How to repair a Pioneer car radio

Doesn't turn on

To repair the radio, you need to find out the cause of the malfunction.

The device must be inspected in the following order:

• check the supply voltage, it should be within 12-14 V;
• make sure that the throttle and fuse L951 are working properly;
• make sure that the diodes performing the protective function comply with groups D951 and D952;
• measure the voltage of the Q952 stabilizer, which should be 5 V;
• inspect sensors Q601 and Q602: if they do not work, the radio cannot play music;
• make sure that the supply voltage at output 68 of MKIC601 is 5 V;
• check if there is a switch on transistor Q609;
• see if 2 quartz oscillators MK and KK work well.

If you do not find a problem, check the pulse contained in the digital bus, which is located in the space between the removable panel and the MK generator. If there is no power, the microcontroller IC601 or IC901 must be replaced.

No display backlight

If there is no screen lighting, you need to check the supply voltage +5V, +14V on the second pin of the CN701 connector. It must enter the collector circuit of the output transistors. If there is no +14V voltage, the zener diode or one of the transistors may not be performing its functions.

Repairing a Pioneer radio consists of checking with a multimeter and replacing the damaged part if necessary.

Pioneer MVH-08UBG and error “ERROR-23”

By the way, when testing playback from a USB flash drive, the error “ERROR-23” was displayed. If you encounter the same error, not necessarily on this radio model, then to fix it you just need to format the flash drive to the FAT32 file system, as shown in the screenshots below.

After this, “ERROR-23” will disappear, and if not, then your flash drive is formatted for loading and installation from it on a Windows computer or another operating system. In this case, download the Rufus program and format the flash drive using the “Non-Boot Image” method, as in the picture below.

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Buttons don't work

The main reasons why car radio buttons may not work:

• The player cable is damaged.
• There is no contact, the soldering is broken.
• The fuse or resistor is broken.
• The connection points of the buttons and the contact board are dirty.

The burnt resistor must be removed, then a new part must be installed by soldering.

Fuses ensure trouble-free operation of vehicle equipment.

They can burn out due to voltage surges in the network.

Damaged fuses can be detected using a phase indicator. After this, they must be replaced with new ones.

You can detect a fuse that has blown as a result of voltage surges using the same phase indicator.

If the contact board is dirty or you accidentally spilled liquid on the instrument panel, there is no need to repair the Pioneer car radio. It will be enough to remove the panel and wipe the board and button contacts with a cotton swab moistened with alcohol or cleaning fluid.

No sound or strong background

If the sound disappears or noise is heard instead of the melody in all playback modes, you need to inspect the device for damage in the following order:

Sometimes the car radio may not work due to malfunctions in the AM tuner. Check out its components, including:

• URCH elements Q201 and Q202;
• LOCL signal on tuner circuit 23;
• diodes D202;
• audio band filters CF51 and CF232.

A description of the disturbance in the sound of melodies will help narrow down the search area for damage in the system:

• If the sound disappears when starting the engine or after increasing the volume of the tone, it means that the Stand-By signal is missing. Check the +4.8V pulse on pin 4 of IC901. When there is no pulse, you need to change the controller. It will also be useful to examine the strength of the power amplifier contacts.
• When the device heats up and hisses as the sound volume increases, you need to monitor the voltage in the base circuit of the output transistors. It should be different from 0. If there is no voltage, then the transistors are faulty. Noise may also appear due to malfunctions in the controller, transistor Q802, or mute button.

You can repair the sound processor by replacing the found damaged element.

Pioneer car radio repair - restoration method

Pioneer car radio repair - as everyone knows, nothing lasts forever. Likewise, car audio equipment tends to gradually wear out. In this article we will look at ways to troubleshoot a car radio. For example, when the head unit cannot turn on or turns off during operation.

The first step is to find out the main reasons why the device does not work:

1. One of the main signs of a head unit not working is simple contamination of its mechanical components. When using the radio in difficult conditions, dust can get inside the case and thereby damage components and elements for optical and mechanical purposes. One of the proofs of the formation of dirt on the mechanisms is the braking of the disc and its inability to correctly reproduce music.

2. The next factor that determines why the car radio does not turn on is technical faults. Such a breakdown may include the supply voltage path. This problem occurs as a result of incorrect initial connection of the head unit. The lack of illumination of the radio scale or the inability to turn it on is the first sign of a malfunction in the supply voltage circuit.

Car radio printed circuit board

Inoperability and recovery methods

Before you start repairing the pioneer car radio and removing it from the car, try to study the main malfunctions that occur in radio equipment. After all, before starting repairs, you should definitely know what exactly needs to be repaired.

