DIY Chinese electronic watch repair

Description of electronic clock repair Janus, made in the USSR. The basis of these watches is the K145IK1901 microcircuit - a common Soviet controller for building electronic clocks. The time is displayed on the large green display IVL1-7 / 5. Based on the experience and repair of such watches, it can be concluded that most often the quartz resonator fails, the electrolytic capacitors dry out, and the vacuum indicators fade away. Indicators that failed due to a burnout of the filament have not yet come across. Of course, it is best to repair any electronics with a circuit. Here are two similar schemes. If anything, the K145IK1901 and KR145IK1901 microcircuits are interchangeable during repairs.

• SB1 - “M” - setting the current time in minutes, in the “T” mode - in seconds;
• SB2 - “H” - setting the current time in hours, in the “T” mode - in minutes;
• SB3 - "К" - correction of the current time;
• SB4 - "C" - stopwatch mode;
• SB5 - “О” - stop indication;
• SB6 - “T” - timer mode;
• SB7 - “B1” - “alarm clock 1” mode, the time is set using the “H” and “M” buttons.
• SB8 - “B” - call the indication of the current time, for example, after setting alarms;
• SB9 - “B2” - “alarm clock 2” mode.

In this case, the watch lay idle for a long time and finally, after 5 years, it was needed. Initially, there was an idea to buy ready-made LEDs - with large numbers, 5-10 centimeters high. But after looking at the price for 1000 rubles, I realized that it was better to revive the old ones.

We disassemble the case and examine the circuit with details - everything is quite complicated, compared to modern ones, on microcontrollers and LCDs. The power supply seems to be simple - transformerless, but then a reduced voltage of 10 V is converted by a very cunning inverter on a multi-winding ring, into 27 volts of power supply for the anode of the IVL-1 indicator.

There are no signs of life, the fuse and diodes are normal, but the power supply to the filter capacitor (1000 microfarads 16 V) is only 4 volts.

We take a laboratory regulated power supply unit and supply the clock with the 10 V voltage set according to the scheme, controlling the current. Everything worked - the indicator lit up and the dot of seconds began to blink. The current was about 80 mA.

Obviously the problem is in the capacitor. And the culprit was not the electrolyte of the filter, as you might immediately think, but the ballast network, which has almost lost its capacity, at 400 V 1 microfarad. In parallel, a second similar one was soldered to it, and when it was connected to the 220 V network, the device worked. The voltage immediately rose to 10.4 V.

On this, the repair can be considered complete, and 1000 rubles already allocated for the purchase - saved. From this we conclude: do not be lazy to repair household appliances and electronics on your own, because in addition to saving money on buying a new one, you will feel joy from a job successfully done and pride in front of your household 🙂

This is the name of a wrist electronic-mechanical watch with a quartz generator (Fig. 9).

Rice. 9. Kinematic diagram of a quartz watch KNCH 3050:

9 - central wheel with a tube;

10 - stepper motor rotor;

11 - stepper motor stator;

12 - stepper motor tribe;

14 - second wheel with tribe;

19 - transfer lever with a pin;

The crystal oscillator is a highly stable oscillation source located in the electronic unit.

The block of a quartz generator is a printed circuit board with a quartz resonator, an integrated microcircuit and passive elements placed on it. The block is connected to the plate with screws.The actuator in the watch is a stepper motor made in the form of an autonomous unit. The battery provides at least 12 months of continuous operation of the watch.

The principle of operation and the kinematic diagram of the clock are as follows: the electrical signal of the quartz generator is divided by its frequency and, after the formation of the pulse, is fed to the stepping motor. The pulse repetition rate is 1 Hz. The stepper motor, in turn, converts successive electrical impulses into intermittent rotation of the main wheel system.

Through the wheel system, the rotation of the engine shaft is transmitted to the arrows and the calendar device (if any).

The stepper motor arm (12) meshes with the transfer wheel (13), the arm of which drives the second wheel (14). From the tribe of the second wheel through the intermediate wheel (15) with the tribe, rotation is transferred to the central wheel (9). The pointer mechanism consists of a minute hand tribe (8), a bill wheel (6) with a tribe, an hour wheel (7).

The conversion shaft (2) with the head (1) can take two fixed positions. If the watch has a calendar device, then the conversion shaft will be designed for three positions.

