DIY radio panel repair

You can't do without repairs, and as a result, the panel was opened.

So, we snap off the connectors of the panel and see that the contacts are slightly oxidized, we immediately wipe them with a solvent.

We unscrew further - we carefully snap off the latches that connect the halves of the panel body. We disassemble and see that inside the lower keys are squeezed from the fact that the paralon was compressed from time to time, we knead it and all the buzz, but most likely this will happen every year, approximately.

Next, stretch the springs on the joystick. We wipe all areas with wet wipes made of pressed paper for the monitor. We wipe everything from dust, including the transparent display.

The main thing to remember is how and what stood, there are a lot of nodes and, oddly enough, there are many options for positions, how all this can be assembled - not put in the wrong place. Therefore, before disassembling everything, I photographed everything, and then just leafed through the photos in reverse order and collected it.

So, cleaned, assembled, installed, checked - everything works! There are no more rebuts, everything is clear and reliable. Some keys are tinted with black marker for disks.

He paints perfectly - not even distinguishable, and by its mechanical properties it is durable, does not wear off for a long time, is moisture resistant and generally dries quickly. You can touch up, and in a couple of minutes you can use it! Comrade was with you. Redmoon.

Aradio is a very common electronic device. With rare exceptions, this undoubtedly useful device is not present in the car. The evolution of car radios is the video recorder and the car CD / MP3 player. But despite changing the recording medium in a car player, these devices are still referred to by the familiar word. car radio... It has been well established since the massive use of car cassette players.

Danny the section of the site is devoted to the issues of repairing car radios with your own hands. It's no secret that car players of various modifications and manufacturers break down.

Non the pages This section will not be a simple listing of specific malfunctions of certain car radio models, but methods of repair and restoration of these devices will be revealed. The presentation will be conducted without interrupting practice, with examples of repairing specific models of car turntables.

Introduction article. It describes the necessary devices that will be required in the process of repairing car radios.

How to connect a car radio or car CD / MP3 receiver to a computer power supply (PSU)? Anyone who wants to "power" a car radio from a 220V network faces this question. This makes sense if you plan to repair the car radio or upgrade it to a stationary music center.

Here you will learn about typical car player malfunctions and their causes.

What is a complex malfunction and how can error codes help in car radio repair? A real example of troubleshooting a complex malfunction of the Pioneer DEH-P3500MP car CD receiver.

When repairing disc car radios, it is often necessary to disassemble the CD mechanism. Shown in detail is the method of disassembling the CD mechanism, which is widespread among modern car CD / MP3 players.

CD drives for car receivers of different brands differ in their design. This means that you need to be able to disassemble CD mechanisms of different types. Here you will learn how to disassemble the CD drive of the Kenwood car radio without errors.

An article that tells about one of the typical malfunctions of car CD / MP3-receivers - there is no display backlight. How to eliminate this breakdown will be discussed.

Here we talk about an atypical breakdown of the Mystery MCD-778MP car CD / MP3 receiver. A real example of repair using an oscilloscope.

The volume control of the car radio does not work? The knob may be the cause of the problem. The rotary encoder is very often used in digital equipment to adjust various functions and control the device. Is it really necessary to replace the rotary encoder if it does not work correctly? How to restore the correct operation of the knob and avoid replacing it is described in this article.

In the practice of repairing car players and CD-receivers, there are times when you need a schematic diagram, information on the pinout of the connector or a table for decoding error codes. This information is contained in the service manual for a specific car radio model. You can download the service manual for some models of popular car radios by clicking on the link above.

Which brand of car radio should you choose? Read this article and this question will disappear forever.

Find out about the device of SD / MP3 car receivers. Among all kinds of modifications of car radios, so-called flash car radios have found their place under the sun. This article examines the device and the elemental composition of car SD / MP3-receivers without a disk using the example of the Velas V-201U model.

The car radio, like any other device or mechanism in the car, can fail. As practice shows, the repair of car radios is usually carried out in the event of improper operation of the device or in the event of malfunctions not related to use. In this article, we suggest that you familiarize yourself with the main causes and methods of eliminating audio system breakdowns.

It's no secret that over time, the mechanical elements of a multimedia system tend to wear out. So, if the system does not turn on or off, it is necessary to either repair or replace it.

