But before throw it away, I think we could tear down it and see what look like inside.
The name of this printer is HP DJ F4280, I guess it is the cost down version of consumer level, because it has only 3 motors, one for CIS (Contact Image Sensor), one for ink x-axis motion, and final one for gear train and rollers.
|Plastic button + Press switch light guide for LED|
|Open Glass Window of Scanner.|
The module of CIS Scanner
|Detail picture of CIS module|
|There is a smaller DC motor, which use worm gear, to drive module itself and move on rack.|