In order to translate the arrows, it is necessary to put the conversion head in the second fixed position. In this case, the cam clutch (17) must engage with the shifting wheel (16). Further, the rotation is transferred to the switch mechanism.

During the translation of the arrows, a locking lever, mechanically connected to the translation shaft, locks the translation wheel and prevents the movement of the wheel system and the stepper motor when moving the arrows. After setting the arrows and returning the conversion head to the initial position, the lever returns to its normal position, allowing the stepper motor to start.

Unscrew the locking ring and remove the housing cover.

Unscrew the battery spring screw, remove the spring and carefully, preferably with tweezers, pull out the element, taking it only by the cylindrical part of the body.

Next, unscrew the screws connecting the stepper motor, be sure to hold the ends of the conductors with tweezers.

Insert the battery into the mechanism and use a tester to check the functionality of the electronic unit.

The positive probe of the tester is connected to the platinum of the clock mechanism, and the negative one is connected in turn to the connection pins of the stepper motor. In this case, the arrow of the device should deviate to 1.4–1.5 V and oscillate within 1–2 mm with an interval of 2 s. If there are no such fluctuations, replace the electronic unit.

Then determine if the stepper motor is working properly. To do this, set the tester switch to the resistance measurement position.

Connect the tester probes to the contacts (outputs) of the stepper motor and measure the resistance of the coils, which should be within 3-4 kOhm.

Connect one tester probe to the clock plate, and the other to one of the stepper motor leads.

In this case, the arrow of the device should be in the left extreme position of the scale of the device. Repeat the same with a different conclusion. If, when measuring, the arrow deviates to the right, it means that the stepper motor coil is closed to the case. Such an engine must be replaced.

Remove the electronic unit. To do this, unscrew the screw securing the current lead, remove the insulating washer, unscrew the two screws securing the block to the plate, carefully lift the block with tweezers, move it to the side and remove it from the speakers.

Press on the support of the transfer shaft, pull the shaft out of the housing, and then the entire mechanism.

Remove the screws securing the stepper motor bridge. Remove the bridge, then remove the two screws securing the stepper motor and carefully pull out using tweezers.

When removing and installing the stepper motor, use only brass tweezers and only plastic tweezers for the power supply.

Next, disassemble the switch mechanism.To do this, it is required to remove the hands, two screws of the dial, the dial, three screws, the bridge, the hour, the bill and the transfer wheel and the tribe of the minute hand. Then remove the calendar device, if present.

Disassemble the main wheel system. To do this, unscrew the screws and remove the bridge.

After disassembling the mechanism, cleaning the parts follows. All parts are washed, except for the power source, stepper motor, dial, case glasses, inserts, quartz generator block and painted hands. All of these parts, except for the stepping motor, are cleaned with a soft hair brush.

Install the central wheel with tube (9), minute hand tribe (8).

Press the central tube into the hole of the minute hand tribe, then check the smooth rotation of the central wheel, as well as its axial and radial clearances. Lubricate all center tube seats.

Assemble the wheel system. This is done in the following order: install the intermediate wheel (15) with a tribe, the transmission (13) and second (14) wheels with tribes and the axle of the main wheel system so that the brake of the locking lever enters the axle groove, fasten the axle with screws. Check the clearances of the intermediate and second wheel with tribes and the smoothness of the rotation of the system.

Assemble the translation mechanism. To do this, you need to install the transfer lever (19), the clutch lever and the cam clutch itself (17), as well as the transfer shaft (2).

Check the smooth rotation of the shaft in the plate, install the locking lever and lubricate all parts.

Install the minute wheel with tribe, transfer wheel, axle and fix it with screws.

Install the clock wheel (7).

Install the spring washer and dial. Screw down the dial with the screws and then install the hour, minute and second hands. In this case, it is necessary to monitor the position of the transfer shaft; when installing the hour and minute hands, the shaft must be in the position of the transfer of the hands.

Using the transfer shaft, move the hands to number 12 and set the second hand, matching its position with the divisions of the dial.

The minute, second and hour hands should be set without applying great force so as not to violate the established vertical clearances in the main wheel system.

Insert the mechanism, the mechanism fastening ring, the transfer shaft into the housing.

Install crystal oscillator block, stepper motor and power supply. Do not overtighten the stepper motor mounting screw.

Close the housing cover. After completing the assembly, the stepper motor should immediately start its work, this will be seen by the movement of the second hand.

Oversized quartz watch

As an example, we will consider the mechanism of an electronic mechanical table clock with a quartz resonator (Fig. 10).

