was OK
Wheel drop test was OK
But only right wheel was turning in test. The left wheel was not turning at all.

How do I find out if motor is defect, a bad connection or error in the Roomba computer?

Is it possible to buy a new wheel with motor?

Regards
Michael
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Re: Roomba 560 only drive in small circles!

Postby TechGuy » September 11th, 2010, 12:39 pm

You can order a whole wheel assembly from iRobot. Register you Roomba at iRobot and get 15% off on your order. http://store.irobot.com/search/index.js ... heels&sr=1

You can buy them on eBay too.
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Re: Roomba 560 only drive in small circles!

Postby mbk » September 11th, 2010, 12:58 pm

Irobot does not ship to Denmark (where I am). Anyone knows a webshop inside the EU, that sells sparepart to Roomba (and ship to Denmark) ?
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Re: Roomba 560 only drive in small circles!

Postby vic7767 » September 11th, 2010, 1:10 pm

Try removing the left wheel, use a battery source like a 9 volt battery and connect to the motor. If the motor runs in one direction then reverse the leads and make sure the motor will run in the opposite direction. If the motor works then you may have a defective transistor on the drive motor H bridge on the PCB.
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Re: Roomba 560 only drive in small circles!

Postby mbk » September 11th, 2010, 1:14 pm

vic7767 wrote:Try removing the left wheel, use a battery source like a 9 volt battery and connect to the motor.


The connection have 10 pin connection. Which pins should attach to the 9 volt battery to?

Regards
Michael
Last edited by mbk on September 11th, 2010, 3:55 pm, edited 1 time in total.
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Re: Roomba 560 only drive in small circles!

Postby sageman » September 11th, 2010, 1:22 pm

put the contacs on the pcb which is attached to the motor
400/disco disassembly's (everything down to the PCB)
http://www.robotreviews.com/wiki/400disco-disassembly

one day many years from now a person will say "right I'll just ROOMBA downstairs" instead of hoover
oh wait I already do :)

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Re: Roomba 560 only drive in small circles!

Postby mbk » September 11th, 2010, 1:31 pm

sageman wrote:put the contacs on the pcb which is attached to the motor


The pcb?

Regards
Michael
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Re: Roomba 560 only drive in small circles!

Postby vic7767 » September 11th, 2010, 2:04 pm

There are two leads (Red and Black) that connect to the motor to operate it. Find those two colors on the Paddle board connector that plugs into the connector on the motherboard (PCB),
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Re: Roomba 560 only drive in small circles!

Postby mbk » September 11th, 2010, 3:38 pm

vic7767 wrote:There are two leads (Red and Black) that connect to the motor to operate it. Find those two colors on the Paddle board connector that plugs into the connector on the motherboard (PCB),


I have found the red and black wire, that goes to the motor. And then I put 9 volt from a battery, then motor turns. There goes 3 more wires to the motor (2 white and a green). What is the other 3 wires for?


Sow maybe the error is not in the wheel ?
What can I do to further look for the error?
Or do I have to buy a new wheel (with motor and connection) and hope that is the solution?

Regards
Michael
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Re: Roomba 560 only drive in small circles!

Postby sageman » September 11th, 2010, 4:02 pm

have you reverced the polarity to make the motor turn the outher way

the outher wires (4) are for the micro switch (wheel drop sensor) and an odemeter
400/disco disassembly's (everything down to the PCB)
http://www.robotreviews.com/wiki/400disco-disassembly

one day many years from now a person will say "right I'll just ROOMBA downstairs" instead of hoover
oh wait I already do :)

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to sell (one day): roomba sage and silver (both 400's)
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Re: Roomba 560 only drive in small circles!

Postby mbk » September 11th, 2010, 4:11 pm

sageman wrote:have you reverced the polarity to make the motor turn the outher way

the outher wires (4) are for the micro switch (wheel drop sensor) and an odemeter


Yes. Then I reverce the polarity, the wheel is turning the other way around.

Regards
Michael
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Re: Roomba 560 only drive in small circles!

Postby vic7767 » September 11th, 2010, 4:17 pm

It would appear that you have a good drive motor but have a defective H bridge transistor/diode component. Try doing a search for H bridge and do a bit of reading.
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Re: Roomba 560 only drive in small circles!

Postby mbk » September 11th, 2010, 5:23 pm

vic7767 wrote:It would appear that you have a good drive motor but have a defective H bridge transistor/diode component. Try doing a search for H bridge and do a bit of reading.


I attach the wheel again in to the Roomba, and connected the battery and run the test program.

Now the left wheel is able to turn, but only when the wheel is in free air. When I put the wheel on the floor, it just says a noise from the motor, but the wheel is not turning.

Then I do the same with the right wheel, it is able to turn both in free air and on the floor.

Regards
Michael
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