Xiaomi Roborock S6 is famous for its smart navigation, but over time, even the most advanced technology begins to “glutch”: lose orientation in space, collide with furniture or refuse to go on carpets. 90% of the time, the fault is polluted sensors. Dust, animal hair and small debris accumulate on the lenses of a laser scanner (LDS), optical sensors and contact areas, distorting signals. If your vacuum cleaner becomes unpredictable, do not rush to carry it to service: most often the problem is solved by cleaning the sensor carefully in the home.
In this article, we will discuss what sensors are in Roborock. S6, How to clean them properly so as not to damage fragile electronics, and what to do if after cleaning problems remain, you will also learn what materials are absolutely not used for the care of sensors (spoiler: wet wipes and alcohol are not always the best assistants). This is also suitable for other Roborock models (S5, S7, S8), But with their design features in mind.
What sensors are in the Xiaomi Roborock S6 and what they are responsible for
The Roborock S6 vacuum cleaner has several types of sensors, each of which plays a different role in navigation and safety, and its pollution is different:
- 🔦 LDS-The sensor (laser scanner) is a rotating tower on top of the housing, responsible for mapping the room, signs of contamination: the vacuum cleaner is blind, drives randomly, can not see walls or furniture.
- 🚪 Collision sensors (bumpers) are located around the perimeter of the front panel, react to obstacles, signs of pollution: the robot hits the legs of chairs, although it used to circle them.
- 👁️ Optical sensors (cliff sensors) are under the front bumper, prevent falling from stairs, signs of pollution: the vacuum cleaner is afraid to enter dark carpets or, conversely, slides off them.
- 📡 Charge sensors are contact points on the hull and docking station, signs of contamination: the robot does not find the base or is not charging well.
Many users mistakenly think that it is enough to wipe only LDS-So if you're doing a comprehensive cleaning of all the sensors, you get the best results, for example, if the optical sensors are covered in dust, the vacuum cleaner might think there's a gap in front of it, and refuse to clean in some areas.
Preparation for cleaning: what you will need and precautions
Before you start cleaning, prepare the necessary tools and materials. Not all available tools are suitable - some can damage the delicate surfaces of the sensors.
- 🧴 Compressed air (a canister for cleaning equipment) - removes dust from hard-to-reach places.
- 🧼 Soft brush (for example, for drawing or makeup) – suitable for dry cleaning.
- 🧷 Cotton swabs (better with a plastic rod) - for spot cleaning.
- 🧴 Special wipes for optics (without alcohol!) - for cleaning the lenses LDS.
- 🔧 Torx screwdriver T5 — if you need to remove the bumper.
⚠️ Note: Do not use wet wipes for household appliances - they leave divorces on the lenses. LDS, Also avoid abrasive materials (sandpaper, hard brushes) and aggressive solvents (acetone, gasoline).
Before you start, disconnect the vacuum cleaner from the power supply (get the battery or turn off the button on the case). If you clean the sensors for the first time, take a picture of their location, this will help avoid errors in the assembly. For convenience, you can use a flashlight to better see the contamination in the recesses.
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If you don't have a special wipe for optics, you can use microfiber fabric, slightly moistened with distilled water.
Step-by-step cleaning LDS-sensor (laser scanner)
LDS-The sensor is the most important and at the same time the most vulnerable element of Roborock. S6. It's made up of a rotating lens and a receiver that collects data about the room, and even a thin layer of dust on the lens can distort the signal, causing the vacuum cleaner to become disoriented.
How to clean:
- Remove the LDS cover. Pull it up carefully, it's held on the latches. Don't put too much effort into it.
- Remove the dust with compressed air. Hold the sprayer vertically at a distance of 10-15 cm, with short presses (no more than 2 seconds) blow out the lens and internal parts.
- Wipe the lens. Use a dry napkin for optics or microfiber. Move from center to edge without pressing hard.
- Clean the mirror inside. With a cotton swab dipped in distilled water, gently wipe the reflective surface (don't scratch!).
- Make sure the lid is firmly sliding, without any skewing.
⚠️ Attention: If after cleaning LDS The vacuum cleaner will still go blind, check if moisture has hit the board contacts, in which case dry the sensor 24 hours before turning on. If the problem persists, the module itself may have malfunctioned (replacement is required).
The lid is off effortlessly.
The lens is compressed air.
The mirror washed without divorce
The cover is set straight, without gaps-->
Once you've assembled, turn on the vacuum cleaner and check it. If the map of the room is clearly built and the robot is not "lost," you did the right thing. If there are any errors, move on to cleaning the other sensors.
