Xiaomi electric shavers S300 It's become popular because it combines affordable prices, compact sizes and efficient operation, but over time, even the most reliable technology requires maintenance, like cleaning knives, replacing nets, or repairing internal components. Disassembling the device can seem like a daunting task, especially if you have never held a screwdriver for small electronics. This article will help you avoid typical errors and conduct the procedure as carefully as possible.
It is important to understand that dismantling the razor violates the manufacturer's warranty. If your device is still in warranty service, you should contact the service center. However, if the warranty has expired or you are confident in your abilities, our guide will explain in detail how to disassemble Xiaomi. S300, Without damaging the plastic latches and the internal contacts, we'll also uncover the secrets of building the right thing so that the razor after maintenance works like a new one.
Preparation for disassembly: tools and precautions
Before you start dismantling, prepare the workplace and the necessary tools, and use an antistatic mat to avoid damage to electronic components by static electricity.
- ✅ Plastic dismounting blades (2-3 (a) - for the careful separation of the body without scratches.
- ✅ Cross screwdriver PH00 — for the mounting screws of the body (usually their 4-5 piece).
- ✅ Tweezers with curved ends – for extracting small details, such as spring contacts.
- ✅ Alcohol wipes – to clean contacts and internal surfaces from dust and fat.
- ✅ loope USB-Microscope – helps you see small details and avoid losing them.
Pay special attention to the battery. - Xiaomi S300 It has a 600 mAh lithium battery, which, if handled carelessly, can be a source of danger, and never puncture the battery or put it under mechanical stress, which can cause fire or explosion. If the battery is swollen, it is better to trust the professionals to disassemble.
⚠️ Warning: Before disassembling, be sure to discharge the razor until it is completely turned off (the charge indicator will go out) or remove the battery if you have experience with electronics.
Also, make containers for small parts -- cogs, springs and plastic fixtures are easily lost, you can use a magnetic mat or split-up screw boxes, and you can take a picture of each stage of the dismantling, which will help you put the razor back together properly.
Xiaomi's device diagram S300: What's inside and why you need to know.
To properly disassemble a razor, it is useful to understand its internal structure. - Xiaomi S300 consists of several key modules:
- The top knife unit is a removable section with nets and movable blades, and it fastens to the body on the latches.
- The case with the power button is a plastic shell, inside which the control board and the battery are located.
- Electronic module – includes a control chip, a vibration motor and charging contacts.
- A battery is a lithium-polymer battery soldered to a board or connected through a connector.
Below is a simplified layout of the main elements:
| Component | Location. | Features |
|---|---|---|
| Mesh knives | Upper part | Fasten on. 2-3 Plastic fixtures require careful removal |
| Management fee | Under the switch | Contains a microcontroller and transistors for motor control |
| vibratory motor | Central part of the hull | Payed to the board, responsible for the movement of knives |
| Battery | Lower part of the hull | Capacity 600 mAh, voltage 3.7V, maybe glue |
| Charging contacts | Base of the hull | Spring contacts, often oxidized over time |
Knowing where the parts are will help you avoid damage, for example, plastic grid locks are very fragile, if you pull them with effort, they can break, and the same applies to spring charging contacts: they are easy to bend if you do not carefully remove the bottom cover.
What if the razor does not turn on after disassembly?
Step-by-step: how to disassemble the case Xiaomi S300
Now, to the process itself, follow the instructions strictly by step, so that you don't miss important details.
Step 1: Removing the upper block with knives
1. Make sure the razor is off and off-charging.
2. Take the razor by the body and gently pull the top block with grids up and slightly to the side (usually in the direction opposite to the on button).
3. If the block does not respond, put a plastic blade on the side where the locks are located.
Don't use excessive force, the locks can break. If the block doesn't get removed, make sure it's snapped with an extra lock (some versions have a hidden latch under the button).
Step 2: Untwisting the hull screws
1. Turn over the razor and remove the lower cover (it usually holds on to the razor). 2-3 latch).
2. You'll see under the lid. 4-5 screw PH00. Carefully unscrew them, fold them in a separate container.
3.Please note: one of the screws may be hidden under the sticker - it must be carefully tampered with and removed.
If the screws don't unscrew, don't try to apply more force - it can rip the slits off. Use a drop instead. WD-40 or heat the body with a hair dryer (not higher than 60)°C) to dissolve possible corrosion.
Step 3: Separation of the hull
1. After removing the screws, insert the plastic blade into the gap between the halves of the body (start from the side of the switch button).
2. Carefully drive the shoulder blade around the perimeter, disengaging the latches. You will hear the characteristic clicks.
3. Take your time - if the body does not disconnect, check if all screws are unscrewed.
Inside, you'll see the motor board, the battery and the button plume. Don't pull the plumes, they're fragile and they can come off the board.
