Suicide attempt

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Suicide attempt

Postby Nitrowing » August 24th, 2010, 1:42 pm

After getting my 4XXX battery charged, I let it rip in the bedroom. 50 minutes later, a large crash and 'Uh-oh' emanated from the the upstairs landing.
She's chucked herself down 4 carpeted stairs.

Now the left wheel wont power. It turns by hand, I've pulled it apart to check if crud had dis-lodged itself and all looks fine.

This is so dis-heartening after messing around buying batteries, swapping them over (to find the charging circuit had failed) etc :oops:

I've checked the www.repaircare.co.uk and it gives a quick quote of £93 but doesn't elaborate on what they'll do - fix the charging circuit + wheel??

Is there anyone else that I could speak to? Is it a DIY job?
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Re: Suicide attempt

Postby vic7767 » August 24th, 2010, 3:02 pm

Try connecting a 9 volt battery to the motor leads and see if the motor will run.
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Re: Suicide attempt

Postby mfortuna » August 24th, 2010, 3:52 pm

It could be something as simple as a loose connector or a broken wire. Since you have to take the shell off to test it like vic mentioned maybe you will find something. If the motor tests good then replacing the controller board to fix the motor and charging circuit could be a good DIY project.
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Re: Suicide attempt

Postby Nitrowing » August 24th, 2010, 3:56 pm

I found a screw in the open slot of the motor casing :(
9V test failed. It made the wheel unable to turn in one direction which reversed when I changed 9V polarity.
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Re: Suicide attempt

Postby mfortuna » August 24th, 2010, 5:10 pm

Nitrowing wrote:I found a screw in the open slot of the motor casing :(
9V test failed. It made the wheel unable to turn in one direction which reversed when I changed 9V polarity.

Not sure what you mean? The motor turned in both directions or didn't turn at all?
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Re: Suicide attempt

Postby Nitrowing » August 24th, 2010, 5:32 pm

mfortuna wrote:
Nitrowing wrote:I found a screw in the open slot of the motor casing :(
9V test failed. It made the wheel unable to turn in one direction which reversed when I changed 9V polarity.

Not sure what you mean? The motor turned in both directions or didn't turn at all?


The motor spins freely with no power attached.
Applying voltage would allow me to physically move the rotor in it's correct direction but not against.
The motor will not spin by just applying power.

Can I buy a replacement motor/unit in the UK?
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Re: Suicide attempt

Postby TechGuy » August 24th, 2010, 6:25 pm

Nitrowing wrote:The motor spins freely with no power attached.
Applying voltage would allow me to physically move the rotor in it's correct direction but not against.
The motor will not spin by just applying power.

Can I buy a replacement motor/unit in the UK?

Is the motor turn the other direction if you switch the polarity of the voltage applied to the motor? It should.
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Re: Suicide attempt

Postby Nitrowing » August 24th, 2010, 6:51 pm

TechGuy wrote:
Nitrowing wrote:The motor spins freely with no power attached.
Applying voltage would allow me to physically move the rotor in it's correct direction but not against.
The motor will not spin by just applying power.

Can I buy a replacement motor/unit in the UK?

Is the motor turn the other direction if you switch the polarity of the voltage applied to the motor? It should.


It would but only if I moved it by hand. The polarity switching works but the motor wont spin. The test was done with the drive belt removed to ensure wheel gearing didn't affect the test.
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Re: Suicide attempt

Postby sageman » August 24th, 2010, 7:17 pm

hav you tryed both ways by hand
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: Suicide attempt

Postby Nitrowing » August 24th, 2010, 7:23 pm

sageman wrote:hav you tryed both ways by hand


Yes. The motor resists in the opposite way depending on the battery polarity.

Where can I get a new one?
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Re: Suicide attempt

Postby vic7767 » August 24th, 2010, 7:57 pm

You can get a replacement here: www.ProTechRobotics.com
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Roomba LIVES!!!

Postby Nitrowing » September 7th, 2010, 6:06 pm

I bought an old 1st gen Roomba on evilbay (spares or repairs) which arrived today.

Stripped the Gen1 and forced the motor out of the wheel housing. Swapped the yellow & red wires over from the connectors and rebuilt the Gen2 wheel with it. I needed to snip the excess circuit board to stop the wires rubbing on the Roomba housing and rebuilt it.
Total time = 2 hours. Mainly trying to figure out how to strip the Gen1

Do-do-de dooot!! Off it whirred!! :cheers:

Are there any parts in the Gen1 that I should keep for spares?
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Re: Roomba LIVES!!!

