Abstract: An assembly system may be provided for attaching together display layers for an electronic device display. The system may include substrate cleaning equipment that includes one or more pressure-sensing cleaning rollers (124) for removing debris from the display layers during assembly operations. A pressure-sensing cleaning roller (124) may include a cylindrical roller member having a tacky surface and one or more pressure sensors (136) configured to sense pressures that are applied to the display layers during cleaning operations. The position and orientation of the cleaning rollers (124) may be adjusted before or during cleaning operations based on pressure data gathered using the pressure sensors. The pressure sensors (136) may be attached to the tacky surface of the cylindrical roller member, attached to an edge of the roller member, embedded within the roller member, or attached to other equipment that moves with the roller member.