![](/uploads/j/g/jgendron/imported/114-560x162.jpg)
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.
![Roomba Discovery 4XXX & 4XX Servicing and Repair Guide](/uploads/j/g/jgendron/imported/237-560x420.jpg)
2 - Unscrew screws (A).
![Roomba Discovery 4XXX & 4XX Servicing and Repair Guide](/uploads/j/g/jgendron/imported/333.jpg)
3 - Remove the springs which are attached to the cliff sensor array.
![Roomba Discovery 4XXX & 4XX Servicing and Repair Guide](/uploads/j/g/jgendron/imported/428.jpg)
4 - Remove the left contact for the bump sensors from the motherboard. Using a pair of pliers, pull down, then to the left.
![Roomba Discovery 4XXX & 4XX Servicing and Repair Guide](/uploads/j/g/jgendron/imported/526.jpg)
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.
![Roomba Discovery 4XXX & 4XX Servicing and Repair Guide](/uploads/j/g/jgendron/imported/624.jpg)
6 - Remove any glue holding the wires from the cliff sensor array on the left side.
![Roomba Discovery 4XXX & 4XX Servicing and Repair Guide](/uploads/j/g/jgendron/imported/720.jpg)
7 - Remove the connectors on the left of the motherboard that are connected to the cliff sensor array.
![Roomba Discovery 4XXX & 4XX Servicing and Repair Guide](/uploads/j/g/jgendron/imported/816-560x420.jpg)
8 - Remove the connections on the right of the motherboard that are connected to the cliff sensor array.
![Roomba Discovery 4XXX & 4XX Servicing and Repair Guide](/uploads/j/g/jgendron/imported/916-560x420.jpg)
9 - Remove the cliff sensor array by lifting it up.
![Roomba Discovery 4XXX & 4XX Servicing and Repair Guide](/uploads/j/g/jgendron/imported/1016.jpg)
10 - View of Roomba with cliff sensor array removed.
![Roomba Discovery 4XXX & 4XX Servicing and Repair Guide](/uploads/j/g/jgendron/imported/1118-560x420.jpg)
Assembly Phase
1 - Place the replacement cliff sensor array correctly in its place.
![Roomba Discovery 4XXX & 4XX Servicing and Repair Guide](/uploads/j/g/jgendron/imported/1215-560x420.jpg)
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.
![Roomba Discovery 4XXX & 4XX Servicing and Repair Guide](/uploads/j/g/jgendron/imported/2012-08-14_162558.jpg)
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.
![Roomba Discovery 4XXX & 4XX Servicing and Repair Guide](/uploads/j/g/jgendron/imported/1315-560x420.jpg)
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.