scooba 390 charges but does not start up

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scooba 390 charges but does not start up

Postby robotbot » October 25th, 2013, 9:23 pm

Hey Guys

Long time lurker first post, My friend and I bought 2 scooba's from fishisfast (ebay) , They both stopped working around the same time. They charge , But when I disconnect the power and press clean / power on the scooba nothing happens no lights no nothing.

I think its not the battery because one of them died before the other one and I tried swapping the battery (from the then working scooba , into the one that dint respond) and it still dint work.

If I leave the scooba uncharged for a few weeks , it still goes into the refresh 16 hour power charging mode. Can you guys please help ? My house needs a mop :(

Thanks!
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Re: scooba 390 charges but does not start up

Postby vic7767 » October 25th, 2013, 9:53 pm

It's possible that debris has built up under the User Interface button contacts electrically insulating their function. You can attempt to disassemble the UI panel and clean the contact area or even purchase another UI part via ebay to replace the defective one.
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Re: scooba 390 charges but does not start up

Postby robotbot » October 25th, 2013, 10:03 pm

Just tried that too , Removed the sticker control panel cleaned it (It was clean to begin with), Still no cigar

Is there a test mode or diagnostic mode on the scooba 390 ?

Thanks for your reply btw!
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Re: scooba 390 charges but does not start up

Postby vic7767 » October 25th, 2013, 10:17 pm

Yes, but it uses the two buttons to activate the built in tests.
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Re: scooba 390 charges but does not start up

Postby robotbot » November 7th, 2013, 5:41 am

Hey vic7767

It turned out to be the UI Panel , I got a new one and boom it works again! Thanks again for your help
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Re: scooba 390 charges but does not start up

Postby vic7767 » November 7th, 2013, 11:19 am

@ robotbot glad to read that you resolved your Scooba UI issue. It's strange that it wasn't debris buildup under the button contact membrane. That is the high runner cause of failure on the earlier Scooba models.
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Re: scooba 390 charges but does not start up

Postby Gordon » November 7th, 2013, 1:26 pm

Unfortunately this is not an accurate description of Scooba's fault causing "debris":
vic7767 wrote:It's possible that debris has built up under the User Interface button contacts electrically insulating their function.
The old R2-Roomba series is notorious for accumulating room dust under its UI dome-spring switches to then prevent the required collapsing of a pushed down dome to close the switch (thus "insulating" one contact from the mating contact).

With the Scooba UIP switches the cause is due to a conductive "debris"--an electrolyte, free of visible particles--that permanently closes the switch! When the user presses such a contaminated switch, nothing happens because its contacts are already connected by the liquid.

Where does that liquid come from? One may ask.

The most obvious source and path are: A devoted / caring owner wipes clean Scooba using a wet rag, following a floor cleaning mission; and, a wayward droplet of that liquid happens to wet edges of the laminate stack (of plastic trim) right where Scooba's ribbon cable enters the stack. Capillary attraction draws that liquid towards the dome switch. One drop can likely fill the narrow channel and the tiny cavity volume of the actual switch. Both switch contacts become electrically connected by the presence of the liquid. Sealed off from ambient air, that liquid can't go away via evaporation. Game over, dead Scooba.
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Re: scooba 390 charges but does not start up

Postby TechGuy » November 7th, 2013, 2:05 pm

I clean the Scooba UI panel switches with rubbing alcohol and have 100% success rate.
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Re: scooba 390 charges but does not start up

Postby vic7767 » November 7th, 2013, 2:12 pm

Wow :lol: , I thought using the term "debris" would basically cover any material/process that would prevent the UI interface from working as designed. Possibly the verbage "insulated" instead of "shorted" may confuse some thread viewers of the exact cause of the button pressing failure. :roll:
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Re: scooba 390 charges but does not start up

Postby conurus » July 16th, 2017, 4:24 am

I looked at a broken UI panel and decided that the best preventive measure is to apply a piece of tape to secure it against the "eye" on the front bumper.

It appears to me that the "eye" on the front bumper could repeatedly peel the mylar sheet housing the power and play buttons and its flex circuit until the flex circuit breaks and the buttons become inoperative.

This should be done as a preventive measure whenever the front bumper is serviced.
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