But first, let's figure out the main reasons why the radio tape recorder does not work:

1. Dirty device. If the radio tape recorder stops working, this may be due to contamination of the mechanisms - dirt or dust can accumulate between them, especially if the system is used in harsh conditions. As a rule, optical or mechanical components break in this case. One of the signs of contamination is a disc that is stuck and cannot play properly.
2. Also, mechanical failures can be the reason. This type of failure is usually associated with the power circuit. If the connection of the head unit was made incorrectly initially, or the electrical circuit is characterized by sharp drops, then there is nothing to be surprised at. The first symptom of problems with the power circuit is the lack of screen backlighting or the inability to start the radio.

Car audio system board

Before removing the radio from the car and starting to repair it, read the list of faults specific to audio systems. Getting and repairing the car radio from the car is not such a problem, but before you take it out, you need to know exactly what to repair.

1. Perhaps the problem is the lack of power at +5. If you decide to get the device and repair it yourself, first of all you need to pay attention to diagnostics of the second contact of the CN701 connector. It should have a voltage in positive territory of 14 volts, this voltage should be transmitted to the collectors of the transistors. If there is no voltage, repairing car radios consists in replacing transistors or a zener diode.
2. There is no power activation signal. Before repairing car radios, you need to check the voltage of + 4.8 volts at the fortieth contact of the IZ901 controller.You should also check for a pulse on the third contact of the controller.

Dialing a multimedia system with a multimeter

Repair of car radios on your own or by a specialist is required if there is no sound volume or when the volume is increased and the tracks are played, the sound fills.

There may be several options:

Why does the radio tape recorder not read a USB flash drive or disc after starting the engine? The disk is stuck, stutters, the system does not see the USB flash drive?

The reasons may be as follows:

1. The radio tape recorder does not read the USB flash drive, does not see the disc, or the disc stutters or is stuck after starting the engine. Perhaps the device simply does not understand the recording format. Repair of radio tape recorders in this case is not required, you just need to burn the disc in a different format.
2. If the system does not see the disc when starting the engine, the disc is stuck, stutters or heats up, this may be due to contamination of the optical lens. As mentioned above, problems in the operation of buttons and the device as a whole after starting the engine can be associated with dirt. In this case, the problem is solved by using a special cleaning disc. The operation of such a disk is carried out in accordance with the requirements specified in the instructions. You can self-clean the system by blowing the elements or cleaning with a cotton swab.
3. Another reason may be the lack of laser current; you can get rid of such a malfunction by adjusting it.
4. Inoperability of loops and wires. Perhaps, during the operation of the car, the screws inside the structure simply loosened, or it could be a leakage of resistors.

Buttons do not work - there are several reasons. First, it may be mechanical damage to the buttons. To restore the functionality of the buttons, you need to disassemble the front panel and check the condition of the contacts. Perhaps the contacts from the buttons simply leave and they need to be re-soldered. If the button is inoperative, then it will have to be changed.

Secondly, the problem with the buttons may be due to a software malfunction. The malfunction is solved by rebooting the audio system and returning its functionality to the factory configuration. All settings will be erased from memory. After returning to factory settings, the device must be turned off for a few minutes.

If the radio tape recorder heats up and turns off arbitrarily, there may be several reasons:

1. The system heats up and shuts down as a result of poor power supply. Lack of power will cause the radio to turn off arbitrarily, or this is due to power failures. When the radio tape recorder heats up and turns off, you need to check the power cable - it may just come off or break, then it will have to be changed.
2. The device heats up due to poor ventilation and turns off when overheated. If the system heats up, this indicates insufficient ventilation. Such a malfunction is relevant for Pioneer radio tape recorders and, as car owners of such systems assure, there is nothing to worry about. But if the system heats up constantly and turns off at the same time, you need to think about additional ventilation.
3. Sometimes the device turns off due to software glitch. You can try to solve such a malfunction by resetting the radio to factory settings.

No electronic device, including a car radio, can last forever. No matter how high-quality the audio system is, it can fail, and there can be many reasons for this. In what cases the car radios are repaired, and what malfunctions are typical for head units - we will talk about this below.

