Piranha 12 cc plus DIY repair

In detail: piranha 12 cc plus DIY repair from a real master for the site my.housecope.com.

Our company is engaged in the repair of shredders ProfiOffice Piranha 12 CC +.
Repair of shredders and paper shredders is one of the main activities of our company.

Our specialists have vast experience in the repair of both office and professional shredders. The smooth operation of all equipment in the office is very important for our clients. Every engineer in our company is an expert in the maintenance and repair of shredders.

A paper shredder or shredder is a very important piece of equipment in an office. It's no secret that in modern business such words as industrial espionage and leakage of confidential information can be found in almost any organization engaged in commercial activity. For this reason, the smooth operation of essential equipment such as a shredder is extremely important.

The trouble-free operation of the equipment directly depends on the organization of the service department. We carry out work on the repair of shredders and paper shredders, both on a one-time basis and within the framework of a maintenance agreement. When you enter into a maintenance contract for your shredder, you will forget about interruptions in work due to equipment malfunction. Before performing any work, we will carry out diagnostics and agree with you on the final cost of the repair.

We give a guarantee for all replaced parts and blocks.

If you decide to purchase a new device due to the high cost of repairs, or the impossibility of such, we will definitely help you with the optimal choice according to the parameters you need.

Video (click to play).

We give a 3-month warranty for the repair of the shredder (paper shredder). Repair of the shredder under warranty is performed out of turn. The equipment is repaired both in a stationary workshop and in the client's office. Significant discounts are provided to regular customers.

We produce repair of shredders ProfiOffice Piranha 12 CC Plus... One of the main activities of our company is repair of paper shredders.

A shredder is a device that destroys paper and other media. Shredders differ into groups by type and class: personal or office. There are also differences in the degree of secrecy.

Any repairs to shredders should be carried out by an experienced and suitably qualified technician. We have accumulated vast experience for the professional repair of all types of shredders.

The quality and reliability of the equipment is important for our customers. All our employees are certified by the most renowned shredder manufacturers.

The most common problems associated with repairing shredders are broken gears and broken drive belts. Our service department is a guarantee of uninterrupted operation of the equipment. Before performing any work, we will carry out diagnostics and agree with you on the final cost of the repair.

Our company carries out work on the repair of shredders (paper shredders), both on one-time requests and within the framework of a maintenance contract, in this case we carry out all the necessary work during regular maintenance. You can make payment both by bank transfer and in cash.

All replaced parts and blocks are manufactured at the factory. We give a guarantee for each replaced or repaired part.

Free diagnostics of a faulty shredder, one of the services of which you can use with us. Warranty repairs are free of charge and out of turn.

When ordering repair work in our company, you will feel the quality of the services we provide, and you will also be satisfied with the opportunity to save money and at the same time receive warranty support for all types of services.

If you decide to purchase a new shredder or paper shredder due to the high cost of repairs, or the impossibility of such, we will definitely help you with the best choice according to the characteristics you need.

We will always come to your aid and will repair a faulty shredder or paper shredder as soon as possible.

For the repair of office equipment ProfiOffice our clients use the service “Call of the master”. To call the repairman of office equipment, use one of the following methods:

By phone: +7 (495) 785-6583
Fill out the online application - describe briefly the malfunction of office equipment
Request a call back and we will call you back

The Mosservice service center specializes in the repair of Piranha 12 CC Plus shredders in Moscow. Our engineers will carry out preventive maintenance, cleaning, repair, maintenance of ProfiOffice office equipment in a short time. If your ProfiOffice Piranha 12 CC Plus shredder breaks down, we can repair the equipment in our repair shop or on your territory at the location of the shredder.

We value decent, honest, loyal partners and are committed to long-term mutually beneficial cooperation related to the maintenance and repair of shredders manufactured by ProfiOffice. For regular customers of Mosservice, who work with us under a service agreement, there are special prices for servicing office equipment. We work with maximum efficiency at the established affordable prices for our work. We have created the most convenient conditions for long-term cooperation with Mosservice.

All installed parts for the ProfiOffice Piranha 12 CC Plus shredder are guaranteed during maintenance. We have only branded parts from ProfiOffice in our warehouse.

office, 4th level of secrecy, continuous operation, basket: 32 l

The specialists of the "K-SERVICE" company have accumulated rich experience in the repair of paper shredders (shredders) of any complexity.
PROFIOFFICE We are specialized in the repair of the PROFIOFFICE PIRANHA 5CC shredder
We will be happy to provide you with services for restoring the performance of your device, both on your territory and in the workshop of our office.