Rice. 10. Structural diagram of quartz watch "Yantar" 59206:

3 - gearbox mounting nuts;

6 - screws for fastening the stepper motor;

7 - stepper motor tribe;

8 - screws for fastening the coil;

17 and 19 - intermediate wheels first and second;

22 - screws for fastening the electronic unit

The mechanism consists of a stepper motor, a main wheel system, a battery and an electronic unit.

The quartz clock generator starts working when the batteries are connected to the electronic unit. A stepper motor (9) is used to convert electrical energy into mechanical energy. From the tribe (7) through the first intermediate wheel (17) rotation is transmitted to the second wheel (20). There is a second hand on the axis of the second wheel. In order to set the minute hand in motion, the rotation is transmitted further through the second intermediate wheel (19) and the central wheel (15), on the sleeve of which the minute hand is fixed.

The movement from the central wheel is transmitted to the bill wheel (10), and from there to the hour wheel (12). The center wheel assembly is equipped with a special device that allows the minute and hour hands to be coordinated.To set the exact time and translate the minute and hour hands, a conversion shaft (14) is used.

To set the second hand to the exact time, use the second hand stopper (5).

Remove the cover and pull out the battery and terminals.

Remove the electronic unit (21); to do this, firstly, unscrew the two screws (22) securing the electronic unit in order to disconnect it from the speakers of the panel (13) and the bridge (4); secondly, disconnect the electrical connector.

Remove the stepper motor (9); to do this, unscrew the two screws (6) securing the stepper motor to the panel columns.

Unscrew the two nuts (3) securing the gearbox.

Remove the rear axle (4), second wheel (20), first (17) and second (19) idler wheels.

Remove the second hand stopper (5), front axle (18), center wheel (15), bill wheel (10), hour wheel (12).

Remove the spring (16) and the transfer shaft (14).

Remove the speakers (11) by unscrewing the two nuts securing the speakers to the front side of the panel.

Disassemble the stepper motor if necessary. To do this, remove the stepper motor rotor assembly, unscrew the two screws securing the coil and remove it. After disassembly, all parts of the stepper motor and gearbox, except for the coil, must be rinsed in gasoline. To flush the rotor axis of the engine, you need to remove the coils and the rotor, and the flushing itself should be carried out with the assembled magnetic circuits.

The main malfunction of a stepper motor, as a rule, is a break in the coil wire. In this case, repair is possible only if the outer end of the wire is cut off. The repair procedure is as follows: dissolve the coil varnish with amyl acetate near the broken end so that there is enough length to stretch the wire. Then use a soldering iron to remove the remaining wire from the terminal. Make 2-3 turns around this terminal and re-solder the wire.

Soak the brush in a mixture of alcohol and gasoline and clean the soldered area, and then cover it with varnish.

The most common faults in the electronic clock unit are the failure of the integrated circuit and the quartz resonator. These nodes are best replaced.

Defects in the main wheel system are corrected in the same way as in a mechanical watch.

Assembling and adjusting the watch mechanism

Install two columns (11). Place the spring (16) on the right column and fix its position with the stand pin. Then put the front axle (18) on the same column; the bend of the spring must fit into the groove of the bridge.

Insert the first intermediate wheel (17) into the axle hole with the tribe up. Put a washer and a spherical spring on the second wheel axle (20) and also insert the second wheel into the hole in the bridge.

Raise the second wheel slightly and install the second intermediate wheel (19) and stopper.

Install the rear axle and tighten the two nuts.

Place the main wheel assembly on the rear axle. Place the minute wheel on the front axle tube, and fix the transfer shaft (14) in the holes of the front and rear axles.

Put the bill wheel on the axle of the front axle, and the hour wheel on the hub of the minute wheel.

Install the panel (13) on the top of the columns, tighten two nuts.

Place the coil on the base of the stepper motor assembly and secure with screws. Install the motor rotor on the axle.

Engage the rotor tribe with the first idler wheel. Install the stepper motor and secure it with two screws.

Place the electronic unit in the corresponding slots on the motor and secure it with two screws. Insert two terminals into the grooves of the panel, check the contact. If necessary, the tabs of the terminals can be folded.

To test the operation of the mechanism, connect it to a power source.

Electronic watches are subdivided into two main designs. The first one is actually a mechanical watch with a spring motor and an electric winding; the second is an electronic clock, the source of energy for which is an electric battery or accumulator.