For what reasons, the radio tape recorder in the car does not work and turns off when the engine is started, why does the device not turn on, does not see or read a USB flash drive, fonit and stutters, warms up?

First, we suggest that you familiarize yourself with the main causes of malfunctions:

1. The system stopped working due to contamination of the internal mechanisms. If the radio is used in harsh conditions, dust and dirt can accumulate inside, and this, in turn, can cause damage to both optical and mechanical components of the device. If a disc is stuck in the device, then this is most likely due to pollution.
2. The reason for inoperability can also be mechanical malfunctions, as practice shows, in this case, malfunctions are usually associated with the power circuit. Such problems can be caused by incorrect connection of the system. The system may not have enough power, causing it to turn off when the volume is turned up.
3. Fuse blown. As you know, fuses and relays are responsible for the operation of all electrical appliances in a car. It is possible that the fuse installed on the car radio itself is out of order.
4. Failure of the device itself.

So, how to get the head unit and repair the radio with your own hands, we suggest learning about the main problems in the operation of the systems, as well as options for their elimination. Where to get your car radio repaired? In any specialized service center, but now we propose to find out how to repair such a system at home.

What reasons can lead to such a malfunction:

1. In most cases, the reason lies in the fact that +5 power is not supplied to the device. In this case, after dismantling and disassembling the device, check the pin number 2 on the CN701 connector. A voltage of 14 volts should be applied to this contact, subsequently it goes to the collector elements of the transistors. In the event that there is no voltage, then most likely you will have to change the transistors or zener diode.
2. No power-on signal. In this case, the diagnostics is reduced to checking the voltage level at pin 40 of the IZ901 controller. In addition, we also recommend that you make sure that a signal is received at contact number 3 (the author of the video is Dmitry Epishev).

If the audio system is working, but there is no sound, or the sound is muted or phonet, then there can be many reasons.

They all depend on the specific situation:

Why does the head unit not play data from a memory card or disc, how to remove it if it is stuck?

Such a malfunction can occur for the following reasons:

1. Most often, such problems are associated with the fact that the audio system does not perceive the format of a music track recorded on a disc or flash drive. There is no need to repair such a radio; you need to record music in a different format.
2. Often, problems with playing tracks, as well as stuttering discs, are caused by dirty optical components, in particular, we are talking about the lens. If the system really does not function due to contamination, then this problem can be solved by installing a special cleaning disc in the drive. Read the instruction manual for the disc before use. If such cleaning does not help, then you can try to blow through the internal components of the system with a vacuum cleaner or disassemble the device and clean the optical lens with a piece of cotton wool.
3. The problem may be due to a lack of laser current. In this case, you can get rid of the malfunction by adjusting the laser beam.
4. Malfunctions in the wiring or loops. In the course of prolonged use, the screws in the structure of the device may loosen, in which case they just need to be tightened. If there is a leak in the operation of the resistor elements, then the damaged parts must be replaced.

If the buttons do not work, then first of all this may be due to their mechanical damage. In order to get rid of such a problem, you will have to disassemble the device, in particular, you will need the front panel on which these buttons are installed. After parsing, it is necessary to diagnose the state of the elements - there is a possibility that the malfunction is associated with the disconnection of the contacts. If so, then they need to be re-soldered.In the event that the button is out of order and nothing can be done, then it will need to be changed (the author of the video is the Radioblogful channel. The solder's video blog).

In addition, the inoperability of the buttons is often associated with malfunctions in the software part. With such problems, you can try to restart the device, if this does not help, then you need to return its settings to the factory settings. Naturally, this will remove all configuration from memory. If you return the device to the factory configuration, then before further use it will need to be turned off for 2-3 minutes.

What to do if the audio system is constantly warming up and turns off on its own:

1. The failure of such a plan may be due to poor nutrition. If there is no power, then the radio will not start, but if we are talking about power failures, the device will turn off for no reason. First of all, you should diagnose the supply wire - there is a possibility that it has moved away from the connector or is damaged, in the latter case, the wire must be replaced.
2. The car radio can overheat due to inadequate ventilation, and as a result of overheating, it will, of course, turn off. Judging by the reviews of our compatriots, such problems are more relevant for head devices from the Pioneer manufacturer, in which case overheating will not come in serious problems. If the device heats up very much, and also turns off arbitrarily, then you should consider additional ventilation for the system.
3. Malfunctions in the operation of the device can also be caused by malfunctions in the software part. In this case, again, you can try resetting the entire system configuration to the factory default.