Our company is ready to repair your device in a short time and at affordable prices!
The repair includes free prophylaxis and proceeds as follows:

diagnostics of the device is carried out, during which a malfunction is detected and the spare parts required to eliminate it,

after the diagnostics, the expediency of carrying out the repair is discussed with the client and, if agreed, the repair is carried out,

after the repair, the quality of the device is checked,

if the client is satisfied with everything, then he makes payment for the repair in a convenient way for him, and from our side we issue a written guarantee for 3 months.

During the diagnostics process, other potential malfunctions may also be revealed that must be eliminated in order to ensure the further correct operation of your PROFIOFFICE PIRANHA 5CC shredder. In the absence of the required spare parts from the master, the time of the repeated arrival of the master with the necessary spare parts during the working day is discussed with the client. To minimize such situations, and thereby speed up the repair process, describe the symptoms of the malfunction in as much detail as possible!
In rare cases, when a malfunction cannot be eliminated on site, we provide free transportation services for the PROFIOFFICE PIRANHA 5CC shredder to our workshop and back in Moscow. The term for eliminating the malfunction is discussed with the client and does not exceed three working days.

Eliminating the malfunction of PROFIOFFICE shredders, the specialists of the K-SERVICE service center use branded spare parts, check the official service documentation and catalogs to ensure the smooth operation of the mechanisms and be sure to conduct control tests of the quality of your shredder. Our service engineers have the necessary experience, tools and spare parts to diagnose faults and repair shredders of any complexity.

Our company is ready to prevent damage to your PROFIOFFICE PIRANHA 5CC shredder by carrying out periodic maintenance (preventive maintenance)

Prevention consists in partial disassembly of the shredder, determination of its technical condition, cleaning, rinsing and lubrication of moving parts, assembly of the shredder and the final check of the quality of the apparatus functioning. In the event of a malfunction, negotiations are held with the client for further repair of the PROFIOFFICE PIRANHA 5CC shredder.
Preventive maintenance not only extends the life of the shredder, but also provides a safe and comfortable working environment for users who work in your office every day.

Our company is ready to conclude an agreement with you for the prevention and repair of all PROFIOFFICE shredders of your organization

In addition, you can conclude with us contract for periodic maintenance and repair of all shredders of your company. This will allow you not to waste your time looking for specialists to maintain your fleet of devices and think about the timing of prevention. We will call you back and agree on the time of arrival of our specialist to carry out the prevention of a particular device. In the event of unforeseen malfunctions, our specialist will come and fix the problem as soon as possible, regardless of the workload of our company's masters.

Our company provides you with a written guarantee for 3 months

Of course, we provide a three-month warranty for all work performed by us. If during this time the device breaks down again, our engineers will quickly and free of charge fix it.

Our prices for service and repair of the PROFIOFFICE PIRANHA 5CC shredder:

Diagnostics of the PROFIOFFICE PIRANHA 5CC shredder: 600 rub. Under the contract: 540 rub.
Prevention of shredder PROFIOFFICE PIRANHA 5CC: 700 rub. Under the contract: 630 rub.
Repair of the control board of the PROFIOFFICE PIRANHA 5CC shredder: from 1300r. By agreement: from 1170 rubles.
Replacement of gears, belt, knives of the PROFIOFFICE PIRANHA 5CC shredder: from 900 rub. By agreement: from 810 rubles.

Check out the repair and cost for specific brands:

PROFIOFFICE models that we repair:

This model is discontinued.
However, you can choose a more perfect one: analogue
Or leave a request, and we will call you and help you choose an analogue.

Maximum simultaneous loading of 12 sheets (A4)
Speed 66 mm / second
Fragment size 3 × 10 mm
Basket capacity 32 l (320 sheets)
Security level 4
Paper bin width 270 mm
Shreds paper
Weight 21.5 kg

This model, due to its parameters, power and basket volume, is perfect for use in any office. Automatic start / stop with electronic sensor. Automatic interruption of the shredding process when the basket / paper bin is not inserted correctly. Prevent paper blockage with automatic reverse function and light signal.

FREE DELIVERY BY MOCKBE.

