How to remove and repair lidar on a robot vacuum cleaner Xiaomi

Xiaomi’s robot vacuum cleaners have long proven themselves to be reliable cleaning assistants, but even the best devices eventually fail individual units. Most often, owners experience a laser sensor rotation error when the device reports a problem through an app or voice module. In such situations, expensive maintenance repairs are not always required, since often the problem lies in contamination or jamming of the turret mechanism.

Self-disassembly of lidar allows you to eliminate mechanical obstacles, clean the optics and lubricate the rotating shaft, returning the device to the ability to build accurate maps of the room. However, the process requires care, because the inside is electronics and fragile plumes, damage which can lead to complete inoperability of navigation. In this article, we will discuss in detail how to safely remove the module without violating the integrity of the connections.

Before you start any manipulation, you need to understand that you are interfering with the design of a complex electronic device, so all actions you perform at your own risk. It is important to prepare the necessary tool in advance and organize the workplace so that small screws and parts do not get lost in the process of work. Proper preparation reduces the likelihood of errors and helps to maintain a guarantee on the accompanying nodes, if you do not damage the seals on the main body.

Diagnostics of malfunction and preparation of tools

Before you start physically disassembling, you should make sure that the problem really lies in the mechanical part of the LiDAR module. Typical symptoms include constant reports of a rotational error, a robot moving chaoticly around the room or refusing to build a map when you start cleaning. Sometimes the device just stops and tells you to check the obstacle sensor with a voice, which often indicates that the rotating head is jammed.

To perform a good diagnostic and subsequent repair, you will need the minimum set of tools that most home craftsmen will find, the main tool will be a small cross screwdriver, since the screws in Xiaomi design are usually small and require a precise approach, and you may need a plastic blade or mediator to accurately open the latches without damaging the body.

Be sure to prepare the screw folding container, as the number of screws can vary depending on the specific vacuum cleaner model. Losing even one fastener can cause the body to vibrate or rattle while the engine is running.

• 🛠️ Cross screwdriver (size) PH0 or PH00) screw-twisting.
• 🧸 Plastic mediator or blade for opening latches.
• 🧹 Compressed air or pear to clean dust inside the mechanism.
• 💧 Isopropyl alcohol and lilaless wipes for cleaning optics.

⚠️ Warning: Before starting work, be sure to turn off the robot vacuum cleaner and disconnect it from the charging station. Working with the connected battery can lead to a short circuit if the plumes are accidentally damaged.

It is also important to consider that different models Xiaomi, Roborock or Viomi may have design differences in the attachment of the upper cover. In some cases, you need to remove the main cover completely, in others, it is enough to dismantle only the bumper ring.

The process of dismantling the upper cover and turrets

The process of removing the laser rangefinder begins with the gently removal of the top decorative panel, which is mounted on several perimeter screws and hidden latches on most models, first you have to unscrew all the visible screws, and then, using a plastic blade, gently walk along the junction of the housing, releasing the locks.

Once the outer cover is removed, you will see the interior layout, where the lidar module is usually located in the front or center of the device, a cylindrical turret connected to the main board by a flexible plume. The key here is not to put excessive effort into disconnecting the connector, as the contacts can be quite tight but fragile.

Removing the module itself often requires unscrewing the 2-4 screws holding it to the platform, or gently pulling it out of the seat if it is fixed by a tight fit.In some models, such as the Xiaomi Vacuum Mop, access to the mount may be limited to additional design elements.

When you're working with a plume, remember that some designs use a locking mechanism that you have to bend before you remove the cable, and if you pull the plume out by force, you can damage the tracks on the board or break the cable itself, which requires replacing the entire node.

Disassembly of the LiDAR module

Once the module is removed from the body, you can begin to disassemble it directly. The turret usually consists of two main parts: the bottom platform with the engine and the top rotating part with the laser and mirror. To disassemble, you need to remove the upper plastic ring, which is often held on glue or thin plastic fixtures.

