Problem description
my roomba 555 has this issue: main brushes don’t turn when in cleaning mode. They always did and now they don’t (without exceptions).
What I checked already:
]the motor and the related mechanics are OK (how I checked that: attached 12V to the two pins at the brush module and the brushes turned nicely, continously, as I wished they did when its mounted)/:m]
]the side brush works absolutely fine/:m]
]the side brush module receives ~14.4V (corresponds to battery voltage) (how I checked that: I started the robot’s clean mode attaching a multimeter instead of the side brush module to the connectors)/:m]
]the main brush motor receives only 2.33V ! (how I checked that: I started the robot’s clean mode attaching a multimeter to the two rightmost pins of the main brush module connector. These pins lead directy to the motor when the module is installed)/:m]
Proposed solution:
A: debug the circuit board (probably too difficult)
B: send back to iRobot (too old for warranty; probably too expensive for me)
C: use a relais with this simple logic:
IF the side brush runs -> I also want the main brush to run.
The side brush runs with 14.4V. I will connect it in parallel with the control circuit of the relais. Once active, the relais will connect the battery power to the main brush motor.
[size=4]MY QUESTION:
[/size][size=4]is 14.4V the correct voltage for this motor? [/size][size=4]Since the board offers only 2.33V now, the correct voltage could have been 5V, 9V or 12V…
[/size]
related, but different (other forum users’) problems:
there, the motor was broken (no response at 9V): roomba-500-series-brush-deck-module-problem-t10226#p105747
there, the motor worked (tested with 5V) as in my case but it also >>sometimes<< worked when installed properly: roomba-563-main-brushes-not-spinning-t12647#p116316
related information:
How to replace this motor (very user friendly): robotshop.com/blog/en/chapte … ent-219613
The relais I bought (2$): conrad.de/de/printrelais-12 … 03611.html
Current of the brush motor: 200-500 mA run (1250-1400 stall), see “Roomba 500 Series Service Manual” at page 46
Different robot model and motor (a fan?) but details on how to debug a roomba circuit board. Maybe someone can transfer *that *knowledge to the brush motor problem: robotreviews.com/chat/viewto … =1&t=16345