Gear for a shredder (document shredder) РrofiOffice Рirаnha 5 СC Рlus (13 + 38 teeth). The shredder is first from the engine. Interchangeable with gear for the OfficeKit S200 shredder
Repair by the departure of the master within the Moscow Ring Road to you 1000 rubles.
Free delivery in the aisles of the Moscow Ring Road.
Sending to the regions of Russia.
Call from 09 to 23 seven days a week.

REF. 00114
REF. 00114

FREE DELIVERY BY MOCKBE.

Repair of welding inverters, despite its complexity, in most cases can be done independently.And if you are well versed in the design of such devices and have an idea of what is more likely to fail in them, you can successfully optimize the costs of professional service.

Replacement of radio components in the process of repairing a welding inverter

The main purpose of any inverter is to generate a constant welding current, which is obtained by rectifying a high-frequency alternating current. The use of a high-frequency alternating current, converted by means of a special inverter module from a rectified mains supply, is due to the fact that the strength of such a current can be effectively increased to the required value using a compact transformer. It is this principle underlying the operation of the inverter that allows such equipment to have compact dimensions with high efficiency.

Functional diagram of the welding inverter

The welding inverter circuit, which determines its technical characteristics, includes the following main elements:

a primary rectifier unit, the basis of which is a diode bridge (the task of such a unit is to rectify an alternating current coming from a standard electrical network);
an inverter unit, the main element of which is a transistor assembly (it is with the help of this unit that the direct current supplied to its input is converted into an alternating current, the frequency of which is 50–100 kHz);
a high-frequency step-down transformer, on which, due to a decrease in the input voltage, the output current is significantly increased (due to the principle of high-frequency transformation, a current can be generated at the output of such a device, the strength of which reaches 200–250 A);
output rectifier, assembled on the basis of power diodes (the task of this block of the inverter includes rectifying an alternating high-frequency current, which is necessary for performing welding).

The welding inverter circuit contains a number of other elements that improve its operation and functionality, but the main ones are the above.

Repair of an inverter-type welding machine has a number of features, which is explained by the complexity of the design of such a device. Any inverter, unlike other types of welding machines, is electronic, which requires the specialists involved in its maintenance and repair to have at least basic radio engineering knowledge, as well as skills in handling various measuring instruments - a voltmeter, digital multimeter, oscilloscope, etc. ...

In the process of maintenance and repair, the elements that make up the welding inverter circuit are checked. This includes transistors, diodes, resistors, zener diodes, transformer and choke devices. The peculiarity of the design of the inverter is that very often during its repair it is impossible or very difficult to determine the failure of which particular element was the cause of the malfunction.

A sign of a burnt out resistor may be a small carbon deposit on the board, which is difficult to distinguish with an inexperienced eye.

In such situations, all the details are checked sequentially. To successfully solve such a problem, it is necessary not only to be able to use measuring instruments, but also to be quite familiar with electronic circuits. If you do not have such skills and knowledge at least at the initial level, then repairing a welding inverter with your own hands can lead to even more serious damage.

Realistically assessing their strengths, knowledge and experience and deciding to undertake independent repair of inverter-type equipment, it is important not only to watch a training video on this topic, but also to carefully study the instructions, in which manufacturers list the most typical malfunctions of welding inverters, as well as ways to eliminate them.

Situations that can cause the inverter to fail or lead to malfunctions can be divided into two main types:

associated with the wrong choice of welding mode;

caused by the failure of parts of the device or their incorrect operation.

The technique for detecting an inverter malfunction for subsequent repair is reduced to the sequential execution of technological operations, from the simplest to the most complex. The modes in which such checks are performed and what their essence is, is usually specified in the equipment instructions.Common inverter malfunctions, their causes and remediesIf the recommended actions did not lead to the desired results and the operation of the device has not been restored, most often this means that the cause of the malfunction should be looked for in the electronic circuit. The reasons for the failure of its blocks and individual elements may be different. Let's list the most common ones.

Moisture has penetrated into the interior of the device, which can happen if precipitation falls on the body of the device.

Dust has accumulated on the elements of the electronic circuit, which leads to a violation of their full cooling. The maximum amount of dust gets into inverters when they are used in highly dusty rooms or on construction sites. In order not to bring the equipment to such a state, its interior must be regularly cleaned.

Overheating of the elements of the electronic circuit of the inverter and, as a consequence, their failure can lead to non-observance of the duration of the switch (DC). This parameter, which must be strictly observed, is indicated in the technical passport of the equipment.

