Modern electric razors from Xiaomi and sub-brand Mijia are renowned for their reliability and stylish design, but their tightness often leaves users baffled when maintenance is needed. Owners often wonder how to open Xiaomi's razor without damaging the body to replace cutting blocks or conduct a deep cleaning of accumulated bristles and skin oil. These devices are designed to withstand moisture, so there are no obvious screws or latches that can be easily warded away with a nail.
In this guide, we will take a closer look at the process of dismantling popular models such as the S500, S500C and S700. You will learn where the locking elements are hiding and what tools are really needed for safe disassembly. Attention: self-opening the device can lead to loss of warranty, so only proceed with the procedure if you are confident and the gadget is no longer in warranty service.
The challenge is that the manufacturer doesn't have to be disassembled by the user on a regular basis, but knowing the internal mechanisms will help extend the life of your device, and we'll look at the vibratory motor and magnetic mountings that are characteristic of the brand's technology.
Preparation of the workplace and necessary tools
Before you start dismantling, you need to organize a safe space. You need a clean, well-lit surface, preferably covered with soft material, so that small parts do not roll and scratch. The main tool for most models will be a small cross screwdriver (usually the size of a PH0 or PH00) and a plastic blade (poodger) to open the case without damage.
It's also good to have a tweezer with thin tips and perhaps a hair dryer to warm up the adhesives carefully if the model suggests they're there. In some cases, especially with older or more specific modifications, you might need a suction cup to remove the back cover. Remember that there are sharp blades inside, so be careful.
⚠️ Warning: Before starting any work, be sure to disconnect the razor from the charger and make sure it is completely off.
To collect screws, it is better to use a magnetic mat or a small container with sections, since fasteners in Xiaomi equipment are often microscopic in size and easily lost. If you plan to clean, prepare isopropyl alcohol and a soft brush as well.
Disassembly of the mesh block and removable heads
The first step that is available to every user is to remove the cutting unit. The S500 and S700 series use a quick-removal system. To remove the net, you need to carefully pull it or press the special locks on the sides, depending on the specific modification, and it is important not to make excessive efforts to avoid breaking the plastic guides.
When the outer grid is removed, the internal rotor mechanism is accessed. In some models, such as the Mijia S500C, the cutting unit itself is attached to magnets or light friction. Carefully remove it, trying not to drop small blades. If you plan to just clean the device, this step may be enough to remove the bulk of the contaminants with a brush.
- 🛠️ Remove the protective net by pulling on special ears or pressing on side fixers.
- 🔄 Remove the rotary knife by gently pulling it up or sideways.
- 🧹 Clean the inside of the head of hairs and dust with a dry brush.
- 🔍 Check the grid for microcracks that may have occurred during operation.
If your goal is to replace knives, make sure you buy original components, as the geometry of Xiaomi blades is specific. Once you install new components, assemble the unit in reverse order, making sure that all elements fall into place without skewing.
Dismantling the main body and access to the battery
More in-depth interventions, such as battery replacement or engine cleaning, require opening the main body. Most Xiaomi models have access to the insides from the charging port or through the bottom of the handle, often with screws hidden under a decorative cap or rubber pad that needs to be gently tucked into a thin tool.
Once you unscrew the visible screws, the body may not disintegrate immediately, because of the presence of hidden plastic latches around the perimeter, use a plastic card or shoulder blade to slowly walk along the junction of the halves of the body, hearing the characteristic clicks. Do not use metal objects, as they can leave deep scratches on the glossy plastic or damage the internal wiring.
Hidden screws under the sticker
Inside, you'll see a battery pack, usually encased in shrinkage, and a PCB. Be very careful with the wires that go to the board, which are very thin and easily break when you're not handling it carefully. If you change the battery, solder the old cell and solder the new one, keeping it polar.
Features of the design of the S500 and S700 models
The S500 and S700 have their own design features that are important to consider when disassembling. The S500 often uses a modular system where the engine and battery can be combined into one unit. Disassembly here requires special attention to sealing rings that ensure water resistance of the IPX7 level.