There is no motor in such a watch, and the energy from the power source is used to directly actuate the governor.

Electrically wound watches have been around for decades; purely electronic watches, especially wrist watches, have appeared in recent decades.All of them are more high-precision than mechanical modifications and can operate continuously without changing the power source for a year or more.

Electromagnetic or magnetoelectric clock

According to the principle of operation, electronic clocks can be divided into contact, non-contact (transistor), synchronous, tuning fork, etc.

In a contact watch, the electric power supply circuit of the governor drive is closed by means of a contact. In contactless watches, a miniature transistor is used for the same purpose. The synchronous clock is driven by a synchronous electric motor. A tuning fork watch has a tiny tuning fork as a regulator, the vibrations of which set their mechanism in motion.

Currently, there are several dozen different types of contact clocks and almost the same number of transistor ones. There is no definite systematization of their designs.

Here are some of the more interesting options.

Electro-mechanical contact wrist watch

The principle of operation of this watch is based on the interaction of a permanent magnet and an electric coil. The impulse that drives the travel regulator in this watch is triggered by an electrical contact.

If in a mechanical watch, the movement of the hands is carried out due to the energy supplied from the mainspring through the engine, and the oscillatory system of balance - the spiral also consumes the energy of the spring to maintain the oscillatory process, while performing the functions of only a stroke regulator, then in an electronic-mechanical watch the balance system - spiral - an electromagnet performs two functions simultaneously: a regulator and a motor. Energy from the balance through the wheel system is transferred directly to the arrows. Thus, the kinematic diagram of a contact electronic-mechanical watch differs markedly from the kinematic diagram of a conventional mechanical watch.

The layout of the mechanism of an electronic mechanical watch is also different from the usual one. In most cases, electronic mechanical watches use balances that are much larger in diameter than balances in mechanical watches of the same size. This is because more balance has more momentum. The use of such a balance in electronic-mechanical watches improves the stability of the watch and greatly facilitates its operation.

The watch mechanism is assembled in three levels. At the top level is the balance, in the middle is the magnetic system, wheel gear and battery, and at the bottom is the switch mechanism. The balance axis passes through all three levels, which is specially lengthened. To protect it from possible shock damage, special shock absorbers are used, similar to the shockproof devices in mechanical watches.

The watch has a battery (battery). With one of its poles, the battery touches the current-collecting bus. Through this bus, the current flows into a column isolated from the rest of the watch mechanism, which carries a contact plate. This plate is threaded through a wire loop attached to a second plate, also insulated from the rest of the mechanism.

The other pole of the battery is in contact with the mass of the entire mechanism. In this direction, the current from the battery flows through the spiral to the balance, and from there - to the coil fixed in the slot of the balance rim. The coil is connected at one end to the balance itself. Keep in mind that all the electronic circuitry of a small watch is very small.

The balance has a contact pin to which the other end of the coil is connected. And under the balance is a permanent magnet of high power made of a special platinum-cobalt alloy. The electrical steel magnetic core creates the required concentration of the magnetic field in the path of the coil and reduces the dissipation of the magnetic field.

A roller is installed on the balance axis, in which an ellipse is fixed.As soon as the balance starts to move and begins to oscillate, the ellipse alternately grabs the ratchet teeth and rotates it. When the ratchet disengages from the ellipse, it is held in place by a magnet, also made of a platinum-cobalt alloy. The teeth of the steel ratchet are alternately attracted to the magnet, thus the ratchet is locked.

When the balance moves in the direction of travel, the ellipse grabs the next ratchet tooth and rotates it, as a result of which the next ratchet tooth is in a magnetic field. The magnetically tightened ratchet locks into position.

With the reverse movement of the balance, the ellipse does not remove the fixed tooth from the field of the magnet, since it displaces it only slightly. The ratchet is again attracted by the magnet and returns to its original position.

The ratchet wheel, in turn, meshes with the second center wheel. This wheel, when rotating, is mated with the minute wheel. A minute tribe is installed on the hub of the minute wheel. Through the bill wheel and its tribe, it is connected to the hour wheel.

The kinematics of the watch is as follows: if you put a battery in it and swing the balance, then the contact pin comes into contact with the plate and the electrical circuit is closed. The current flows through the coil, which will create an electromagnetic field around it. The moment the coil is close to the permanent magnet, the contact is triggered.