Liquid traces inside the inverter housingThe most common problems encountered when operating inverters are as follows.Unstable arc burning or active metal spatter This situation may indicate that the wrong amperage has been selected for welding. As you know, this parameter is selected depending on the type and diameter of the electrode, as well as on the speed of welding. If the packaging of the electrodes that you are using does not contain recommendations on the optimal value of the current strength, you can calculate it using a simple formula: 1 mm of the electrode diameter should account for 20–40 A of welding current. It should also be borne in mind that the lower the welding speed, the lower the current must be.Dependence of the diameter of the electrodes on the strength of the welding currentThis problem can be associated with a number of reasons, and most of them are based on undervoltage. Modern models of inverter devices also operate at reduced voltage, but when its value drops below the minimum value for which the equipment is designed, the electrode begins to stick. A drop in the voltage value at the output of the equipment can occur if the device blocks do not contact the panel sockets poorly.This reason can be eliminated very simply: by cleaning the contact sockets and fixing the electronic boards in them more tightly. If the wire through which the inverter is connected to the mains has a cross-section of less than 2.5 mm2, this can also lead to a voltage drop at the input of the device. This is guaranteed to happen even if such a wire is too long.If the length of the supply wire exceeds 40 meters, it is practically impossible to use an inverter for welding, which will be connected with its help. The voltage in the supply circuit can also drop if its contacts are burnt or oxidized. A frequent cause of electrode sticking is insufficiently high-quality preparation of the surfaces of the parts to be welded, which must be thoroughly cleaned not only from the existing contaminants, but also from the oxide film.

Read also: DIY loft repair

Selection of the cross-section of the welding cableThis situation often occurs in the event of overheating of the inverter device. At the same time, the control indicator on the panel of the device should light up. If the glow of the latter is hardly noticeable, and the inverter does not have a sound alert function, then the welder may simply not be aware of overheating. This state of the welding inverter is also typical when the welding wires are broken or spontaneously disconnected.Spontaneous shutdown of the inverter during welding Most often, this situation occurs when the supply of the supply voltage is turned off by circuit breakers whose operating parameters are incorrectly selected. When working with an inverter device, automatic machines designed for a current of at least 25 A must be installed in the electrical panel.

To read the instructions, select the file in the list that you want to download, click on the “Download” button and you will be redirected to the page where you will need to enter the code from the picture. If the answer is correct, a button will appear in place of the picture to receive the file.

If there is a “View” button in the field with the file, it means that you can view the instruction online without having to download it to your computer.

If your material is not complete or you need additional information on this device, for example, a driver, additional files such as firmware or firmware, then you can ask a question to the moderators and members of our community, who will try to promptly respond to your question.

You can also view the instructions on your Android device.

It would seem, why does a chainsaw need a summer resident who grows vegetables and fruits, or the owner of a country house who has a small garden and several flower beds? The question disappears when there is a desire to build a bathhouse, update a greenhouse, topple an old business, or just make a bench for relaxation. Unfortunately, any mechanism periodically needs preventive maintenance and replacement of spare parts, and for this you need to be well versed in the device of the product, besides, repairing the chainsaw with your own hands will save time and money.

All chainsaws are similar in structure, regardless of whether they are European (ECHO, Stihl, Husqvarna) or domestic (Kedr, Ural). The main elements are located inside the body - the fuel tank and the engine, and outside the starter, the handle, the saw part (tire) with the chain. A sharp jerk in the cable starts the engine, which starts the saw blade.

To begin with, we suggest that you familiarize yourself with the video clips that show how the chainsaw works and how it works:

From time to time, the saw malfunctions, which require disassembly to eliminate. What can happen to such a simple mechanism as a chainsaw? At least the following:

Stops getting started;
Starts up, but soon stops;
Ceases to function in the cut;
Loses its power;

Most of the malfunctions are associated either with interruptions in the operation of the engine (fuel supply system, exhaust system, ignition, cylinder-piston part), or with malfunctions of other systems and assemblies (clutch, chain brake, tire, lubrication system). Consider the most common breakdowns and techniques for their elimination.

A serviceable chainsaw starts with one jerk and does not fail in the cut

The first thing to do if a chainsaw breaks down is to inspect the spark plug by disconnecting the wire and carefully unscrewing it with a special key.

