The Xiaomi Roborock S5 is a complex technical device whose efficiency depends on the state of its sensor system. The owner of smart equipment often faces a situation where the device suddenly stops building a map, gets stuck in a flat place or randomly rushes around the apartment. In most cases, the problem lies not in a software failure, but in the banal contamination of optical and laser elements.
Regular maintenance of optical sensors allows you to extend the life of the device and keep its navigational abilities at a high level. Dust, pet hair and small debris can completely block the operation of the laser rangefinder or elevation sensors. Ignoring cleaning leads to rapid engine wear and battery discharge due to inefficient routes.
In this guide, we will take a detailed look at the maintenance of all the sensor types installed in the S5, how to safely access hidden items, what tools to use and what you can not do to avoid damaging fragile electronics.
Types of sensors in Roborock S5 and their purpose
Roborock Navigation System S5 It's based on a combination of different sensors, each of which has a unique function. LDS-The Laser Distance Sensor, which is located in a characteristic tower ledge on the top lid, scans the room, creating an accurate digital map and laying out optimal routes.
At the bottom of the case, there are many additional optical and infrared sensors that are responsible for detecting obstacles, determining the height of thresholds and controlling the entry of carpets. The LDS laser window in the S5 is under a transparent cap that rotates during operation, and it is its purity that is critical to building a map. Any of these elements that breaks down leads to errors in the application.
The wheel and bumper sensors also help the device gently touch furniture and detect contact with obstacles. Wheel sensors monitor the passability and help the robot know if it is stuck. The complex operation of all systems provides the same “intelligence” that Xiaomi products are valued for.
- 🔹 LDS-Sensor: Creates a 360-degree map of the room in real time.
- 🔹 Optical floor sensors: determine the type of coating and presence of dust to automatically increase power.
- 🔹 Infrared drop sensors: prevent falling from stairs and steps.
- 🔹 Bumper sensors: detect mechanical contact with objects.
Necessary tools for maintenance
Before the procedure, you need to prepare a desktop and a set of tools. Do not use aggressive household chemicals or abrasive materials, as they can damage plastic lenses and sensor cases.
The main tool will be soft, lilaless fabric made of microfiber, which is the perfect material to collect dust without leaving scratches and villi on the surface of the optics, and cotton swabs that allow point-to-point action on pollution are great for removing ingested dirt in hard-to-reach places.
If the contamination is severe, you can use distilled water or a special spray to clean the optics. Conventional tap water can leave limestone plaque after drying, which will worsen the transparency of the lenses. You will also need a dry toothbrush with soft bristles to clean the grilles and mechanical parts.
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Use only distilled water to wet the fabric to avoid white stains on the sensor lenses after drying.
Cleaning the main laser sensor (LDS)
The most important element of navigation is the laser module in the top tower. If the robot starts to build curved maps, bump into obstacles it knows, or emit an LDS error, the problem is almost always pollution. Remove the top cover of the case by unscrewing a few screws if you want access to the insides, but for surface cleaning this is not always necessary.
Carefully wipe the transparent plastic window on the end of the tower with a dry microfiber. The movements should be circular and light, without heavy pressure. If you notice that dust has accumulated inside the transparent cap, you can try to blow it with compressed air, but it is not recommended to open the laser mechanism without experience.
⚠️ Warning: Never use alcohol-containing solvents to wipe a plastic cap LDS-Aggressive chemistry can cause plastic to become cloudy or microcrack, which irreversibly distorts the laser beam.
Once cleaned, run the map in the app and make sure that the route is built, and if the robot has started to behave properly, then the procedure has been successful, and regular inspection of this site should become a habit, especially in homes with pets, whose fur is easily tightened by the fan of the tower.
☑️ Verification LDS-system
Maintenance of lower sensors and wheels
The bottom of the Roborock S5 is exposed to maximum contamination. Turn over the device and inspect the black plastic windows of the sensors. They are often stuck with dust clumps and wool that block infrared radiation. Gently wipe each sensor with a wet and then a dry cloth.
So, you can focus on the carpet detection sensor and the dust collector, which are in the middle of the bottom, and if you contaminate the dust collector sensor, you can make the robot think the container is full and stop cleaning, and cleaning these areas often solves the problem of false errors.
Remember to clean the sensors on the bumper and in the wheel niches. Hair is often wound around the wheels, which cuts off access to the touch windows. Use tweezers or toothpicks to remove hair from the side slits, but act carefully so as not to damage the wires.
| Type of sensor | Location. | Frequency of cleaning | Tool. |
|---|---|---|---|
| LDS (Laser) | Upper Tower | Once every 2 weeks | Microfiber |
| Paul/Carpet | Downtown | Once a week. | Wet fabric |
| Altitude difference | Underbody perimeter | Once a month | Dry fabric |
| Dust collector | Inside the bay. | Every cleaning | Dry brush |
Care for bumper and wheel sensors
The bumper Roborock S5 is equipped with several contact and optical sensors. The mechanical bumper button can stick due to dust or sweet liquid getting inside. To clean, gently press the bumper several times to detect jamming, and wipe the visible parts of the sensors.
Wheeled modules also have sensors that control their rotation. If a robot reports a wheel error, it is often enough to simply clear the side edges of the wheel and the gap where it enters the body, and there is dense dust that accumulates, which blocks the sensors (Hall sensors).
For deep cleaning, you can remove the side brush and gently clean the space around the wheel with an old toothbrush. Make sure that nothing interferes with rotation. After cleaning, check if the wheels are free when pressed with your hand.
What to do if the sensor is stuck?
Checking after cleaning
Once all the cleaning procedures are complete, you need to assemble the device and do the testing. Turn on the robot vacuum cleaner and wait for the completion (self-check). Pay attention to the beeps: the absence of warning beeps indicates that the system does not see errors.
Run the cleaning through the Mi Home or Roborock app. Watch the first minutes of operation: the device should quickly determine its location and start building a route. If the robot spins in place or tries to drive onto a dark carpet, reading it as a cliff, repeat cleaning the corresponding sensors.
You can see the cleaning history and map in the app, and if the map is built clearly, without noise or tears, the laser sensor is working correctly, and if you keep running smoothly without going back to the base to recharge in the middle of the room, you'll see that the entire sensor system is working.
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Cleaning the sensors gives the robot 100% of its navigational abilities and prevents false system errors.