The video below shows the procedure for repairing the Pioneer radio tape recorder, in which there is no sound (the author of the video is the Radioblogful channel. Video blog of the solder).

The car radio is subject to constant vibrations while the car is moving, which only contributes to its rapid failure.

Car radio does not turn on at all. This may be due to a lack of power. You can check the power yourself or by contacting an auto electrician service center. If the reason lies not in the diet and everything is in order with it, it is necessary to carry out a diagnosis.

The absence or disappearance of the backlight of the control panel. Cause: this malfunction may indicate that the light sources (LEDs or bulbs) or the power supply circuit of the control panel are out of order.

The car radio does not read at all (the inscription NO DISK or ERROR pops up) or reads discs poorly CD or DVD... The cause of this malfunction may lie in the laser head, the motor spinning the disc, or in the main control board.

When the car is shaking while driving (on a dirt road, for example), the disc reading gets lost. Reason: this defect may be associated with a breakdown of the shock absorbers of the radio or laser head. Eliminate the malfunction by repair in the in-patient workshop.

The car radio is working properly, but there is no sound on one or all channels. It is necessary to check the performance of the speakers in the in-patient service center. If everything is in order with the speaker, then the malfunction may be associated with a failure of the power supply circuits or the preamplifier of the car radio, as well as its output stage.

The inscription "Please code" pops up. This means that the problem lies in the factory reset. To eliminate this, you need to enter the code for the head unit. Contact the service center.

V CD / DVD car radios the disc does not load or unload. The cause of the breakdown may lie in the disc loading motor, its control, power supply or in the pressure roller. As a result, the disc may slip and not be seized. It is also worth checking the disc sensors.

Many car enthusiasts do not pay enough attention to cleaning the dashboard of the car radio from dirt and dust. Heavy contamination of this appliance can also cause frequent and unexpected breakdowns.Dust and dirt clogs the openings and exits of the car radio, therefore, inevitable contamination of the optics and mechanics occurs. "Symptoms" in this case will be frequent freezes, failures during playback and not loading a disc or USB-flash drive. You can fix the damage yourself: disassemble and clean the lens of the laser reader.

Failures associated with the supply circuits can lead to the device not turning on at all or no functioning of any modes (no display backlight or no sound or CD mode). The absence of sound may indicate that the UMZCH burned out. In such cases, check the protective fuse, inspect the printed circuit board, inspect the microcircuits for damage to the case (deformation, chips or cracks). Electrolytic capacitors may have swollen or tracks burned out.

If nothing was found visually, then it is better to contact a specialist, since attempts to eliminate the malfunction on your own can lead to even greater problems.

Autoradio tape recorder Supra SCD-304U, does not read USB and microSD disks. He sees that the connector is connected, shows on the board that there is a medium, but does not read the files. What can you suggest. Thank you.

The laser head may be defective or dirty.

What does the laser head have to do with it? She reads flash drives.

If the laser is faulty, then neither discs nor flash drives will be read.

Victor, don’t be offended, but don’t mislead, and here is the disc to the flash drive, if the laser is dead then the discs will certainly not be read, but you can even remove the laser, but the flash drives must be read a hundred percent, these are two different systems, by the way. I have a radio tape recorder on the run now, it works from a flash drive and the laser loop is not even inserted.

It's clear. We must try to clean it. Do not give a link on how to do it correctly.

Good day. I have a Eurotec EU-9991DVD radio tape recorder. The problem is that the disc does not load. I found a badly soldered connector on the boot engine, soldered it, started assembling and saw a burned out resistor on the main board, next to the connector of the loop going to the CD drive board. I can't find the circuit for the radio tape recorder. The question is, can the download fail because of this resistor? And how to guess its denomination?

Hey! Maybe, of course, a diagram is needed.

Can you have any sources where you can find the circuit?

And then I have all to no avail.