The components of the chainsaw ignition system: 1 - flywheel with magnets, 2 - ignition module, 3 - spark plug, 4 - high voltage wire

Unscrew the spark plug to check its condition.

Her appearance says a lot:

Dry. Most likely, the fuel mixture does not enter the cylinder. It's not about the ignition system, so the plug is screwed back in.
Strongly splashed with fuel. The reason for the excess fuel mixture lies either in the violation of the starting rules, or in the incorrect adjustment of the carburetor. The spark plug is carefully wiped, shut off the fuel supply and turn on the starter - to remove excess fuel and ventilate the combustion chamber. Then the candle is put in place and the mechanism is started again.
Covered with black carbon. This may indicate the use of low-quality oil, an incorrectly adjusted carburetor, or an incorrectly calculated gasoline to oil ratio.The candle should be washed, cleaned of carbon deposits with a sharp object (awl or needle), wipe the electrodes with a sandpaper and put in place.

When checking the candle, you need to pay attention to the gap between the electrodes: it is considered normal from 0.5 to 0.65 mm. A damaged or worn gasket must be replaced.

A large amount of black carbon on the spark plug indicates a malfunction of the engine.

To be sure, you should also check for a spark. To do this, put the ignition cable on the spark plug, connect the plug nut and the cylinder with pliers, start the starter and watch for the spark. If it is missing, the plug must be replaced. If the new spark plug also does not emit sparks, the problem is in the high-voltage wire or in the broken connection with the spark plug.

Fuel may not enter the cylinder for the following reasons:

Dirty fuel filter. Remove the fuel hose and check how the fuel flows. If the jet is weak, the filter may need to be cleaned. It is taken out through the filler hole of the fuel tank and cleaned; in case of severe contamination, it is replaced with a new one. As a preventive measure, it is recommended to replace the fuel filter every three months.
Clogged breather (holes in the fuel tank cap). It is also checked by disconnecting the hose, in case of blockage, clean it with a needle.
Lack or insufficient amount of fuel. There may be several reasons for the malfunction. The first reason is a clogged air filter. Air ceases to flow into the carburetor in the required amount, in this regard, due to a too rich fuel mixture, engine operation is disrupted. The contaminated filter is carefully removed, cleaned and washed in water, then dried and reinstalled.

Another reason is improper adjustment of the carburetor. The adjustment is made with three screws.

Timely replacement of the fuel filter ensures full fuel supply

The fuel hose and choke actuator must fit snugly on the fittings

The throttle lever cable must be in place

During work, you must use the instructions, otherwise you can only make it worse.

And the last reason is a violation of the integrity of the membrane or clogging of the carburetor channels.

To repair the carburetor yourself, you need to get acquainted with all its parts.

All parts must be clean, dry and in good condition.

If the engine works fine at low speeds, and at high speeds it starts to stall, the reason may lie in the spark arrester of the muffler, clogged with combustion products.

remove the muffler;
disassemble (there are also non-separable models);
remove carbon deposits using detergents;
dry with a hairdryer;
install in place.

Dry cleaning is unacceptable, as the soot contains carcinogens, the inhalation of which is hazardous to health. After removing the muffler, cover the outlet with a clean cloth.

Interruptions in the operation of the chainsaw signal a possible clogging of the muffler

To avoid clogging of the muffler, it is necessary to monitor the composition of the fuel mixture. The amount of oil should not exceed the rates recommended by the manufacturer. Poor oil quality also negatively affects engine performance.

Often the engine will not start or run at full capacity due to low cylinder pressure. It can be caused by piston or cylinder wear, piston ring sinking, bearing wear. You can partially examine the state of the cylinder-piston group (CPG) by removing the muffler and looking into the opened hole.

A compressor placed in the plug hole will help to measure the compression in the engine - according to the measurement results, you can also talk about the state of the CPG. Accurate data is obtained only after complete disassembly of the mechanism. If the piston is chipped or scratched, it must be replaced. The piston ring must be clean, free of carbon deposits, and be exactly in place.

Piston and crank mechanism wear is considered a serious problem.

According to the results of measuring the compression, one can judge the condition of the parts of the CPG

Let's consider three main faults:

Oil leakage. Check that the pipes are tightly connected to the pump unions and that they are not cracked. Problem tubes are sealed with sealant or replaced.
Insufficient oil supply. Most likely, the lubrication passages are clogged.
Cracks in the oil pump housing. Part needs to be replaced.