Due to the interaction of the electric fields of the coil and the magnet, a force will act on the coil to push the coil out of the magnetic field. The movement will cause the balance to rotate and begin to rotate. When the coil leaves the range of the magnet, the contact will be open and the impulse will cease to flow to the balance.

Under the influence of the spiral, the balance changes its direction of rotation. Because of this, the coil approaches the permanent magnet again. But no contact occurs as the contact pin goes past the end of the plate without touching it.

Some additional devices are required in a wrist electronic watch. The fact is that when you start the watch, you need to give the balance an initial impulse. A device in the form of a special system of levers is intended for this. At the same time, this device is intended to protect the balance from breakage when moving the arrows.

The system of levers slows down the balance when the turnover mechanism is activated.

Electronic-mechanical non-contact watches

This watch is also equipped with an electromagnetic balance drive, that is, a drive of the type in which an impulse is imparted to the balance due to the interaction of the fields of a permanent magnet and an electric coil (Fig. 7).

Rice. 7. Schematic diagram of the operation of an electronic-mechanical watch:

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This watch has a smooth running quartz movement (there is an abbreviation MPH 🙂), i.e. the second hand does not click loudly every second, but rather quietly rustles continuously. From the included salt battery, the clock quite accurately departed for 2 months. Well, I replaced it with an alkaline one and the clock got up in a month. Replaced again, again passed about a month. After the 3rd battery change, it became clear that something was wrong. Having checked the "dead" batteries, I realized that they are still alive. After consulting the nearest blogosphere, I found out that such mechanisms are not repaired and are easier to throw out. I scored until one day in Ikea I saw their cheapest model of watch and took it in my hands to see what kind of mechanism was there.
Here they are - the simplest plastic case and plastic glass, paper dial

Suddenly, the very same mechanism was installed in them, and on the sticker there was a mysterious inscription “Made in Belarus” = D

The price of the unit turned out to be something in the region of 250 rubles, I grabbed them gladly and rushed home to dissect. Swapped mechanisms. It is not difficult - the arrows are carefully removed from the stem, after which it is necessary to squeeze the latches a little and remove the mechanism from the case, assemble in the reverse order. The Ikeevsky version is disassembled in general in 1 minute, there is not even a single bolt there.

So, I assembled, put used batteries in both copies. Surprisingly, both went. I thought that when removing the arrows, he could fix something inside the old mechanism. But after about a month of working on a second-hand battery, the electricity zhor was drawn again.

The “repaired” Belarusian watch was running normally, the battery was not consumed earlier than it should have been. But I wouldn’t be me, if that’s where it all ended happily. Suddenly the watch refused to function in its natural upright position. Only horizontally! In this case, the mechanism revolves, but something has moved away somewhere. I both shook and knocked them, no, they do not go. Then I decided on an autopsy.

The autopsy was unsuccessful. The gears all got enough sleep and I spent the next half hour installing them back. At the same time, I did not notice any defects by eye. The engine was running, everything was turning. And in the assembled state, the watch still did not go.

Then for the 3rd time I went to the store for a watch and bought it. I unpacked it at home, there was another mechanism inside! I'm depressed. On the other hand, maybe there really were a lot of defects according to the previous model. Reassembled, hung up, everything works. The move is accurate.

And only then I suddenly googled. hand.zhpg

Much has come to light. To begin with, all mechanisms are universal, i.e. have the same size, but differ in the length of the stem on which the arrows are installed. This was done to allow the use of dials of different thicknesses, and it can also be provided for fastening to the dial with a nut for the stem. I even recognized one of the most common models of Chinese movements - this is JL 6262. Chinese shops during the crisis sell it for about 300 rubles apiece, that is. in pre-crisis times, the price was quite affordable. Here, I did not find anything except wholesale in boxes. One article advertised the GrandTime sweep mechanism in comparison with this JL 6262. For it, the scrap rate is stated as ≤0.05%, while for JL it is ≥4%, and the accuracy is 1-2 seconds per day. I wonder what percentage of the marriage I got.For working mechanisms, the operating time from an alkaline battery should be approximately 8-11 months and the service life of the mechanism should be approximately 6 years. Somehow not very much. I think many people still have Soviet clocks with discrete movements at home, which have been clinking for 30 years.

Thinking about the use of carcasses from Ikeev watches, I, without any special illusions, ordered a mechanism from the Chinese for a trial that cost less than $ 1 (this is already with delivery), but with a longer stem under the nut (you can hit a hand-made one). And not so long ago, this mechanism reached me.