There is no display backlight or the radio does not turn on

1. With this symptom, the first thing you need to do is check the presence of +5v supply voltage. Then we check the +14v voltage on the second pin of connector CN701, which goes to the collector circuit of the output transistors. If there is no +14v voltage, most likely one of the transistors or a zener diode has failed.

2. No supply voltage signal. In this case, the IX901 controller is checked, in particular its fortieth contact, which should have a voltage of +4.8v. In addition, there must be a pulse voltage at the third contact of the controller.

Pioneer car radio repair - dialing with a multimeter

The head unit turns on, but there is no sound or strong background noise

There are many options for such a malfunction:

1. When starting the engine there is no sound or when you turn up the volume it disappears. As a rule, this problem is created due to the lack of a Stand-By signal. In case of such a malfunction, the presence of a + 4.8v pulse is checked on pin 4 of the IC901 microcircuit. If there is no sound or pulse, then most likely the problem is in the controller and it must be replaced. In addition, if the sound disappears when starting the engine or increasing the volume, you need to check the reliability of the power amplifier contacts.

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2. When starting the engine, the sound is colored with a strong background.
In the case when a hum appears when the sound volume increases, it is necessary to determine the presence of voltage in the base circuit of the output transistors. The voltage values ​​at the base terminals of the transistors must differ from zero. If the sound acquires a background hue when the volume is increased, and there is no voltage at the bases of the transistors, then this may indicate a malfunction of the transistors. Another reason for the appearance of background noise when the sound volume is increased may be a malfunction of the mute button or damage to the controller itself. Also, with such a problem, transistor Q802 must be checked. 3. Malfunctions in the sound path of the radio may appear due to problems with the capacitors installed in the circuit, so they also need to be checked. Any module in the system through which the audio signal circuit passes must be tested from the input stage to the output.

The device does not read CDs

Sometimes there are situations when the head unit does not read a flash drive or CD after the car engine has started. Either the disk is jammed in the drive, or playback is intermittent, the device does not see the flash drive.

The reasons causing such problems may be the following:

1. It is possible that the playback device is simply unfamiliar with the format in which the recording was made. Try a different disc format.

2. When, when starting the engine, the system cannot detect the disc or it is jammed in the drive, intermittent playback. This can happen due to dust getting on the optical lens. Everything is clear here - you need to remove all the dirt using improvised means, and for the best effect, use a special cleaning disk.

3. Also, another possible reason may be the lack of voltage on the laser. If there is such a malfunction, you need to try to adjust it.

4. One of the reasons for system failure may be the deterioration of wires or cables. Even during the operation of the car, the fastening screws inside the device become loose, which leads to distortion of the structure.

Doesn't read flash drive

It often happens that the radio does not see a flash drive or CD after starting the car engine. Sometimes the disc gets stuck in the drive or the melody plays intermittently.

Such problems can be caused by the following reasons:

Please remember that if repaired improperly, your Pioneer radio may become unsuitable for further use. If difficulties arise, it is better to have the radio repaired at a service center.

The tape recorder in a car is an integral part of it. After all, boring hours behind the wheel, accompanied by lively music, pass much faster. Don't forget about out-of-town trips either. For example, barbecue in a cozy, quiet country place in a friendly company. Music will help pass the time of cooking meat and give the rest some dynamism. Pioneer car radios require repairs quite often over time and some practical understanding of the entire process is required. There is nothing complicated in its structure; the main thing is to understand the general principle of operation. Do-it-yourself repair of a pioneer car radio is presented below.

A practical look at the general structure and functioning of a pioneer car radio

Pioneer car radio repair

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

Procedure if the pioneer car radio does not turn on

• first you need to make sure that the supply voltage is within 12-14 V;
• Next, you need to make sure that the fuse and throttle are in good condition - L951;
• diodes D951 and D952 perform a protective function, so you should also make sure that they are functioning properly;
• the voltage of the Q952 stabilizer must be equal to 5 V, otherwise the device is faulty;
• sensors Q601 and Q602 may suddenly stop functioning and, as a result, the entire car radio will also stop working;
• at output 68 MKIC601 the supply voltage should be equal to 5 volts, and a logic 1 signal should always be present at the same output;
• there is a switch located on transistor Q609, the serviceability of which also needs to 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 stopping turning on, it is imperative to follow the sequence presented above.