Cleaning of collision sensors and optical sensors
Collision sensors (bumpers) and optical sensors (cliff sensors) are most often contaminated by close contact with floors and furniture, and dust, hair and small debris accumulate on their surfaces, causing the vacuum cleaner to become “afraid” of obstacles or, conversely, not notice them.
Cleaning instructions:
| Type of sensor | Location. | How to clean | Signs of pollution |
|---|---|---|---|
| Collision sensors | Under the front bumper (right and left) | Remove the bumper (screwdriver T5), blow with compressed air, wipe the contacts with a cotton swab with isopropyl alcohol (no more than 70%). | The robot hits furniture, although it used to go around it. |
| Optical sensors (cliff) | Under the front panel (4 pcs) | Wipe the lenses with a dry cotton swab, remove dust from the depressions with a brush. | A vacuum cleaner is afraid of dark surfaces or pulls off carpets. |
| Charge sensors | On the hull and docking station. | Wipe the contacts with alcohol (90%+), remove oxidation with a eraser. | The robot does not dock well with the base or does not charge. |
Pay special attention to cliff sensors, and their lenses are often covered with greasy coating from the floor, and if conventional cleaning doesn't work, you can use a special optics cleaner (sold in photo stores) and put it on a napkin, not on a sensor!
What if the sensors don’t work after cleaning?
Cleaning of charge contact sensors and docking station
Charging problems are one of the most common complaints of Roborock S6 owners, most often oxidized or contaminated contacts on the body of the vacuum cleaner and docking station, which accumulate dust, fat and even corrosion (if the room is high humidity).
How to clean contacts:
- Disconnect the docking station from the network.
- Wipe the base contacts with a cotton swab dipped in isopropyl alcohol (90%+). Use an eraser for severe contaminants, which removes oxidation.
- Clean the contacts on the vacuum cleaner (located under the lid, next to the switch button). Use the same stick with alcohol.
- Check the spring contacts at the base, they should move freely. If they're jammed, gently put a needle on them.
After cleaning, do not turn on the vacuum cleaner immediately - let the alcohol evaporate (5-10 minutes). If the contacts are highly corroded, you can apply a thin layer of technical vaseline (sold in car stores) to protect against moisture.
⚠️ Warning: If the vacuum cleaner still does not charge after cleaning, check the voltage on the power supply (should be) 20V). Also inspect the cable - often the problem lies in broken wires at the base of the plug.
Frequent Mistakes in Sensor Cleaning and How to Avoid Them
Many users make the same mistakes that not only don't solve the problem, but make it worse, and the most common ones are:
- 🧴 Use of household detergents. Soap, glassware, or wet wipes leave a film that attracts dust.
- 💦 Excessive moisture, water or alcohol on the board may cause short circuits, all liquids must be minimally moist.
- 🔧 Use of force in disassembly. S6 If the lid is not removed, look for hidden mounts, not press harder.
- 🧲 Ignoring magnetic sensors. There are magnets in the vacuum cleaner that help you determine the position of the bumper. You can't touch them with metal objects!
Another common mistake is cleaning just one sensor, for example, if you wipe only the LDS and leave the optical sensors dirty, the vacuum cleaner still doesn't work properly, and a comprehensive approach is key to success.
1. condition of wheels and brushes (worn parts can simulate sensor malfunction).
2. firmware updates (newer versions often fix navigation bugs).
Settings in the Mi Home app (possibly miscalibrated).-->
When cleaning doesn't help: Signs of sensor malfunction
If you've cleaned all the sensors thoroughly, but the vacuum cleaner is still acting strangely, it's probably a hardware malfunction.
- 🔴 LDS-sensor: vacuum cleaner spins in place and emits an error Laser sensor is locked (code 9.
- 🚫 Collision sensors: the robot does not respond to even large obstacles (such as the foot of the table), probably damaged sensors or wires.
- 🌀 Optical sensors: vacuum cleaner is afraid of any dark coating, even if it is flat.
- ⚡ Charge sensors: contacts are clean, but they're not charging, and it could be the power supply or the controller on the board.
In such cases, self-repair is not recommended - it is better to contact the service center.
- 🔌 Power dock (possibly burned power supply).
- 📱 Settings in the application (sometimes the calibration of sensors is confused).
- 🔄 Reset to factory settings (in Settings) → Reset in the Mi Home app).
If the vacuum cleaner is warranty, don't disassemble it yourself, which can cause repairs to be denied. In the service center, the diagnostics are carried out using special equipment that tests each sensor separately.