Hacks, Mods, and Parts for your favorite Robot

4XX, 4XXX Roomba models

If you have a 4XX or 4XXX model Roomba with a side brush motor that either runs all the time or won't run at all then you can suspect that Q36 and/or Q17 have failed on the Printed Circuit Assembly Board.

If you have a 4XX or 4XXX model Roomba with a dust bin motor that either runs all the time or won't run at all then you can suspect that Q35 and/or Q18 have failed on the Printed Circuit Assembly Board.



Offered here for the first time are replacement NPN transistors so that you can get your Roomba up and running again.  You can use the Buy Now button to purchase a pair (2) of these transistors for $4 plus $2.60 USPS First Class Mail.


4XX - 4XXX Brush motor MOSFET

If your brush motor will run when connected to a Roomba battery or 9 volt battery but won't run when connected to the Roomba main PCA then it may be due to a U11 circuit device failure. On most of the circuit boards used today there is an additional location next to the U11 circuit that you can install a heftier MOSFET to run that brush motor.

You can order a replacement MOSFET for $5 plus $1.75 USPS shipping by sending a paypal payment to this email  (e_vickery(at)bellsouth(dot)net for  $6.75 and mention you want the U11 MOSFET replacement.