Inside, you'll find a small electric motor that drives the mirror, and the optical unit itself, and that's where most of the dust, animal hair and small debris accumulate, which over time hardens and blocks rotation, and careful cleaning of this space often solves the problem without having to replace parts.

Particular attention should be paid to the engine shaft and the slip bearing. If there is plaque or oxidation on the shaft, they must be removed. For lubrication, it is best to use Teflon lubricant or special oil for mechanics, avoiding thick compounds that can freeze or collect dust.

• 🌀 Carefully remove the top transparent or matte ring of the module.
• 🧹 Remove all visible dust with brush and compressed air.
• 💧 Wipe the engine shaft with alcohol and apply a drop of lubrication.
• 🔍 Check the integrity of the plume inside the turret for clutters.

⚠️ Attention: Do not use WD-40 Or other penetrating lubricants to handle the spinning mechanism, which can dissolve the factory lubricant and damage plastic parts, and also evaporate over time, leaving the machine dry.

It's important not to lose a little spring or a contact pad that connects the rotating part to the stationary base, and these are the elements that transmit data and power to the laser emitter, and if the contact is broken, the robot will not be able to receive distance data to the objects.

Cleaning of optics and maintenance of the mechanism

The quality of the map depends on the purity of the optical elements inside the module. The laser beam passes through the lens system and is reflected off the rotating mirror, so even the smallest speck of dust in the path of the beam can create "noise" on the map or blind spots. Use special optics wipes and isopropyl alcohol to clean.

The mechanical part also requires attention: check if the motor is rotating freely. If you feel a backlash or jamming, it may be worn out and needs to be replaced. In some cases, simple purging with compressed air under pressure helps, which blows out dust stuck between the fan blades.

Once cleaned, assemble the module in reverse order, making sure all latches fall into place with a characteristic click.A loose assembly can cause a rotational axis to skew, causing error again after a short time of operation.

The lubricant should be applied minimally, literally microscopic droplet, spreading it around the shaft, and excess lubricant material when rotating can be sprayed on the insides of the sensor and settle on the lenses, which will worsen the quality of the scan.

Comparison of models and compatibility of details

When repairing, it is important to understand that the lidar modules can differ from generation to generation of robots. For example, the designs for the Xiaomi Robot Vacuum S5 and Xiaomi Robot Vacuum S50 can be interchangeable, but different from the Pro or Max series modules. Using an inappropriate spare part can lead to malfunctioning of the software.

When ordering spare parts on Chinese marketplaces, pay attention to the number of contacts in the connector and the location of the mounting holes. Visual similarity does not guarantee interoperability, since the firmware of the robot may not recognize someone else's sensor.

If you change the module completely, you may need to reset the map of the room and re-scan the apartment. Old maps created by the previous sensor may contain distortions that the new module will not be able to interpret correctly.

Assembly, calibration and testing

The final step is to assemble the device and check its performance. Put the module in place, plug the plume until the characteristic click and fix the screws. Don't tighten the screws too much to not break the thread in the plastic case, but make sure that the module sits tight and does not stagger.

Once turned on, the robot usually performs a self-test, during which it scrolls the lidar several times in different directions, if there are no errors, you can start building a map. In the application, select "Pinpoint Cleanup" or "Local Cleanup" to check how the device navigates in space.

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When you first clean up after repair, open the app and follow the map in real time. If the walls are flat and the robot is not "scrambled" from invisible obstacles, then the repair was successful.

In some cases, especially after a new module is replaced, calibration may be required, and it often happens automatically in the first minutes of operation, but if the robot continues to make mistakes, try to start cleaning in a well-lit room with minimal obstruction.

⚠️ Warning: If the robot makes a grinding or vibration after assembly, turn it off immediately, which is a sign that the module is crooked or that the screw is interfering with the rotation of the mechanism.

The successful calibration is confirmed by the exact match of the virtual map with the actual layout of the room. If the robot gets lost in the flat, it may be that the laser beam is still contaminated or the plume is not fully connected.

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Quality cleaning and lubrication in 80% of cases bring the old lidar back to life, making the purchase of a new spare part unnecessary.

Frequently Asked Questions (FAQ)