The S700, which has ceramic blades and a more powerful motor, may have a more complex head attachment system, and it is important not to confuse the assembly order, as improper installation can lead to increased noise or vibration, and this model often features an additional weight unit for balance, which is attached to the glue.
When working with these models, it is critical to preserve the integrity of the silicone gaskets. If the gaskets break or lose their elasticity, the razor will no longer be waterproof, and it will become dangerous to wash them under the tap, and if the gaskets are damaged, they should be replaced with a gaskets that are similar in thickness and diameter.
Cleaning of internal machinery and maintenance
When the body is opened, it opens up the possibility of cleaning the internal machinery properly, and during operation, fine dust, skin microparticles and lubricants can accumulate inside, which adversely affects the operation of the motor, and use compressed air or a soft brush to remove contaminants from the board and windings of the engine.
Pay special attention to the shaft of the engine. If it has a plaque, carefully remove it with a cotton swab dipped in isopropyl alcohol. After cleaning, it is recommended to lubricate the rubbing parts with a special silicone lubricant, but you need to do this very dosed so that the lubricant does not get to the electrical contacts.
☑️ Checklist of service
Remember that aggressive chemicals can break down plastic or damage the labeling on parts. Use only neutral cleaning agents. Once cleaned, let all parts dry completely before assembly.
Comparison of the complexity of disassembling different models
Different Xiaomi razors require different approaches to disassembly, and below is a table that will help you assess the complexity of the procedure for different devices.
| Model | Head attachment type | Difficulty opening the hull | The presence of hidden screws |
|---|---|---|---|
| Mijia S500 | Magnetic/Lacks | Medium | Yeah (under dummy) |
| Mijia S700 | Latchers | Tall. | Yes (multiple) |
| Soocas S3 | Threaded | Low. | No. |
| Mijia S100 | Latchers | Medium | Yes (1-2 pcs) |
As you can see from the table, the S series models require a more delicate approach due to the presence of hidden mounting elements. Simple models like the S100 or Soocas counterparts often have a more traditional design that is easier to service at home.
⚠️ Warning: When assembly, make sure that no wire is squeezed between the halves of the body, which can lead to a chain break or damage to the insulation and subsequent short circuit.
Assembly of the device and check of performance
The assembly is done in the exact opposite order, first the battery is installed and connected to the board, then the board is stacked, and only then the halves of the case are connected, make sure that all the plumes and wires are packed into their channels and do not interfere with the closure.
When connecting the halves of the body, press evenly around the perimeter until all the latches click. If you used the glue to fix, let it dry completely according to the instructions on the tube before turning on the device. After assembly, be sure to check the tightness, at least visually assessing the density of the parts.
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Before you finally snap the case, try briefly turning on the razor by connecting the contacts of the battery. This will help make sure that you do not mix up and the device works.
Turn on the device and listen to the engine. A knock, creak, or excessive vibration may indicate that the rotor is not properly installed or that a foreign object has entered the vehicle. If it has been successful, install the cutting unit and wipe the body with a soft cloth.
Frequent mistakes in self-disassembly
One of the most common mistakes is to use excessive force, and if a part doesn't go, you've missed something, like not twisting a hidden screw or bend the latch, and trying to "solve the matter by force" almost always causes plastic mounts to break down, which can't be repaired anymore.
Another mistake is ignoring the condition of the seals. After assembling a razor without checking the rubber bands, users wonder why the device stopped holding charge or rust appeared inside a month later. Moisture is the main enemy of electronics, and the tightness in Xiaomi razors plays a key role.
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The main principle of successful disassembly is patience and lack of haste. It is better to spend an extra 10 minutes searching for a hidden screw than to break the case.
And also, remember to mark screws, if you're twisting screws of different lengths from different locations, spread them out in the order you took them out, or photograph the process, and twisting a long screw into a short hole can break through the body or damage the internal components.