770 bin d/c problem

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770 bin d/c problem

Postby Devx » June 20th, 2017, 2:38 am

Hoping people on this board can help me out.

I’m experiencing a problem with my iRobot Roomba 770. It will no longer complete a cleaning cycle and stops mid-cycle with the red triangle /!\. I eventually traced this to the bin not being seated properly. If I reseat the bin and press clean, it will clean for another 5-10 minutes and stop again with the triangle. Rinse, repeat.

I obviously cannot continue to do this as if I have to babysit the clean process I may as well use my upright and do the entire job myself. My question then is, what steps can I take to fix this? I’ve already tried cleaning the bin module contacts on the bin and on the robot. Not sure what to reset or replace. The 770 is long out of warranty, 5+ years old now.
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Re: 770 bin d/c problem

Postby a1robotrepair » June 20th, 2017, 7:26 am

Your problem points to the bin sensors, the 2 rectangular posts that hang in front of the bin. Clean them and the bin indents that match to them. Make sure the bin fits snugly and doesn't wobble.
BIT test #21, this post: http://www.robotreviews.com/chat/viewtopic.php?f=1&t=14695&hilit=700+BIT
Do all the BITs, 5 years it's probable time to take it apart, clean, lube, check bits and replace failing modules.
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Re: 770 bin d/c problem

Postby saba11 » June 20th, 2017, 8:11 am

This is quite interesting since my Roomba 770 had the same problem. I wasn't able solve it and had to make an upgrade.

I finally bought the Roomba 880 and it seems to be free of the problems Roomba 770 had.
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Re: 770 bin d/c problem

Postby a1robotrepair » June 20th, 2017, 8:37 am

saba11 wrote:This is quite interesting since my Roomba 770 had the same problem. I wasn't able solve it and had to make an upgrade.

I finally bought the Roomba 880 and it seems to be free of the problems Roomba 770 had.

There is an OSMO update that I believe eliminated the bot shutting down from just 1 one the bin sensors activated, 2013-11-20-1456, Black OSMO.
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Re: 770 bin d/c problem

Postby Devx » June 21st, 2017, 1:22 am

Thanks for the replies. Cleaned the sensors on the bot and the area on the bin (didn't even know that's what those were) but no change in behavior. It seems to be deteriorating. To jumpstart a clean session I have to reseat the bin maybe a half dozen times or more to get it to start and only run for a few minutes.

Not sure how to interpret the BIT test results. So I entered test 21 for the optical dirt sensors.

The dock and spot buttons illuminate and then the magnifying glass icon flashes a bit. Then spot goes out and comes back, then dock goes out and does not come back while spot remains lit. If I remove the bin during this phase, either before or after, no change.

saba11, I'm thinking I may follow your path and upgrade. The new models that have Wifi, App, Alexa, and especially iAdapt 2 are very tempting. I could use my 770 somewhat as a parts bot for my 530 (still going 8+ yrs!) somewhat. I just replaced the wheels on the 770 too...
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Re: 770 bin d/c problem

Postby a1robotrepair » June 21st, 2017, 6:49 am

The only way to tell if the BIT has passed is to monitor the SCI port with term software while doing the BIT.
I would make an educated guess that your circuit board is good and that one of the sensors are bad.
It would be nice to know if the OSMO is for the early 700 series bin failures. I have that OSMO.
Message me on how to get that update. I have not had an opertunity to interact with this problem on a 700/800 series.

Press and hold Spot and Clean. Toggle Dock 6 times and release all buttons. This will show firmware build date.
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Re: 770 bin d/c problem

Postby Devx » June 21st, 2017, 5:27 pm

Are the sensors modular? Are they hardwired or soldered in?

Date 7A9
2011 0826
0932
UI
Sun
0779
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Re: 770 bin d/c problem

Postby a1robotrepair » June 21st, 2017, 6:37 pm

They are modular, 6 pin plugs onto bottom of UI board, 1 emitter and 2 receivers in each post.
I have never seen them for sale. eBay member CaSino187 would be the one I would contact to see if he has any. If you find a 700 chassis it will come with them installed.
Your date code is one of the earliest...6 years old, it would benefit from a firmware update.
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Re: 770 bin d/c problem

Postby Devx » July 16th, 2017, 2:33 am

Thanks for the help a1. I finally identified that the dust bin full sensors were not at fault (I bought new ones). Instead, it appears the dust bin itself has failed. I suppose it's just another module so I should've thought of it.

If I connect an older 5xx series bin (after a bit of disassembly) in place of the 770's bin, the 770 fires up every time. I'm assuming the fan has failed In the 770 bin since the dust bin module appears to only be 2 power contacts, a PCB, and the fan motor. Either way, I ordered a replacement dust bin for the 770. Will update if that works.
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Re: 770 bin d/c problem

Postby Devx » July 19th, 2017, 2:15 pm

Quick Update...replacing the dust bin resolved the issue for me. 770 is working again.
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