Coffee is a useful and tasty drink that can give a feeling of cheerfulness. Some people do not even imagine the beginning of the day without it. Although there are many sorts of instant coffee on the shelves, they are not really satisfied with real connoisseurs of this drink. So, as the main invigorating substance is caffeine, it practically does not remain after processing and extraction. Therefore, in order to get a drink with higher-quality components, it is necessary to have a coffee machine that is not quite accessible, or grind fried grains in a coffee grinder the subsequent preparation of them in the Turk on the stove. This option is not new and does not require large cash costs. Many left Soviet coffee grinders, and imported, more practical devices for everyday use appeared in home appliances stores. In modern coffee grinders, almost nothing has changed compared to their domestic counterparts. The principle of operation has remained the same, the only thing that has been added is electronic control. If we speak about the quality of products, it does not really shine,therefore, the device periodically needs repairs of varying complexity. Here, in the photo, there is a coffee grinder with a problem in operation, that is, it does not react either to inclusion in the network or pressing the control buttons.
Repair of a coffee grinder
No short circuits, no smoke and no smoke from it. It just stopped working.

Let's start disassembling.

We put the device on its side and clasping the slider of the regulator, remove it.
Repair grinders
Next, using a thin screwdriver, remove the bottom from the latches. It rests on the four latches and slots in the case.
Repair of the coffee grinder
In this coffee grinder there is a reel with a rotary knob through which, for convenience, the wire "hides" inside the case. In this regard, the power cable has rotating contacts on the bottom.
Repair grinders
These contacts are in the form of a block, removed together with the cable.
Repair of the coffee grinder
Then, unscrew the four screws securing the additional base. Removing it, you can see the engine itself,electronic circuit and other parts necessary for diagnostics.
Repair of the grinder
At once I would like to note the extreme inconvenience of inspection and diagnosis as a whole, since the wires are very short and thin, and everything is also compact and compact.
Repair grinders
Mainly interfere with the wires going to the board and one wire from the engine.
Repair of the grinder
To continue, you need to disconnect the wires from the board and it can be done without a soldering iron, since the connection is made on the connectors. But removing these connections with your fingers is not so easy , a screwdriver with a straight tip will help.
Repair grinders
Repair grinders
Do this with other connections.
Repair grinders
It would be nice to sketch or take a picture before removing the color of the wires, where what is, so that during the subsequent connection not to be confused. When,the wires will be removed, the electronic board can be pulled out of the case and free access to the engine.
Repair grinders
Repair grinder
The motor can not be pulled out while the knife is fixed on its axis. It is wound counter-clockwise, as the carving is left. Therefore, the knife should be unscrewed clockwise, and in order to fix the motor axis, we insert a screwdriver into a special slot, as shown in the photo.
Repair grinders
Repair grinders
Once the knife is removed, the engine will easily come out of the body.
Repair grinders
Repair grinders
Repair grinders
Now remove additional parts from the rotor, remembering the installation sequence.
Repair grinders
Repair grinders
Repair grinders
Try to roll the rotor of the motor with your fingers.If the rotation is tight, then you need to disassemble the engine, wipe and lubricate the friction parts.
Repair grinder
In our case, the rotor rotates freely, but additional lubrication does not interfere. You can do this without disassembling the motor.
Repair grinders
Take the grease on the tip of the screwdriver, and apply it on the axis, next to the bearing. Next, move the axis of the rotor from top to bottom. Thus, part of the lubricant will fall inside the sleeve. This will give a better slip, which does not hurt, the more it is possible to do it. After that, check the length of the collector brushes. If they are short and practically fall out of the inserts, then they should be replaced. Next, proceed to checking the integrity of the cord and power supply connector.