What needs to be done if the causes of the malfunction cannot be found:

• the first thing that needs to be done is to check the pulse contained in the control digital bus;
• the digital control bus is located in the spatial gap between the removable panel and the MK;
• if there is no pulse, then the cause of the malfunction lies in the microcontroller IC601 or IC901.

The suspension on the removable panel has stopped functioning

• first you need to check the power lamp suspension, or rather its circuit;
• Often, when a removable panel has a loose connection, it is necessary to check the corresponding connection connector;
• on transistors Q960 and Q961 there is a switch, the serviceability of which also needs to be checked;
• At the same time, you should make sure that there is an ILPW signal at the output of IC601.

No sound

Check algorithm if there is no sound in all playback modes:

• at the output of microcircuit 6, 20 the supply voltage should be 14 volts
• at output 4 and 22 UMZCH the supply voltage should be 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 through the signal to the control bus;
• if a signal passes through all of the above outputs, then the fault lies in the IC201 chip;
• It is also important not to forget to make sure that there is no voltage at output 22 of IC301, which is located on the MUTE formation circuit.

If there is no sound while playing a media file from a magnetic tape, you need to check the degree of its mobility, if any. 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 test step:

• connecting wires of Pioneer car radios are often subject to mechanical damage, so they must be checked with special care;
• If no defect is found in the connecting wires, 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 circuit 23;
• in rare cases, the cause may be the assembly of D202 diodes;
• The final stage of checking the serviceability of the AM tuner is to determine the presence or absence of a malfunction in the audio band filters CF51 and CF232.

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

Note. The main thing is not to forget that the essence of repair is to find the element that is in a faulty state and then replace it.

Information

Doesn't turn on

There are several reasons why the radio does not work. These include the following malfunctions:

• Fuse blown. This happens due to overloads caused by long-term operation of the device under high load conditions. Fixing this problem is not difficult. You need to remove the device and remove the fuse. The fault is detected using a multimeter. If the radio is connected through a mounting block, its fuses also need to be checked. If there is a breakdown, the parts are replaced.
• Violation of the integrity of the wires. If the radio in your car does not turn on, you need to inspect the cables for damage. Particular attention is paid to connecting the receiver to ground. Damaged wires are replaced and connections are made more reliable. The connector terminals are thoroughly cleaned of dirt and crimped.
• Incorrect connection. This problem can also cause the radio to not turn on. Repairs begin with an inspection of the wiring. The cables leading to the battery are looked for using a test lamp. The wiring has a two-wire structure. To properly connect the battery, the positive pole is connected to the yellow and red wires, the negative pole to the black wire. The blue cable is connected to the antenna and amplifier.
• Indoor module malfunction. When voltage drops in the on-board network, the microcircuits burn out, causing the device to stop working. Sometimes only sound is missing. If such a malfunction occurs, the receiver must be replaced. The functionality of the generator is checked at a car service center.

When you start the engine, the radio turns off: reasons

So, the owner gets into the car, turns on the instrument lights and radio, and then turns the key in the ignition. The starter begins to turn the engine, while the instrument lighting dims to a greater or lesser extent, and the power unit turns off and restarts until the engine itself starts operating.

As a rule, this happens if the engine is not yet warmed up. If you repeat launches in the future, but this time “hot” or after a slight preliminary warm-up of the engine, the radio will no longer turn off.

This voltage drop during startup is predictable. In this case, the main task remains to start the engine, and not to maintain the operation of other devices (heated mirrors and windows, headlights, radio, etc.). In other words, after turning the ignition key, all energy is sent to the starter.

If we talk about the radio, when the voltage in the on-board network drops, the power supply automatically turns off. This function is protective. The head unit itself contains a special program that restarts the car radio to protect it from freezing when the voltage drops.

However, it can be noted that this does not happen in all cases. For example, after the engine has been warmed up or the car has driven several kilometers after being idle, the radio does not restart when trying to restart the engine. Also, some power plants never turn off when starting the internal combustion engine, even if such a start is very difficult (the starter turns slowly, the dashboard dims, the headlights go out, but the music plays). Let's figure it out.

In practice, everything will depend on the battery charge level and the condition of the battery. For example, the battery is slightly discharged, and the car starts in the winter after being parked overnight. Under such conditions, the starter will naturally need to turn the engine longer, since the engine oil thickens in the engine under the influence of negative temperatures, the fuel pumps and evaporates less well, etc.

However, after the engine starts and runs for some time, the battery replenishes the lost charge thanks to the operation of the car generator. The oil in the engine also thins out, etc. This means that when restarted, it will be much easier for the starter to start the internal combustion engine, that is, there will no longer be a significant voltage drop. In this case, the protection of the car radio will no longer work, since the voltage simply will not drop to the minimum required by the manufacturer of the head unit.