Here's how to diagnose the lubrication system:

The chain brake often does not work due to clogging of grease or sawdust in the brake band and the space under the cover. All parts should be cleaned from blockages. Perhaps the tape is simply worn out, then it needs to be replaced.

The chain brake is restored by mechanical cleaning

Some parts of a chainsaw will wear out faster than others. These include the drive sprocket, bar, chain, anti-vibration elements. For quick replacement, it is best to always have spare parts on hand. Sharpening the chain should not be neglected.

Hello everyone. The other day, a welding inverter was brought to the repair, perhaps my note about this repair will be useful to someone.

This is not the first welding machine that had to be done, but if in one case the malfunction manifested itself like this: He switched on the inverter to the network ... and broads, knocked out the circuit breakers in the electrical panel. As the autopsy in the welder showed, the output transistors broke through, after the replacement everything worked.

But in this case, everything was somewhat different, according to the owner, the device at times stopped cooking, although the power-on indicator was on. These guys themselves opened the case - they tried to determine the malfunction and noticed that the inverter reacted to the bending of the board, i.e. when it was bent, it could work. But when the welding inverter came to me, it did not turn on at all, even the on indicator did not light up.

"Titan - BIS - 2300" - it is this model of the inverter that was repaired, the circuitry repeats the welding machine of the same power of "Resant" and, as I suppose, many other inverters. You can view and download the diagram here.

In this welding machine, a pulsed power supply is used to power low-voltage circuits, and it was just it that was faulty. The UPS is based on the UC 3842BN PWM controller. Analogues - domestic 1114EU7, Imported UC3842AN differs from BN only in lower current consumption, and КА3842BN (AN). See UPS diagram below. (Click on it to enlarge) The voltages that were already supplied by the working UPS are marked in red. Please note that you need to measure the 25V voltage not relative to the common minus, namely from the points V1 +, V1- and also V2 +, V2- they are not connected to the common bus.

The UPS key is made on a transistor, field 4N90C. In my case, the transistor remained intact, but the microcircuit required replacement. There was also an open circuit resistor R 010 - 22 Om / 1Wt. After that, the power supply unit started working.

However, it was too early to rejoice, having measured the voltage at the output of the welder, it turned out that it was not there, and in idle mode it should be about 85 volts. I tried to move the board, remember from the words of the owner it affected, but nothing.

Further searches revealed the absence of one of the voltages of 25 volts at points V2-, V2 +. The reason is an open circuit in the winding transformer 1-2. Had to drink a trance, used a medical needle to release the conclusions.

In the transformer, one of the ends of the winding was cut off from the terminal.

We carefully restore the connection using a suitable wiring, the restored connection will not be superfluous to fix it with a drop of glue or sealant. I had polyurethane glue at my fingertips and used it, we revise other conclusions, if necessary, we solder.

Before installing the transformer, you should prepare the board so that it fits into its place without effort. To do this, you need to clean the holes from the remnants of solder; this can also be done with a needle from a syringe of a suitable diameter.

After installing the transformer, the welding inverter started working.

How to check the microcircuit without unsoldering it from the board and what else to pay attention to.

You can partially check the microcircuit if you have a voltmeter and an adjustable stabilized constant voltage source.A signal generator and oscilloscope are required for a complete test.

Let's talk about what is easier. Be sure to turn off the power to the inverter before checking. Further - from the external regulated power supply to pin 7 of the microcircuit, we apply a voltage of 16 - 17 volts, this is the starting voltage of the MS. In this case, at pin 8 there should be 5 V. this is the reference voltage from the internal stabilizer of the microcircuit.

It should remain stable when the voltage changes at pin 7. If not, the MS is faulty.

When changing the voltage on the microcircuit, keep in mind that below 10 V, the microcircuit turns off, and turns on at 15-17 volts. You should not increase the supply voltage of the MS above 34 V There is a protective zener diode inside the microcircuit and if the voltage is too high, it will simply break through.

Below is a block diagram of the UC3842.

Addendum to this article: After a while, another apparatus was brought. Out of order due to falling on its side. This happened because during the operation the screws holding the case loosened, and some were simply lost, so when the board fell, it played and touched the case with the mounting side.As a result of the short circuit, all 4 output transistors K 30N60HS failed. Analogs G30N60A4D, G40N60UFD. After the replacement, everything worked.

Video (click to play).

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