Hello. I have a sony cdx gt457ue radio tape recorder and only the button of which brings out the disc in the middle of the drive, and the display backlight itself ... the inscriptions are sooo poorly visible on the display, only at a certain angle. and so ... I put the socket from it on the sony cdx gt450ue radio tape recorder and everything glows and shows on it. I put the socket from 450 to 457 again the same problem with the backlight. I think that the problem is in the radio itself. how can you repair it, and will it work out yourself without resorting to the help of a master? Thank you)

Hey! I can't say specifically, perhaps the panel power contacts are unsoldered. It is, of course, better not to bother yourself.

Good afternoon. Sony's radio tape recorder, The buttons are messed up, you press the button to turn on does not turn on, you press the button to release the disc, it turns on, and with the same button it switches from SD, to radio, to usb
no more buttons do not work and the sound is also not reduced or added. sings like the last time the sound was
it turns off itself, and immediately turns on and starts switching SD, to the radio, to usb
it was once driving, it turned off, then it turned on, immediately the disk went out and everything worked right away, then again after three days everything returned,
Tell me what could be?, Or where to find the reason

Hello Anton! In car radios, over time, problems arise with the buttons - they wear out and lose conductivity, so when you press one button, the other takes place. Replace all buttons in the panel.

Good afternoon.On my ff2, the head unit suddenly started asking me to enter the code I entered, it worked and so twice, but now I enter the code, the screen goes out for a couple of seconds and again let the code stop turning on in general, can you tell me it's worth bothering with the repair?

Hey! Probably the firmware has flown. The workshop will be eliminated.

Hello Victor, on my pioneer p88rs radio tape recorder, when the volume is increased from 5 to 20, a crack appears in the right front speaker, I checked it with the low frequency and the line-out in the same way. After 20, everything is fine. The speaker changed to another the same thing, what could be? Thank you.

If there is also a crackle from the line, then the preamplifier.

hello!
My problem is this - Akum is charging and I turned on the radio, it played for 5 minutes and then turned off. I think from overvoltage.
Sony radio tape recorder.
Where to look first.
And also, when I connect + s- it sparks for a moment and the screen blinks slightly (if it is overlooked).
Know that something burned out on the board? help I will be grateful! !!

Hey! open, see power circuits.

do not know where to look. where to pick with a tester. ))?
Something is shorting, and there is still a question: how to check the capacitor? it feels like - + somewhere overflowed. or something burned out that the current is like,

call the power chain from the start. swollen conduits change.

Good afternoon. Immediately I apologize for the question, maybe I am far from an electrician, but to do diagnostics for thousands of kilometers from the words is not gut. I just want to know the direction of the problem so that the master is not lit up.
Native radio tape recorder, regular speakers. After a while, only one speaker began to wheeze on the bass. After a while, she fell silent. I rearranged a new column in its place, a week later everything was the same: first wheezing, then dying. So covered 3 columns. Is there a problem in the wiring or maybe in the radio? The time of dying with wheezing is about a month.

Hey! Maybe in the wiring, maybe in the radio. In the radio, check the output on which the speakers burn out.

Thank you. Let's search with mother-of-pearl buttons

hello. )
I have essentially the same problem with the LG lcf620ip radio tape recorder, the problem appeared in the usb port and then after its cd mp3, so the power is on usb and he does not even see it on the display. drip .. you wrote here that maybe the head of the laser can be hammered, I used it very little so that there is very little dust or not?

I will also add that he writes error on cd mp3 and by the sound he does not even want to start the disc ... and with the speaker there is an impulsive sound of medium frequencies .. can you tell me if you can fix problems with your hands not from your ass) do I know a little about electrics?

Perhaps a laser, perhaps a motor ... so I won't answer, you have to look.

thanks ... I'll check ... if no, I'll give it to the specialists ... most likely the chip needs to be inserted through the programmer, I don't have such equipment and I don't know which chip ... as I understand it, by blowing the laser head, the repair with my own hands will end with me /..= (damn

good afternoon, buttons on the car radio are spontaneously pressed.
when playing from a flash drive, it spontaneously switches to the next track
in the radio, the search for stations is turned on, the band is switched, the TA mode is turned on / off
either just turns on if it was turned on

sometimes spontaneous pressing occurs either when you hit a bump, or by itself

Hey! Replace buttons. The buttons get dirty over time and this situation begins.

there are microswitches, I disassembled one of them, the one that was most often pressed spontaneously - inside it looks clean. I did not collect it back, I left it on the board. And all the same, this button, which does not have, is spontaneously pressed

Perhaps somewhere on the board there is a cold soldering or a firmware update.