Buttons don't work

1. Remove the front panel of the car radio, clean the contacts and return the device to its place. When installing, you need to make sure that the device fits tightly into place. There is a click when installed correctly.
2. Replace worn buttons and switches. It is difficult to do this yourself; you need to take the car radio to a workshop. Do not press the buttons too hard or twist the knobs after replacement. Careful operation of the device extends the service life of parts.

If the display on the radio does not work, you need to look for internal faults. The cable connecting the screen to the main modules is often disconnected. Only a specialist can fix the problem. You should not disassemble the device yourself, as this can make the situation worse. Due to the displacement of the cable, the operation of the sensor may be disrupted.

If the sensor on the radio does not work, you can use the remote control to perform the necessary operations. Incorrect installation of the panel may also cause the touchscreen or screen to malfunction. Testing the device in a service center will help you understand why the radio does not work.

Turns off during operation

If the radio turns off during use, the cause should be sought in the following faults:

• Disconnecting contacts in the power circuit. This happens when driving on uneven roads. If the radio suddenly stops working, you need to connect the power wires more securely. You need to find the pin closest to the audio device and clean it. A part of the wire with a terminal of a suitable size is connected to the negative terminal of the radio. The terminal is thrown onto the stud and securely fastened.
• The audio device is not properly secured to the dashboard. If the radio often turns off, you need to check it for this malfunction.
• Timer triggered. This part of the radio helps to avoid draining the car battery when the audio device is used for a long time. The car radio needs to be rebooted, this will help cope with the problem caused by the timer.

Other problems

Problems with reading storage media arise no less often than difficulties with turning on. You can eliminate them yourself.

This problem can be caused by several reasons, the most common of which are:

• No signal. In this case, the sound disappears or loses volume. Checking the high-level pulse supplied by the fourth pin of IC901 helps solve the problem. If there is no signal, the controller must be replaced. If the sound disappears when you start the engine and adjust the volume, you need to inspect the amplifier contacts.
• No voltage at the base. In this case, the sound fades or disappears completely when you try to increase the volume. This problem is determined by checking the bases with a voltmeter. If the tested parameter is zero, the transistors must be replaced.
• The Mute button is broken. The change in sound quality in this case is due to a controller malfunction. If you have problems with volume control, you need to check transistor Q802.
• Amplifier chips burn out. If there is no sound, you need to inspect all the cables connecting this module to the tape recorder. Repair involves replacing capacitors and microcircuits.

When using the car radio, the following problems with reading information may occur:

• Inability to recognize the disc. Occurs when the laser head is damaged due to vehicle shaking. Replacing this part helps solve the problem.
• Inability to read flash drive. First of all, you need to check whether there is a light indication on the drive. If it is present, the connector is working. After this, check whether the type of flash drive matches the parameters of the radio. Older audio devices may not read large storage devices. Problems also arise when the software is damaged. They can be solved by flashing the radio.
• Disc jam. Associated with a breakdown of the motor, pressure roller or sensors. It is recommended to replace parts.

The device is heating up

The radio overheats and turns off on its own if the power system is connected incorrectly. It is necessary to check the wire; it may have become loose or damaged. The cable needs to be completely replaced. The radio does not work in the car even if there is insufficient ventilation. This problem is typical for budget devices; it does not lead to significant malfunctions. If the system overheats frequently, you need to install a ventilation system.

Possible malfunctions and repairs

Doesn't turn on

To carry out high-quality equipment repairs, you need to establish the exact cause of the problem.

Are you a car driver?! Then you can take this simple test and find out. Go to test »

Procedure for inspecting the device:

No display backlight

Equipment repair includes:

• checking with a multimeter;
• replacement of a spare part.

If the buttons do not work, the causes of the problem may be the following:

• damage to the playing device cable;
• no contact, soldering failure;
• the fuse (resistor) is broken;
• contamination of the contact board.

Wires are damaged by vibration during driving, and breakages are common where the rigid fastener on the board is bent.

If a part fails, it is replaced.

Daisy chain connections made by the Chinese will last for six months. To increase the service life of the wiring, wrap it with tape and treat it with an emollient lubricant, which will prevent damage to radio components.

Distortion or lack of sound

If there is no sound in all playback modes or if you hear extraneous noise when listening to audio, inspect the equipment for defects according to the algorithm.

Determination of the audio signal IC201 at the output of the microcircuit (18, 19, 30 and 31).

