Owning Xiaomi smart gadgets means not only usability, but also the ability to self-maintenance equipment. Electric corkscrew, often released under the brand name Mijia or Pinztea, is a popular accessory for wine connoisseurs. However, over time, even a quality device may require interventions: reducing battery capacity, jamming the mechanism or the need for deep cleaning after spilled wine.
Disassembling this device on its own is not an easy task, because the manufacturer does not initially provide easy access to the insides. The case is assembled tightly, often without visible screws, which requires specific approach and accuracy. In this article, we will look at the dismantling process in detail, identify hidden fasteners and explain how to avoid damaging fragile plastic latches.
Before you start to act, you need to understand the risks. Inside the device is a lithium-ion battery, another gearbox. Sloppy handling of metal tools can lead to short circuit or mechanical destruction of gears. The main difficulty of disassembly is that the top cover is often planted on a powerful industrial adhesive, rather than screws.
Workplace preparation and necessary tools
Quality diagnostics and repairs start with the right organization of space. You need a clean, well-lit table to keep the small cogs and springs out of your hands. Light should fall evenly without creating glare on the glossy surface of the case, allowing you to see the microscopic gaps between the parts.
The toolkit should be specialized. A conventional cross screwdriver will not work here, since screws are often hidden or have a custom hat. To work with adhesive joints and tight fits, thin plastic blades are needed that will not scratch the matte coating of the case.
- 🔧 Precision screwdriver set (PH000, PH00) micro-screw.
- 🛠 Thin metal blade or mediator for lids.
- 🔥 Hair dryer or heating platform for softening the glue (temperature not higher than 80)°C).
- 🧤 Antistatic gloves and tweezers for extracting small details.
Pay special attention to safety. When working with the battery, there is a risk of damage to the battery with a sharp tool. If you smell the electrolyte or see bloating, immediately stop working and ensure that the room is aired.
⚠️ Warning: Be sure to completely discharge the device before disassembly begins. Working with a charged battery under voltage increases the risk of short circuit in case of accidental damage to the insulation of the wires.
Design analysis and search for hidden fasteners
Visual inspection of the case is a critical step, and many users make the mistake of picking the case where there is no fastener, leaving traces of opening. Xiaomi's electric corkscrews are usually modular: the bottom with the motor, the center with the rod mechanism and the top decorative cover.
Carefully examine the bottom end of the device. Often, under a rubber leg or decorative pad, the screws that hold the entire structure are hiding, and it is also worth checking the area around the LED indicator - sometimes it is part of the fastening system.
If there are no visible screws, then the body is assembled on latches and adhesive layer, in which case heating is the only safe way to soften the adhesive. Don't try to separate the parts by force, the plastic can crack at the most inopportune moment, making further assembly impossible.
For an understanding of internal architecture, it is useful to check the table of the main components that you will find inside:
| Component | Function | Risk of damage |
|---|---|---|
| Li-Ion battery | Powering the engine | High (bloating, KZ) |
| Planetary gearbox | Transfer of torque | Medium (tooth scraping) |
| Micro-switch | Start/Stop work | Low (contact break) |
| Management fee | Control of charge and motor | High (static, moisture) |
The process of opening and dismantling the hull
We start the immediate disassembly. If you find the screws at the bottom, unscrew them and gently pull the bottom. If there are no screws, turn on the hair dryer and warm the joint between the top and bottom of the case evenly for 2-3 minutes. Keep the hair dryer at a distance of 5-7 cm, constantly moving it so as not to melt the plastic.
Once heated, insert a thin plastic card or a spatula into the gap. Move around, gradually increasing the gap. You will hear the characteristic click of snapping locks. Act slowly, as inside the lid may be soldered to the LED wire or button.
☑️ Postmortem readiness
When the body is open, you'll see the interior layout, normally the motor and gearbox are attached to a metal or plastic glass, you may need to disconnect the plume or soldering to remove the motor, and remember or photograph the position of the wires so that you don't confuse polarity when you build it.
⚠️ Warning: Never pull the wires connecting the board to the buttons or the engine. First find and unplug the connector, otherwise you will break the thin veins, and recontacting will be extremely difficult.
Battery replacement and battery maintenance
The most common reason for disassembly is loss of capacity. Inside, a standard 18650 cylindrical element or a flat lithium-polymer unit wrapped in shrinkage is usually installed. Note the label: voltage should be 3.7V, and capacity varies from 600 mAh to 1200 mAh.
To replace, carefully solder off the old element, observing the temperature regime of the soldering iron, so as not to overheat the board. The new battery should have welded contact tapes (nickel strips), since you can not solder directly to the battery body - this can cause an explosion. Use spot welding or carefully solder tape to existing conclusions.
Where can I find a new battery?
Once you have installed a new cell, check the voltage with a multimeter. It should be in the operating range. If you see a deep discharge below 2.5V, the new battery may not work without first "pumping" a special charger.
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When replacing a battery, it is critical to keep the original BMS if it is handed out separately, or to use a battery with built-in overdischarge protection.
Cleaning the gearbox and lubricating the mechanism
If the corkscrew starts to hum, but it doesn't spin, or it's working in jerks, the problem is the mechanical part, and inside is a planetary gearbox that consists of several gears, and over time, the factory lubricant dries or mixes with the dust and the wine residue, turning into an abrasive.
Take the gearbox apart, carefully removing the gears one by one. Wash all the plastic and metal parts in isopropyl alcohol or Kalosha gasoline. Remove all the old dirt with a soft brush. Examine the gear teeth for chips — if there is damage, the mechanism will have to be changed completely.
For lubrication, only use plastic lubricants, such as lithium or silicone-based lubricants, thick graphite lubricants or oils like WD-40, which will destroy the plastic, and apply a thin layer of lubrication to the gear teeth and the rotation axes.
- 🧼 Wash the parts with alcohol for degreasing.
- 🔍 Check the gears for cracks.
- 🛢 Grease the rubbing surfaces with silicone lubricant.
- 🔄 Collect the gearbox in reverse order, checking the ease of movement.
Device assembly and testing
The final step is assembly. Make sure all the wires are packed into their channels and not be clamped by the body. When you connect the halves of the body, first close the latches on one side, then gently press the perimeter until the characteristic click. If you used the glue, let it dry completely under the load for a few hours.
Once assembled, connect the device to charge. The indicator should light up, signaling the charge process. Let the device charge fully before making the first test run without a plug. This is necessary to calibrate the charge controller.
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When assembling the case, use a thin layer of double-sided electronics tape instead of superglue, which will allow you to easily open the device in the future for re-wiping or battery replacement.
So, if you do a test spin in a soft plug, the motor should run smoothly, without any extraneous vibrations, and if the device makes strange noises, you may have assembled the gearbox incorrectly or squeezed the power wire.
⚠️ Warning: If the device doesn't turn on after assembly, don't disassemble it immediately. Check the charger and the cable. Often the problem isn't the repair, but the oxidized contact of the charging port that might have left during assembly.