I examined it with my naked eye, I didn’t find cold rations. If the buttons squeeze when hitting on bumps, then it is logical that the reason is cold soldering.
And if it's still a firmware, what can I do with it?

If the buttons squeeze when hitting on bumps, then it is logical to assume that the buttons are dirty and must be replaced!

Hello! I have such a problem, I turn on the radio tape recorder, and only the volume roller lights up and goes out, the display does not light up, the last thing I did was add loud music, she played and went out of silence, what can I do, can I repair it?

Hey! It can be repaired ... maybe the electrolytic capacitors or the sound microcircuit are out of order.

Hello! I have such a problem. the Soundmax radio tape recorder worked well, after the start it turned off and the sound began to freeze. after it turned off, and now when the power is turned on, the display comes out and the backlight is on and no more action. Buttons do not work, only cuts. What could be the problem?

Hello. Tell me please. I bought an NRG NDV-401 car radio and dropped it during installation with my holes full of hands. After I connected it. The flash drive reads but there is no sound. What is the reason?

Hey! Well, the simplest thing is that something has been sealed off from the blow or has fallen off. It is necessary to open and view the tracks and details.

Hello! I bought a mafon almost the same as my old cat. glitched. I connected the connectors with power supply and speakers for testing. It turned on normally. I set up an FM channel, checked all the speakers, TV too, Navigation Map. The disc was native. While studying the oa went out. Includes a cooler and backlight. Nothing Head tilts. Radio c6001 nkcp-d59 What could be? Thanks! Fedor.

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The tape recorder in the car is an integral part of it. After all, boring hours behind the wheel, accompanied by incendiary music, pass much faster.
You should also not forget about country trips. For example, barbecue in a cozy quiet country place in a friendly company.
Music will help to while away the time of cooking meat and will give some dynamism to the rest. Pioneer car radios require frequent repairs over time and some practical understanding of the whole process is needed.
There is nothing complicated in its structure, the main thing is to understand the general principle of functioning. Do-it-yourself pioneer car radio repair is presented below.

Pioneer car radio repair

In practice, all pioneer car radios are classified in the category of increased complexity from the point of view of the device. There are a number of factors that can cause your car sound system to malfunction prematurely.
In this regard, it is necessary to be able to both diagnose a malfunction and fix it.

• first you need to make sure that the supply voltage is within 12-14 V;
• then you need to make sure that the fuse and throttle are working - L951;
• diodes D951 and D952 perform a protective function, therefore, their proper functioning should also be verified;
• the voltage of the Q952 stabilizer must be 5 V, otherwise, the device is faulty;
• sensors Q601 and Q602 may suddenly stop functioning and, as a result, the whole car radio will also stop working;
• at the 68 MKIC601 output, the supply voltage must be equal to 5 volts, at the same output there must always be a log.1 signal;
• a key is located on the Q609 transistor, the serviceability of which must also be checked;
• The pioneer car radio is equipped with two quartz oscillators MK and KK, which also need to be checked for serviceability.

Note. When searching for the cause of the malfunction that led to the pioneer car radio not turning on, it is imperative to adhere to the sequence presented above.

What should be done if the cause of the malfunction could not be found:

• it is of paramount importance to check the pulse, which is enclosed in the control digital bus;
• the digital control bus is located in the space between the removable panel and the MK;
• if there is no pulse, then the cause of the malfunction lies in the IC601 or IC901 microcontroller.

• first you need to check the suspension of the power lamp, or rather its circuit;
• often, when the removable panel has a loose connection, it is necessary to check the corresponding connection connector;
• on transistors Q960 and Q961 there is a key, the serviceability of which must also be checked;
• along with this, make sure that the IC601 output has an ILPW signal.