The quality of the plastic is normal. For such a price, I generally expected some kind of horror. Suggest to use alkaline batteries

Stem thread

Plugged a truly Chinese mechanism into the IKEE watch

The first surprise - the mechanism was powered by an old battery, which I was about to throw away. But here is a slightly longer stem not completely retracted under the glass. When lightly pressed on the glass from the outside, the second hand stalled. I got out of the position not completely inserting the glass into the latches. And so it keeps pretty strong. So if you are going to change the mechanism, check if the length is enough for you.
The second surprise - the accuracy of this movement turned out to be higher than that of my Casio wristwatches!

Each of us sooner or later received a faulty, defective or poorly functioning product. I'm not an exception. In the fall, a non-working wristwatch was sent. (It was not possible to give a link to the product, so I advise you to look in the store for this watch by price.)

I had to read on the forums that it is useless to repair a Chinese watch. I will not say that I am a great optimist, but nevertheless I decided not to give up ...

Here is a screenshot from the monitor screen. These are "tickets", that is, questions to the customer service of the Tmart store (click to enlarge).

The picture is not very good, but you can see that there are five questions in total. One of them has been resolved. There was a sale, but for some reason these goods were not in the store. In general, they offer non-existent goods. After a while, the store itself offered to return the money and returned it. The issue was resolved.
However, there is no answer for any of the defective goods, and there are as many as four of them, look at the photo. It is written: "Awaiting response from customer service representatives." So, the wait for the first defective product lasts from December 3. Today is December 23rd. They don't even send replies. At the same time, I was assigned the T1 status, according to which priority service is required, including customer service responses.

P.S. I wrote to support (it's good that I talked with him about the refund, now I know the address - the site simply does not have an address to write to, only tickets). Only today (12/23/2013) I received an answer in English. The meaning is this: sorry for the wait. how can I help. Unsubscribe, but still at least some kind of response.
Hooray! Tmart's support is more alive than dead!

Now is the time to start repairing the watch. I must say right away that I am not a watchmaker. Now a few words about repairs in general. If the car is poorly repaired, the brakes may fail, for example, or the wheel will fly off at high speed, which is very dangerous. An illiterate watch repair does not lead to fatal consequences. Therefore, we have nothing to fear.
I'm just going to buy a special tool for opening the cases, so for now I'm opening it with a knife. Here the cover is a clapper, that is, without a thread.
The mechanism is very simple. Made of plastic. More expensive watches are made of metal. The mechanism says "Singapore", there are also letters and numbers.

Since a white plastic container is installed around the mechanism, I pry it open with a knife and take it out of the metal case. Attention! The mechanism cannot be placed on the table with a dial - the hands will be damaged. By the way, when the head is disconnected, the arrows can turn independently under the influence of gravity - this is not a malfunction.

Now I gently blow off the dust (in an amicable way, I need a syringe, which must be washed inside). I wipe the dial with a paper napkin carefully so as not to damage the hands.There is an opportunity to see what is written on the dial. It turns out that the mechanism here is Japanese (remember, the mechanism itself says "Singapore"). The caliber of the movement is also indicated. Most likely, the numbers are taken from the ceiling.

Currently, the refurbished watch is waiting to be presented. In conclusion, by tradition, a photo with animals. They are also waiting ... They are waiting for the clock to strike twelve. All a Happy New Year!

In this small essay with photographs, I will show the general public how to treat a rather common "sore" digital electronic clock - an imprecise move. The watch can lag behind or rush, and most often we do not pay attention to small errors in the course, but when the watch is 5 (five) minutes behind a day, it starts to get annoying.
Ready? Go!

Intro

I bought this watch in order to feel nostalgic for the old Soviet times, when the sun was greener and the grass brighter ... or vice versa. never mind! The main thing is that the joy did not work out - the clock lagged vilely. More than 5 minutes a day. It is necessary to treat, I thought.

Looking ahead, I will note that I did not open a dispute, a hundred rubles is not that money. The problem is not with the seller who sent the defective item. The problem is in the product, which the seller cannot check in any way - won't a Chinese / Chinese woman sit and detect the accuracy of the move?