Disconnected from charging.|Battery discharged (or removed)|Tools and containers for screws prepared|The original look of the insides is photographed|The workplace is lit and free from foreign objects-->
Cleaning and maintenance of internal components
After the disassembly, it's time to do the cleaning. - Xiaomi's main problems S300 post-extensive:
- 🔹 Hair-cluttered nets of knives - reduce the effectiveness of shaving.
- 🔹 Oxidized charging contacts – lead to poor contact and slow charging.
- 🔹 Dust inside the body - can block the movement of the motor.
- 🔹 Dry lubrication on moving parts - increases noise and wear.
To clean the nets, use a special brush (complete with a britva) or a soft toothbrush soaked in alcohol. Don't use metal objects - they can scratch the netting. Charging contacts clean with a cotton swab dipped in isopropyl alcohol.
If the engine is running noisily, apply 1-2 There's a drop of silicone lubricant on its axis. WD-40 Or other aggressive compounds, which can damage plastic parts, and a compressed air canister is suitable to remove dust from the case (use at minimum pressure so as not to damage small parts).
⚠️ Note: If you notice corrosion on the board or battery, do not try to clean it mechanically.It is better to contact the service - corrosion can indicate moisture, which requires professional diagnosis.
After cleaning, allow all parts to dry completely (at least 30 minutes) before assembly, which is especially important if you have used liquids to clean the contacts.
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If the nets of knives are badly worn, they can be replaced with new ones.Original spare parts for Xiaomi S300 narcotical MJSXJ03WM (2-grid + blade).
Replacement of the battery: when and how to carry out
Battery in Xiaomi S300 calculated 300-500 It's charging cycles, and then it starts to drop markedly:
- ⚡Britwa discharges for 5-10 minutes of work (normally) 40-50 minute).
- ⚡Charging takes more 4-5 hours (normally) 1.5-2 hour).
- ⚡Britva spontaneously shuts down even at the shown level of charge.
- ⚡The battery swelled (seems to deform the body).
To replace the battery, you will need a new battery. 3.7V 600mAh connector JST 1.0 (or soldered wires if the battery is not removable) Replacement process:
- Disconnect the old battery from the board (neatly tweez the connector or unfurl the wires).
- Install a new battery while observing polarity (+ ce +, − ce −).
- If the battery is glue-on, use isopropyl alcohol to remove the glue residue.
- Secure the battery on bilateral tape or a drop of heat glue (do not overdo it - the glue should not get on the contacts).
After replacing the battery, be sure to carry out 2-3 It's a full charge-discharge cycle to calibrate the battery controller, which will extend the life of the new battery.
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If you're not sure about your soldering skills, you should buy a battery with a ready-made connector. 30 Wh, and the rationing time is nothing more. 2-3 Seconds to avoid overheating the charge.
Common Mistakes in Disassembly and How to Avoid Them
Even experienced craftsmen sometimes make mistakes that can put a brit in disarray, and here are the most common ones:
| Mistake. | Effects of consequences | How to avoid |
|---|---|---|
| Too much pressure on plastic latches | Cracks or broken body locks | Use plastic blades and heat the body with a hairdryer (up to 50)°C) for softening plastics |
| Loss or entanglement of screws | Uneven fit of the body, backlashes | Folding screws into signed containers or photographing their location |
| Moisture on the board | Short circuit, corrosion of contacts | Use alcohol wipes, avoid water solutions |
| Incorrect polarity when connecting the battery | Failure of the charging controller | Check the markings + and − board-and-battery |
| Use of metal tools to remove nets | Scratches on nets, dumb blades. | Use only plastic or wooden blades |
Another common problem is incomplete assembly, such as forgetting to plug the button plume or loosely fixing the motor, which causes the brit to vibrate poorly, so to avoid this, follow the reverse disassembly order and check the photos taken during the dismantling phase.
If the britva is unstable after assembly (for example, it spontaneously turns off), check:
- 🔧 Density of the battery contacts.
- 🔧 Integrity of the plug of the switch.
- 🔧 Absence of foreign objects inside the body (cogs, pieces of plastic).
Razor assembly: procedure and final inspection
Assembling Xiaomi S300 It should be in reverse order, but with some nuances:
- Set the motor board to the bottom of the case, making sure all plumes are connected.
- Secure the battery, check the polarity and reliability of contacts.
- Reconcile the halves of the body, starting at the on button side. Make sure all latches are in place (you should hear clicks).
- Twirl the screws cross-cross to avoid skewing the body.
- Install the top block with grids by pressing until the characteristic snap of the locks.
After assembly, perform a test check:
- Connect the britva to charging on 10-15 Check if the indicator is on for a minute.
- Turn on the britva and listen to the engine - there should be no extraneous noises or vibrations.
- Check the density of the mesh fittings - they should not backfire.
If everything is working properly, the britva is ready to use. If you have problems (for example, it does not turn on or a bad shaving), take it apart again and check the problem nodes.
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After assembly, do not wash the britwo under running water for 24 hours - this is the time it takes to completely dry out possible moisture residues inside the case.