Hello guys,
Hope someone would be able to give some advice, as I am really kinda stuck.
I own a iRobot scooba 390 (floor washing robot) for almost two years now.
This robot stopped functioning while I was still in warranty and it was replaced.
While the new robot worked fine for a couple of months (and through the end of my warranty period),it started acting wired: whenever I started a cleaning cycle it started to move backward and stopped after 3 ft, waited for 2 seconds and continue another 3 ft backwards
I was able to get the service manual of a similar model robot (till model 380 or so), and started to run the built in test. When reached to #16 (wheel encoder) it failed the test and notify me that “Motor current and encoder speed” test is failing. This may explain the weird behavior I described above as the encoders give the robot some sense of where it is located in the room…
I opened the robot and disassembled it till reached the main board but saw nothing that could evident such an issue ( I thought maybe I’ll see some part blown or so).
So I am wondering if this robot is doomed to the garbage or there’s some way to fix it?
Any advice could help, appreciate any comment.
The wheel encoders are found in the robots wheels so it is usually hard to see if there is an issue. If you let the Scooba clean for a few minutes, does it eventually stop with a series of beeps? Do the wheels turn well by hand? Are they turning during the encoder test?
It is possible that the wheels are dirty or defective. We would suggest that you start by cleaning the robots wheels with a compressor or can of compressed air.
We also suggest that you verify the connections going from the wheels to the motherboard to make sure that one is not damaged.
In some cases, customers need to replace a wheel module.
How do I tell whether the wheel module I need to replace is the left or the right? Do you decide looking from the front or the rear? With the scooba up or upside down?
You have to look from the rear of the robot, like if you would drive the robot yourself.
You can refer to the image below.
Thank you, this was helpful to determine which Scooba 390 wheel was bad. Does the right wheel you have for sale here work with the Scooba 390? It says it’s for the 5800 and 5900, but aside from the color, looks like the ones on the 390.
The wheel motor assembly should be compatible with the Scooba 390 as well.