To heal the watch, we need:

Necessarily
+ soldering iron. preferably not very powerful, 25-40 watts is enough. 60 will already be a bit too much.
+ quartz resonator for replacement. sold either in china or in any radio store. is inexpensive, called "watch quartz".
+ thin Phillips screwdriver or thin flat screwdriver. cross is preferred.

Desirable
+ tweezers with sharp jaws - take away the screws (dada, the body is plastic, the frame is also plastic, screws are everywhere)
+ good lighting and a stationary magnifying glass or jeweler / watchmaker glasses to see well Little Red Riding Hood clock.

Unscrew the four screws holding the back cover. Carefully remove the cover, remove the piezoelectric resonator (squeaker). We do not paw the squeaker with our fingers; we hold it by the side edges and by the metal base.

Note that the watch does not have a protective pad, therefore water and sweat will get inside the watch. We understand that the Chinese, for the sake of cheapness, save on everything in general, which means that the glass most likely sits on double-sided tape and buttons without rubber seals. This means that the watch will have to be removed in bad weather and during physical work.

We take out the watch from the case.

We put the case, back cover, back cover screws and squeaker aside.

We unscrew four screws - three hold the 2016 lithium battery, one holds the spring foot to send a signal to the buzzer.

Let's put it all aside. We consider the fee. More screws are not visible, which means it's good.

Carefully remove the board from the plastic holder with tweezers.

Inside the holder, we see a conductive rubber band that transmits a signal to the LCD and the LCD itself itself.
We don’t touch the elastic band with our fingers, because it’s not fig. A speck or dirt will fall, some segment on the indicator will fall off and disassemble again ... nafig need ...
The blue heat shrink is the coil that gives the sound. You don't need to touch it either. damage is as easy as shelling pears, the wires there are thinner than a hair.
But the metal cylinder on the legs is our quartz resonator, which needs to be changed.

To replace the quartz, I decided to use donor quartz from an old motherboard, which died ten years ago and I am slowly pulling it apart into a small kit.

Quartz here is somewhat larger than in a watch.
Here, for comparison, the already soldered quartz from the motherboard and the clock board.

We apply quartz to the board. Fits. we put quartz in a clip, it is also suitable! Fine! Change!

To replace, we simply solder one quartz and solder another.
There is no polarity, no peculiarities.The procedure is simple and does not require any special qualifications.

Voila! quartz replaced. We align the quartz case so that it is just below the board and does not touch the battery.

We assemble the mechanism in the reverse order - we put the board on the clip, there are guide pins. We put a battery on the board, minus down.

We put the contact block on top of the battery. In this watch, he simultaneously holds the battery and is a contact group for the buttons. We fasten it with three screws. Then a separate contact to the buzzer. We fasten it too.

We turn the block over and look - the clock should start. If this does not happen, then either the battery is turned upside down or the quartz is not soldered or it is inoperative or has killed the board by static 🙂
Well, if everything worked, carefully put the board in the watch case, center it so that the numbers are parallel to the edge, then put the squeaker back on, screw on the lid ...

OK it's all over Now!
We defeated a big problem)))

During the day, the clock did not go forward or backward, it goes exactly and precisely. I'll watch it again and then unsubscribe about the accuracy.

I must say that the procedure for replacing quartz is the same for all quartz watches - digital, analogue. But, we must remember that most of the Chinese quartz watches are assembled on plastic rivets, which are melted by "mushrooms", i.e. in fact, having disassembled the watch, it is very difficult to assemble it.
Well, the size of the quartz also matters - if the quartz from the motherboard did not fit in size, then you would have to look for another, smaller size.

Outside of this "murzilka" was a film that the Chinese did not remove from the LCD when they put it in the clip. I removed this film and the contrast of the screen increased slightly. The film is almost invisible, but it was on my watch.

UPD.
Over the past four days, since the replacement of quartz, the watch has run forward by two seconds. 15 seconds a month.
For a penny watch and free quartz, I think the result is satisfactory. Personally, he quite satisfies me)))
You can, of course, look for quartz watches for a penny at flea markets, kick a bunch of quartz from there and experiment with accuracy ... but we will leave this to perfectionists and stoned freaks)))

In the comments, a recipe for fine tuning of accuracy is given by soldering miniature ceramic capacitors. As an alternative to replacing quartz, it is quite viable and healthy. The main thing is that there is a place where these capacitors are placed. Well, the presence of these ...

And in general, friends, the main thing is not an overview, the main thing is comments)))
Thanks everyone for valuable ideas and various discussions)))