Disassembling the mop Xiaomi Derma: a step-by-step guide with photos and repair tips

Xiaomi Derma has become a popular cleaning solution thanks to its combination of functionality and technology. However, even the most reliable equipment requires maintenance: cleaning, replacing consumables or repairing. You may need to disassemble the device yourself to replace the battery, clean the internal parts from mold, fix engine malfunctions or restore operation after a fall.

In this article you will find a step-by-step instruction with a photo, which will help you carefully disassemble the mop Xiaomi Derma (Derma models). R1/R2 We also tell you what tools you need, how to avoid typical errors and what to do if the device stops turning on after assembly.

If you've never done a household appliance before, don't worry: Xiaomi's mop design is designed to be self-maintenance, the key is to follow the instructions and not make unnecessary efforts where parts are fixed with plastic clips, and for those planning repairs, at the end of this article we have a list of the most frequent breakdowns and ways to fix them.

Preparation for disassembly: tools and security measures

Before you start disassembling, make sure the mop is completely off and disconnected from the charger. If the battery is removable, remove it, which will prevent short circuits and accidental switching on while you're running.

To disassemble Xiaomi Derma, you will need:

• 🔧 Plastic mediator or guitar mediator - for careful separation of the latches of the body.
• ⚒️ Cross screwdriver (PH0 or PH1) — screw-off.
• 🔍 Tweezers – help you extract small details or contacts.
• 📸 Smartphone for photography – fix each stage so as not to confuse details during assembly.
• 🧴 Isopropyl alcohol (70%+) — to clean the contacts if the mop is not charged.

If you plan to clean the interior of mold or dirt, prepare a soft brush (such as a toothbrush) and dry tissue without pile. Avoid using metal tools - they can scratch plastic or damage circuit boards.

⚠️ Warning: Do not use sharp objects (knives, screwdrivers) to separate plastic parts, this will lead to chips and cracks that cannot be hidden during assembly.

If your model Xiaomi Derma is under warranty, remember: self-disassembly cancels warranty obligations.

Step 1: Removal of the nozzle and division of the body into two parts

So, to start with, the simplest thing is to remove the washing nozzle, and most Derma models use a quick-removal mechanism to do this.

1. Hold the mop vertically, with the nozzle up.
2. Press the red button of the fixator (located at the junction of the handle and nozzle).
3. Pull the nozzle down - it should easily separate.

If the nozzle is not removed, check if the lock is jammed due to dirt. WD-40 or silicone lubrication into the mechanism and try again in 5 minutes.

Now we move on to the separation of the main body. The case Xiaomi Derma consists of two halves, fastened by latches and screws.

1. Turn the mop down with the handle.
2. Remove the rubber plug at the bottom of the handle (hidden screw is hidden under it).
3. Unscrew the screw with a cross screwdriver.
4. Insert a plastic mediator into the gap between the halves of the body (start at the top where the handle is) and gently guide it along the perimeter, detaching the latches.

If the case fails, don't force - you've probably missed the screw or the latch. Check the mop again: in some versions, the screws may be hidden under stickers or rubber inserts.

Make sure the mop is off and off-charging

Remove the washing nozzle

Unscrew all visible screws (including those hidden under plugs)

Prepare a plastic mediator to disconnect the latches

Take a picture of the details before the disassembly-->

Step 2: Removal of the battery and electronic unit

After the body is separated, you'll see the mop's interior design, and there's a battery pack at the top (closer to the handle), and there's an electronic module with a motor and a pump at the bottom.

1. Disconnect the power connector connecting the battery to the board (usually white or black).
2. If the battery is secured with screws, unscrew them. In some models, it is fixed with sticky tape - carefully tuck it into the mediator.
3. Remove the battery by holding it by the plastic case (don’t pull the wires!).

Now we can start removing the electronic block, and it's attached to the body by:

• 🔩 Rotors (2-4 pieces, depending on the model).
• 🧲 Bilateral Scotch (for vibration amortization).
• 🔌 Connectors (power, sensors, motor).

Unscrew the screws and gently disconnect all the connectors, remembering their location. If the contacts are oxidized (green coating), clean them with isopropyl alcohol and cotton swab.

⚠️ Warning: Do not touch open contacts on the board with your fingers - static electricity can damage the chips. If you work on a carpet or in a dry room, touch the grounded metal object (for example, a heating battery) beforehand).

If you're disassembling a mop because of charging problems, check the contacts on the battery and board. Often, the cause is oxidation or contamination. Use eraser or alcohol to clean.

Step 3: Disassembly of the detergent unit and the pump

The washing unit is the mop's heart, which is responsible for the water supply and rotation of the nozzle. In Derma models, it consists of:

• 💦 Pump (responsible for spraying water).
• 🌀 Electric motor (rotates the nozzle).
• 🔄 Reductor (transmits torque).
• 💧 Tube and valves (dose the supply of liquid).

To access these details:

1. Remove the upper cover of the washing unit (it is attached to 2-3 latches).
2. Disconnect the silicone tubes that go from tank to pump. Be careful - they can be brittle after prolonged use.
3. Unscrew the screws that lock the pump and engine.

Pay special attention to the gearbox. If the mop makes a grind or does not rotate the nozzle, the problem may be the wear of the gears. In this case, you will need to replace the gearbox or lubricant (use silicone lubricant for plastic gears).

