Disassembly of electric shavers Xiaomi Mijia: a step-by-step guide with photos and tips

Electric Shaver Xiaomi Mijia (models) MJSXJ02YM, MJSXJ05YM And others have become a popular choice because of the balance of price and quality, but even the most reliable device requires maintenance, and over time, knives become blunt, dirt accumulates under the net, and dust enters the mechanism, all of which reduce the efficiency of shaving. You can disassemble the razor yourself in 10-15 minutes, if you know the nuances of the design and avoid typical mistakes.

In this article, you'll find detailed photo instructions, a list of tools you need, and a list of pitfalls that can damage your device if you disassemble it in a careless manner, and we'll look at both basic knife cleaning and a complete body-cleaning for deep cleaning or replacement of parts, and if your razor starts twitching, or if it doesn't cut hair well, or if it makes uncharacteristic sounds, it probably needs maintenance.

What Xiaomi Mijia models can be disassembled independently

Not all Xiaomi razors are equally easy to disassemble, here is a list of models for which this instruction is suitable:

• 🔹 Mijia MJSXJ02YM — classic mesh razor with floating knives (the most common model).
• 🔹 Mijia MJSXJ05YM — Improved version with titanium-coated knives and a more powerful engine.
• 🔹 Mijia MJSXJ08YM — model with an increased capacity battery (2000 mAh) and fast charging.
• 🔹 Mijia MJSXJ11YM — the latest version with a cooling system of knives (disassembly is similar, but requires caution with thermopaste).

Mijia models MJSXJ01QM (rotary MJSXJ03QM (Trimmers are of a fundamentally different design - they do not fit the instructions. It is also not recommended to disassemble razors with a sealed body (usually marked as IPX7), because a leakproofness will lead to moisture entering the mechanism.

Before disassembling, check the serial number on the bottom of the device or in the Mi Home app. If your model is not included in the list, study its design using video parsing on YouTube - some modifications may have hidden latches or non-standard mounts.

Preparation for disassembly: tools and security measures

The Xiaomi Mijia razor doesn't need professional tools, but it doesn't need any tools. Here's the minimum set you'll need:

• 🔧 Plastic mediator (or guitar) - to disconnect the latch of the body without scratches.
• 🔧 Cross screwdriver (size) PH0 or PH00) — knife-block screw.
• 🔧 Tweezers - for extraction of small parts (springs, sealing rings).
• 🔧 Isopropyl alcohol (70%+) — Cleaning of contacts and mechanisms.
• 🔧 Soft brush (for example, for makeup) – to remove dust from hard-to-reach places.
• 🔧 Silicone lubricant (e.g, WD-40 Specialist) - for the processing of moving parts.

⚠️ Warning: Never use metal screwdrivers to unplug plastic latches, it will lead to chips! If there is no mediator at hand, an old bank card or plastic shoulder blade for repairing smartphones will do.

Before the start of the work:

1. Turn off the razor and remove the battery (if the model allows).
2. Take a picture of the location of the parts at each stage – this will help with the reverse assembly.
3. Work on a light and clean surface (for example, on a white sheet of paper) so as not to lose small screws.

Step-by-step: how to disassemble a knife block

The knife unit is the most polluted part of the razor, and it is recommended to clean it every 1-2 months (or after 20-30 uses).

1. Remove the grid block: press the lock button (usually located on the side) and pull the grid up (MJSXJ05YM) the fixator is hidden under a rubber lining - put it under a nail or mediator.
2. Remove the knives: under the net, you will see 2-3 movable knives (depending on the model), pick them up carefully with tweezers and pull them out. Don't make any effort - the knives are attached to magnets or plastic guides!
3. Clear the details: 🧼 Wash the net and knives under warm water with soap (unless the model is afraid of water). 🧴 To remove fat, use isopropyl alcohol. 🪥 Dry the parts with a dryer (cold mode) or leave for 1-2 hours at room temperature.

⚠️ Warning: Do not use abrasives (such as toothpaste) to clean knives - this will damage the titanium coating! Also avoid water entering the engine compartment (even if the razor is waterproof).

After cleaning, apply 1-2 drops of silicone lubricant to the moving parts of the knives (but not the cutting edges!) This will reduce friction and prolong the life of the mechanism. Assembly is done in the reverse order - first the knives are installed, then the mesh before the click.

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If the knives are dull and can not be cleaned, they can be sharpened with a special paste. GOI (It's used to sharpen razor blades. Apply the paste on the glass and swipe the knife 10-15 times at a 30 angle.°.

