You can now find repair guides for your Roomba Discovery series (4XXX and 4XX) robots posted on the Ultimate Roomba Resource Center. These manuals will guide you through the removal and replacement of the main components in these Roombas. See below for links to the repair guides, and also likely causes for each repair:
Chapter 1: What is Roomba saying to me? - what Roomba’s beeps and songs mean.
Chapter 2: Opening up your Roomba - how to open or dissassemble Roomba’s frame.
Chapter 3: Main Brush Casing - how to replace Roomba’s brush casing. Likely causes: Roomba’s brushes not turning, Roomba not picking up well, Roomba brushes making noise, Roomba beeps once.
Chapter 4: Main Brush Motor - how to replace Roomba’s brush motor. Likely causes: Roomba’s brushes not turning, Roomba not picking up anything, Roomba brushes stop on carpet. Roomba beeps once.
Chapter 5: Motherboard - how to replace Roomba’s motherboard. Likely causes: Roomba not charging, Roomba spinning in circles (bumper sensor failure).
Chapter 6: Speaker - how to replace Roomba’s speaker. Likely causes: Roomba never beeps.
Chapter 7: Side Brush Motor - how to replace Roomba’s side brush motor. Likely causes: Roomba side brush won’t turn. Roomba beeps twice.
Chapter 8: Side Brush Gearbox - how to replace the side brush gearbox. Likely causes: Roomba side brush won’t turn, Roomba side brush turns very slowly. Roomba beeps twice.
Chapter 9: Caster Wheel - how to replace Roomba’s front caster wheel. Likely causes: Roomba squeaks when running, Roomba caster wheel worn or won’t turn.
Chapter 10: Caster Wheel Drop Switch - how to replace Roomba’s caster wheel drop switch. Likely causes: Roomba moves side to side like a duck, Roomba beeps ‘uh-oh’.
Chapter 11: Drive Wheel - how to replace Roomba’s left or right drive wheel. Likely causes: Roomba spinning in circles, Roomba does not move in a straight line, Roomba beeps 4 times.
Chapter 12: Cliff Sensor Array - how to replace Roomba’s cliff sensor array. Likely causes: Roomba will not start but gives a single ‘ehh’ beep, Roomba beeps 5 times.
Chapter 13: Roomba Discovery Motherboard Connections - explains where the motherboard connectors go. Useful reference during most repairs.