Repair of the grinder

To do this, disconnect it from the sole and we plug the plug into the network. Using the voltage indicator or AC voltmeter, measure the voltage at the contacts. How to do this can be seen in the photo.
Repair grinders
Repair grinder
The pointer shows 220 volts, so the cord and the connector are fine. Now, we check the operation of the protection switch against accidental activation.While the grinder is operating, its closed lid presses on the glass rod, which in turn presses the switch and closes its contacts. Therefore, connect the ends of the device to the terminals of the switch and click on its button.
Repair grinders
During normal operation, the device will show a short circuit. If it does not exist, then the matter is in it, that is, a replacement cannot be avoided. Now we turn to checking the engine. We insert the board into special grooves, and the engine is placed side by side.
Repair grinder
Also, insert the power connector with the cord in its place (in the bottom of the case) and turn on the power plug in the network. It is also necessary that the switch contacts at the time of check were closed , you can do this by inserting the plastic rod, as in the photo.
Repair grinder
You can of course hold the button and finger at the time of starting, but it's not entirely safe in the event of a short circuit of the motor winding. To now check if the voltage on the motor and the board , one end of the pointer is connected to the common wire,and another with switch output.
Repair grinder
A pointer should show the presence of voltage, as in the photo. If there is no voltage, then the problem should be looked for in the power supply connector of the sole. Disconnect the power supply plug from the mains. When we checked the presence of voltage, and it is, we connect the connectors to the corresponding contacts on the board. Repair grinder
The one that comes from the engine and the board (common), connect the piece of copper wire, from the connector to the corresponding contact. This must be done so that the engine can be checked in the supine position, as it is more convenient and safer.
Repair grinder
When the chain is assembled, we plug the power plug into the mains, and gently holding the engine, press the selection button of the grinding degree (one of three). One of the LEDs on the control board should be lit. Next, press the start button. The engine does not rotate, but when one of the connectors on the board wiggled, the rotation periodically appeared and disappeared. It was exactly the connector where we connected the engine to the board using a wire. A subsequent test of the circuit of this section showedthat at the place where the plug was soldered, microcracks formed on the board and there was no good contact, respectively. The device did not show the circuit, from the plug to the place of its soldering on the board.
Repair of the grinder
The problem was solved by soldering this place, it is also advisable to solder two other plugs using flux and tin.
Repair grinder
Very good results are obtained by flux, made from 30% of ground rosin and 70% of alcohol. It cleans the place of soldering well, and with its help the connection turns out to be reliable enough. Repair grinderRepair grinderRepair grinders When assembling, disconnect all the wires from the engine, find and install in its place a rubber gasket. It should be installed exactly in the specified place.
Repair grinder
Repair of the grinder Next, we put the washers on the motor axis and the brass bushing.
Repair grinders
Repair grinders
Now,We are trying to insert the engine into the body of the grinder without breaking the wires, and so that its axis goes into the hole of the working bowl.
Repair grinders
Repair of the grinder
When this happened, holding the engine with the right hand, we screw the working knife counterclockwise.
Repair of the grinder
Now the engine rests on its axis from above, and below it should be fixed with a sole with a rubber gasket. Before putting on the bottom, you need to connect all three connectors on the board . Make it awkward, but possible. Also, we insert into the corresponding openings of the case, the “START / STOP” button and glass caps of the operating mode indicator. After that, having aligned the engine housing approximately under the gasket seat, we put on the pan.
Repair of the grinder
The axis of the grinding time adjustment resistor should be located approximately in the center of the hole in the machine body.
Repair grinders
Next,fix the lower part of the grinder case with a plastic sole.
Repair of a grinder
We put on the river of a regulator, and having included a coffee grinder in a network, we check work of electronics. To do this, we put a lid on or press the protective switch stem with a finger, and try to choose an operation mode.
Repair grinders
Repair grinders
Repair grinders
Different modes of operation should be highlighted by the corresponding LEDs. After selecting the mode, press the “START” button.
Repair of the grinder
The grinder should work for a certain time and turn itself off. The operating time depends on the degree of grinding. The larger it is, the less time it takes. At this the repair is over and now you can enjoy the taste of your favorite drink again.
Date: 08.10.2018, 10:09 / Views: 94562

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