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Chapters Menu
Chapter 1: What Is Roomba Discovery Series Saying To Me?
Chapter 2: How to Open/Replace Frame Roomba Discovery
Chapter 3: How to Replace Roomba Discover Series Main Brush Casing
Chapter 4: How to Replace Roomba Discovery Main Brush Motor
Chapter 5: How to Replace Roomba Discovery Motherboard
Chapter 6: How to Replace Roomba Discovery Speaker
Chapter 7: How to Replace Roomba Discovery Side Brush Motor
Chapter 8: How to Replace Roomba Discovery Side Brush Gear Assembly
Chapter 9: How to Replace Roomba Discovery Front Caster Wheel
Chapter 10: How to Replace Roomba Discovery Caster Wheel Drop Switch
Chapter 11: How to Replace Roomba Discovery Drive Wheel
Chapter 12: How to Replace Roomba Discovery Cliff Sensors
Chapter 13: Roomba Discovery Motherboard Connections
This guide will explain how to replace the cliff sensors on your
Roomba Discovery 4XXX/4XX series, pictured below:
12.1 Cliff Sensors Replacement
Roomba replacement cliff sensors can be found at RobotShop.
Removal Phase
1 - Remove any glue holding the caster wheel wires in place.
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2 - Unscrew screws (A).
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3 - Remove the springs which are attached to the cliff sensor array.
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4 - Remove the left contact for the bump sensors from the motherboard. Using a pair of pliers, pull down, then to the left.
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Remove the right contact by pulling down then to the right.
5 - Remove any glue holding the wires from the cliff sensor array on the right side.
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6 - Remove any glue holding the wires from the cliff sensor array on the left side.
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7 - Remove the connectors on the left of the motherboard that are connected to the cliff sensor array.
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8 - Remove the connections on the right of the motherboard that are connected to the cliff sensor array.
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9 - Remove the cliff sensor array by lifting it up.
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10 - View of Roomba with cliff sensor array removed.
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Assembly Phase
1 - Place the replacement cliff sensor array correctly in its place.
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2 - Reconnect the bump sensor connections to the motherboard. Pull on the connection with pliers and insert it in the right side of the bump sensor.
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Reconnect the bump lever on the left side by inserting it into the left side of the bump sensor.
3 - Reconnect the connectors on the left of the motherboard.
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For more details on the motherboard connections, see
Roomba Discovery 4XXX & 4XX Servicing and Repair Guide, Ch. 13: Motherboard Connections
4 - Reconnect the connectors on the right of the motherboard.