Algorithm for checking if there is no sound in all playback modes:

• at the output of microcircuit 6, 20, the supply voltage should be 14 volts
• at the output of 4 and 22 UMZCH, the supply voltage should be equal to 5 volts;
• the final stage of the test is to determine the sound signal IC201 at the following outputs of the microcircuit: 18, 19, 30, 31;
• if there is no sound signal, then it must be checked at the input of IC201, and also check whether the signal at the output of MK 25 and 27 passes the signal to the control bus;
• if a signal passes at all of the above outputs, then the malfunction is in the IC201 microcircuit;
• It is also important not to forget to make sure that there is no voltage at the output 22 of IC301, which is located on the MUTE formation circuit.

If there is no sound during the production of a media file from a magnetic tape, it is necessary to check the degree of its mobility, if there is any at all. If the tape is stationary, it must be urgently replaced.
If there is no sound, and the magnetic tape is in a moving state, you must proceed to the next stage of the check:

• the connecting wires of pioneer car radios are often subject to mechanical damage, so they must be checked with a special degree of care;
• if a defect in the connecting wires is not found, then it is necessary to check the passage of the audio signal on the IC251 and IC201 microcircuits.

Sometimes the cause of a car radio malfunction may lie in the AM tuner:

• first you need to make sure that the URCH elements: Q201 and Q202 are in good condition;
• the LOCL signal must be present on the tuner 23 loop;
• in rare cases, the reason for this may be the assembly of the D202 diodes;
• the final stage of checking the AM tuner serviceability is to establish the presence or absence of a malfunction in the CF51 and CF232 sound band filters.

The question arises, how to repair the car radio?
The answer is extremely simple: the essence of the repair is to find the faulty element and replace it. Inspection is the main tool that will determine if a part is functioning properly or not at all.

Note. The main thing is not to forget that the essence of the repair is to find an item that is in a faulty condition, and then replace it.

Do-it-yourself pioneer car recorder repair instructions are simple, however, it contains a huge number of nuances. To carry out repairs in practice, the use of photo and video materials is a prerequisite.
The price of self-replacement is significantly lower than that in a car service, since in practice the car service will not look for a malfunction in the car radio, instead, it will be completely replaced, which will certainly not cost a penny.

REPAIR CARS SONY

On this beautiful sunny day off I decided to take a break from electronics and go to the garden. The field, the sun, light clouds float across the sky, a warm breeze is blowing and nothing portends another combat mission. Suddenly the mobile phone rings and begins: listen, help, eh. be a friend. help out bro. just going to the sea .. and so on in the same spirit. Well, since such urgent matters, immediately upon returning I go into the room and see on the patient's table - a SONY car radio with DVD, CD, MP3, VCD, USB and other bells and whistles. In addition, the mosfet amplifier and remote control.The device is completely new - as it turned out, it was just brought from abroad.

We proceed to the inspection. According to the owner, the backlight of the display suddenly disappeared, despite the fact that the LEDs on the buttons glow properly. The warranty naturally does not expire, so do not take the car radio back abroad.

We start repairing. Judging by the diagram on the radio case, power is supplied via two wires: main and auxiliary. Maybe a fuse?

The freebie did not pass - both fuses are normal, which is a pity :) We disassemble the car radio and start an internal inspection. Contacts - contact, loops are normal, power can be traced right up to the removable panel. We will disassemble it and check the backlight.

Previously, the backlight of such LCD indicators was equipped with a kind of luminescent lamps, which were powered by a small high-voltage converter (they had to be repaired in PIONIER car radios). But progress does not stand still, LEDs are replacing CFLs and in this case the indicator is illuminated by two flat, powerful white LEDs.

We supply them with a supply voltage from a power supply with an exposed current limitation of 10mA, and lo and behold! They glow! This is separately, but together they do not want to. Conclusion: a thin path has cracked, connecting them in series. So we take a piece of MGTF wire (my favorite) and connect these LEDs. Now everything is shining and working OK.

It remains to assemble the insides in the reverse order, and be careful with the loops, and give the repaired SONY car radio to its owner. Of course, “cracked track” sounds frivolous, and let a person think that the power stabilizer has burned out when he reaches into his pocket for ten bucks. It turned out 10 centimeters of wire for $ 10. I understand that the amount is ridiculous, but still familiar.