Postby TechGuy » September 7th, 2010, 7:20 pm

Nitrowing wrote:I bought an old 1st gen Roomba on evilbay (spares or repairs) which arrived today.

Stripped the Gen1 and forced the motor out of the wheel housing. Swapped the yellow & red wires over from the connectors and rebuilt the Gen2 wheel with it. I needed to snip the excess circuit board to stop the wires rubbing on the Roomba housing and rebuilt it.
Total time = 2 hours. Mainly trying to figure out how to strip the Gen1

Do-do-de dooot!! Off it whirred!! :cheers:

Are there any parts in the Gen1 that I should keep for spares?


1. The bump sensor IRPT and IRLED for the 500 Series Roomba 9 beeps problem.
2. H-bridge transistors to repair drive wheel always on or off problem.
3. Wheel drop micro switches
4. Keep the wheels for the 400 series Roomba
5. The brush motor can be used in the 400 series Roomba with a bit of work. The gear is press fitted. One need to take it off and put the one from the 400 series brush motor.
6. Take the gears out from the gearbox. All gears, except the brush motor gear, can be used in the 400 series gear box. The brush motor gear can be easily modified to use in the 400 series gear box.
7. Keep the battery case to rebuild battery
8. If it comes with the external Rapid charger, you can sell it or use it.

Just keep the whole thing. You may find some use for it when you are not expected.
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Re: Roomba LIVES!!!

Postby Gordon » September 7th, 2010, 8:07 pm

Possible gottchas on two items:
TechGuy wrote:...
3. Wheel drop micro switches
4. Keep the wheels for the 400 series Roomba...
Item-3 switches might have different lever-arm orientations.
Item-4 wheels have loose tires on the 2XXX-3XXX Roomba, and tires bonded to the wheel rims on 4XXX.
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Re: Roomba LIVES!!!

Postby TechGuy » September 7th, 2010, 11:37 pm

Gordon wrote:Possible gottchas on two items:
TechGuy wrote:...
3. Wheel drop micro switches
4. Keep the wheels for the 400 series Roomba...
Item-3 switches might have different lever-arm orientations.
Item-4 wheels have loose tires on the 2XXX-3XXX Roomba, and tires bonded to the wheel rims on 4XXX.


Item 3: You may be right. I have not transplant one yet.

Item 4: The tires design may be different. But the whole wheel assembly can be installed in the 400 series Roomba without any modification. The length of the wires are shorter. But it fits.
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Re: Suicide attempt

Postby Nitrowing » September 8th, 2010, 5:21 pm

Thanks TechGuy :)

I haven't tried charging the battery that came with it but I still have the original cells that I swapped out (before I found that the charging circuit had failed) to fit in if the Gen1 battery wont charge up.
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Re: Suicide attempt

Postby TechGuy » September 8th, 2010, 7:35 pm

Nitrowing wrote:Thanks TechGuy :)

I haven't tried charging the battery that came with it but I still have the original cells that I swapped out (before I found that the charging circuit had failed) to fit in if the Gen1 battery wont charge up.


One more use of your Gen1 Roomba
If you have not fooled around with the Gen1 motherboard, you can use the Gen1 Roomba as the external charger for your 400 series battery. What a creative use of the old Gen1 Roomba!!!! I can hear members are checking eBay for a cheap Gen1 Roomba.

I am not sure which charging circuit failed - Your 400 series or Gen1 Roomba?
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Re: Suicide attempt

Postby Nitrowing » September 9th, 2010, 5:44 am

TechGuy wrote:you can use the Gen1 Roomba as the external charger for your 400 series battery. What a creative use of the old Gen1 Roomba!!!! I can hear members are checking eBay for a cheap Gen1 Roomba.

I am not sure which charging circuit failed - Your 400 series or Gen1 Roomba?

Fantastic!!! :mrgreen:
It was the 400 that wouldn't charge :D

**EDIT**
The green charging LED keeps going off. The battery is only at 16.5V - if I turn the power off at the wall off & on again the LED lights back up for a while (5 minutes) and then goes off again. The Gen1 Quick Start Guide states that it requires 12 hours to charge.

Is the LED turning off normal?

**EDIT 2**
It ran for 45 minutes before complaining of lack of power - I measure 14.96V
When I manually charged it (until the battery pack got warm) the battery output was 17.2V and ran for 2 hours.

As my upstairs has now been Roomba'd twice, I'm attempting to charge the battery that arrived in 'Savage' to see if it will run in 'Salvage'.
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