Disassembly of the body: access to the battery and motor

Deep disassembly is less often required - usually when replacing the battery, repairing the engine or cleaning dust after prolonged use - a process more complicated than disassembling the knife unit and requires care.

Instructions for models MJSXJ02YM/MJSXJ05YM:

1. Remove the back cover: Use the mediator to pull the seam between the top and bottom of the body (start at the junction near the power button). Carefully guide the mediator around the perimeter, disconnecting the latches. There are 6-8 of them.
2. Unplug the battery: Unscrew the 2 screws that lock the battery charge (screws can be under rubber plugs). Unplug the power plume from the main board (don't pull the wires!).

Remove the engine block

• Unscrew the 4 propellers holding the motor (they can be hidden under stickers).
• Carefully lift the block - it is connected to the switch on a thin plume.

⚠️ Attention: In models MJSXJ11YM The engine unit is attached to the heatpaste radiator. When disassembling, do not touch the heatpaste with your hands - it is toxic! Use a new paste to reassemble (for example, Arctic). MX-4).

After disassembly, clean the internal surfaces of dust with a brush, and wipe the contacts with alcohol. If the battery is swelled, immediately replace it (such batteries are dangerous to fire!). For Xiaomi Mijia models, 18650 batteries with a capacity of 1800-2000 mAh are suitable.

Frequent mistakes in disassembly and how to avoid them

Even experienced users sometimes make mistakes that cause the razor to break. TOP-5 The most common mistakes and ways to prevent them:

• 🔧 Too much pressure on the latches → Solution: Use a mediator and heat the body with a hair dryer (60-70)°C) for softening plastics.
• 🔌 Breaking of the switch loop → Solution: fix the plume with tape before removing the engine block.
• 💦 Water entering the engine compartment → Solution: Dry parts separately and avoid direct contact with water.
• 🔋 Short circuit when connecting the battery → Solution: Check polarity before connecting!
• 🔄 Improper assembly of the knife block → Solution: Watch out for the magnetic poles (usually marked with paint).

If the razor does not turn on after assembly, check:

1. The polarity of the battery (plus / minus must match the marking on the board).
2. Integrity of the plug of the power button (if damaged, you can temporarily close the contacts with tweezers for the test).
3. Battery charge (plug in the charger for 10-15 minutes).

Cleaning and lubrication: how to prolong the life of a razor after disassembly

Disassembly is only half the battle, and to make the razor last longer, you have to lubricate the mechanism properly after cleaning.

1. Cleanup: 🧹 Remove dust from the body with a brush or vacuum cleaner (at minimum power). 🧴 Wipe the boards and contacts with a cotton swab soaked in isopropyl alcohol.
2. Lubricant: 🛢️ Apply 1 drop of silicone lubricant on the axles of the knives (not on the cutting edges!). 🛢️ For the motor unit, use lithium lubricant (for example, Liqui Moly Thermoflex) - 1 drop per shaft of the engine.

Verification

• 🔄 Hand-scroll the knives - they should rotate smoothly, without jamming.
• 🔊 Turn on the razor for 10 seconds - there should be no extraneous noises (squeaking, coding).

⚠️ Attention: Do not use WD-40 or other penetrating knife lubricants - they are aggressive to plastic and rubber seals! Also avoid vegetable oils (sunflower, olive) - they quickly oxidize and thicken.

For models with cooling system (MJSXJ11YM) After lubrication, check the fan: hold the razor to your ear - you should hear a uniform flow of air. If the fan is not working, clean its blades with compressed air (keyboard cleaner).

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Regular cleaning and lubrication of the knife unit increases the life of the razor by 30-50%, the optimal frequency of maintenance is every 3 months or after 50 use.

Where to buy parts for Xiaomi Mijia and how much it costs

If you find faulty parts, you can replace them yourself, here are the estimated prices for spare parts (2026) and where to buy them:

When buying spare parts, pay attention to:

• 🔍 Compatibility with model – for example, knives from MJSXJ02YM not fit for MJSXJ05YM.
• 📦 Set - in the set should be all fastening elements (screws, springs).
• 🌍 Origin – original parts are sold in Xiaomi branded stores or at official dealers.

If you are not sure about the choice, order spare parts through AliExpress marked "For Xiaomi Mijia" MJSXJ02YM" — For batteries, check the dimensions (diameter 18 mm, height 65 mm) and capacity (not lower than 1800 mAh).

FAQ: Answers to Frequent Questions