If the pump is not pumping water, check:

• 🔍 Integrity of tubes (whether there are cracks or blockages).
• 💡 The operation of the valve (it can stick due to lime plaque).
• 🔋 Power pump (call multimeter contacts on the board).

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If the tubes are clogged with limestone, soak them for 1-2 hours in a solution of vinegar (1: 1 with water), then rinse with water. This will return them to passability without mechanical cleaning.

Step 4: Cleaning and Maintenance of Internal Parts

After disassembly, it is recommended to carry out a complete cleaning of all components, which will prolong the life of the mop and prevent the appearance of unpleasant odor.

1. Water and tube tank

Rinse the tank with warm water with citric acid (1 tbsp. spoon per 1 liter of water) - this will remove the lime plaque. Clean the tubes with a syringe, filling it with the same solution.

Nozzle and brushes

Remove the brushes from the nozzle (they are attached to latches or screws) and rinse them under a stream of water. Use a solution of chlorhexidine to disinfect (0.05%). If the pile of the brush is worn, replace them with new ones (Article for Derma) R1/R2: MDY-001).

Electronic unit

Remove dust from the board with a soft brush or compressed air canister. If there are traces of corrosion (green or white spots), clean them with alcohol. To protect against moisture after assembly, apply silicone conformal lubrication to the contacts.

Engine and gearbox

Check if the engine shaft has hairs or threads that might have wound during cleaning, and grease the gearbox and gears with silicone lubrication (don’t use oil-based oils – they corrode plastic).

⚠️ Warning: If you find mold inside the case (black or green spots), after cleaning, treat the parts with hydrogen peroxide (3%) or a special antiseptic for the technique.

After cleaning, allow all parts to dry completely within 12-24 hours. Do not collect the mop wet - this will short circuit!

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Regular cleaning of internal parts (every 3-6 months) prevents 80% of mop breakages associated with clogging or corrosion.

Step 5: Replace consumables and repair typical faults

If disassembling the Xiaomi Derma mop is related to repair, here are the most common problems and ways to fix them:

1. The mop is not switched on

Reasons:

• 🔋 Battery discharged or defective.
• 🔌 The power connector on the board is damaged.
• 💥 Power transistor fails (often burns when voltage surges).

Decision:

Call the battery with a multimeter - the voltage should be close to the nominal (for example, 8.4V Li-ion 7.4V). If the battery is in good condition, check the charge for blackened or bloated parts. Transistors and diodes can be replaced with a soldering iron (power no more than 30 watts).

2. The nozzle is not rotating.

Reasons:

• 🌀 Wear of gears of gear gear gears.
• 🔗 Drive shaft break.
• 💡 Engine malfunction (winding break).

Decision:

Check the integrity of the gears. If they're worn, replace the gearbox. R1: MDY-003). The engine is called a multimeter - the resistance of the winding should be within 10–50 ohms.

3. Not spraying water

Reasons:

• 💦 Nozzles or tubes clogged.
• 🔄 The pump is faulty (burned winding).
• 📉 Low voltage on the pump (control charge problems).

Decision:

Clean the tubes and injectors. If the pump doesn't buzz when you turn it on, check its power. 3.3V or 5V (If the pump is defective, replace it (article: MDY-005).

4. The mop itself is switched on or off.

Reasons:

• 🎛️ Faulty position sensor (gyroscope).
• 🔋 Problems with battery contacts.
• 💻 Failure of the management board firmware.

Decision:

Try reflashing the fee (if you have access to service software) and replacing the gyroscope (article) will help in most cases: GY-521 analogue).

Use only original parts or certified counterparts to replace parts. Cheap Chinese copies often have a lower life and can lead to repeated failure.

Step 6: Mapping and checking the working capacity

The assembly is done in reverse order, but there are a few nuances that will help to avoid errors:

1. Put all the connectors in their places. Focus on the photos taken before the disassembly.
2. Secure the battery and connect it to the board, make sure the contacts are not closed.
3. Lay the tubes so that they do not bend and do not touch moving parts (reducer, engine).
4. Combine the halves of the body and gently squeeze them until the latches click. Start at the top (handle).
5. Twisting all screws, but don’t pull over – this can lead to cracks in the plastic.

After assembly:

• 🔋 Connect the mop to charge for 1-2 hours (even if the battery was charged).
• 💧 Pour clean water into the tank and check the leakiness (there should be no leaks).
• 🔄 Turn on the mop and test all modes: water spraying, rotation of the nozzle, backlighting (if there is one).

⚠️ Warning: If the mop does not turn on after assembly, check: Correct connection of the battery power connector. Integrity of the fuse on the board (can burn when shorted). Reliability of the contacts of the power button (sometimes they depart during assembly).

If everything works correctly, your Xiaomi Derma mop is ready for further use!

• 🧼 After each cleaning, wash the nozzle and tank.
• 🔋 Store the mop with a discharged battery (40-60%).
• 💧 Use only distilled or filtered water – this will prevent lime plaque.

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If the mop is unstable after repair (e.g., it spontaneously turns off), the problem is most likely poor connector contact. Disassemble the device again and check the reliability of all connections.

FAQ: Frequent questions about the dismantling of Xiaomi Derma