If there is no signal, check its output parameters, determine how well the signal at the output of MK 25 and 27 corresponds to the standards.

Make sure that there is no voltage at the output of the generating circuit.

Check the connecting wires of the radio for defects.

Make sure there is sound in the microcircuits.

Often the device fails due to a defective AM tuner. It is recommended to check its components for functionality.

Doesn't read flash drive

There are often situations when the equipment does not read the flash drive after the car engine is started. It also happens that the device does not see the flash drive.

1. I am not familiar with the format in which the audio files were recorded. Format the drive.
2. Wires and cables have become unusable. It happens that during the operation of the car, the fastening screws become loose and the structure becomes warped.

If a visual inspection reveals nothing, it makes sense to contact a service center for help.

To repair the radio, you need to find out the cause of the malfunction.

The device must be inspected in the following order:

• check the supply voltage, it should be within 12-14 V;
• make sure that the throttle and fuse L951 are working properly;
• make sure that the diodes performing the protective function comply with groups D951 and D952;
• measure the voltage of the Q952 stabilizer, which should be 5 V;
• inspect sensors Q601 and Q602: if they do not work, the radio cannot play music;
• make sure that the supply voltage at output 68 of MKIC601 is 5 V;
• check if there is a switch on transistor Q609;
• see if 2 quartz oscillators MK and KK work well.

If you do not find a problem, check the pulse contained in the digital bus, which is located in the space between the removable panel and the MK generator. If there is no power, the microcontroller IC601 or IC901 must be replaced.

ᐈ Car Radio Repair Pioneer (Pioneer) Kyiv - Prices 2022

The All-Ukrainian TV channel in the program “Breakfast with 1+1” interviewed Roman Kirigetov, the founder of the Kabanchik.ua project, live about how the service works and how to safely order the services of private specialists in Ukraine.

Car owners sometimes have to have their car radios repaired by a professional technician - despite its reliability, the equipment still breaks down. Frequent use, clogging, constant exposure to vibration are the main factors influencing the occurrence of malfunctions. The intervention of an experienced specialist can solve almost any problem and extend the operation of the equipment for a very long period.

Basic malfunctions and repairs of car radios

Most often, technicians have to repair radios that are part of the car's equipment. Over time, and also in the absence of preventive maintenance, they fail. Regardless of the radio model, typical malfunctions usually look like this:

1. The radio does not turn on . The main reason is lack of food. If this suspicion is not confirmed, professional diagnostics are necessary to determine the source of the breakdown. Afterwards it will become clear what type of repair needs to be performed.
2. No backlight . To repair the car radio in such a situation, it is enough to replace the light bulb or LED behind the control panel. There may also be problems with the power circuit. The work is very simple, and the master will cope with it in a few minutes.
3. Poor disk reading . At the same time, warning messages may be displayed on the device display. There are many reasons for this phenomenon: it could be a malfunction of the laser head, problems with the motor, or the main control board. The quality of the disc also plays a big role. The types of repairs depend on the factors that caused the problem.
4. When shaking, disc reading gets lost . Most likely, the reason is a breakdown of the shock absorber of the laser head or radio. Complex repairs are required, which can only be carried out in an equipped workshop.
5. Code required . Repair of standard car radios in this case is aimed at eliminating the consequences of resetting the equipment to factory settings. First of all, you need to enter the equipment code to gain access to it and make further settings.

Who can I order car radio repairs from?

Most often, technicians repair Pioneer car radios - not because the equipment of this brand is unreliable - it’s just that models of this brand are recognized as the most popular. What services do experienced repairmen provide? Standard list:

• detailed diagnostics;
• setting;
• help with connection;
• replacement of parts.

Prices for radio repair Price, UAH.

*Price current as of September 2020

Do you need high-quality repair of car radios in Kyiv with high speed, guaranteed results at affordable prices? The Kabanchik service will help you find a master with a proven reputation, ready to work on your terms: in particular, you yourself can determine the price and timing of the repair. You can choose a performer based on reviews, portfolio and rating.

Frequently asked questions about Pioneer car radio repair (Pioneer)

How to order specialist services?

No display backlight

If there is no screen lighting, you need to check the supply voltage +5V, +14V on the second pin of the CN701 connector. It must enter the collector circuit of the output transistors. If there is no +14V voltage, the zener diode or one of the transistors may not be performing its functions.

Repairing a Pioneer radio consists of checking with a multimeter and replacing the damaged part if necessary.

Buttons don't work

The main reasons why car radio buttons may not work:

• The player cable is damaged.
• There is no contact, the soldering is broken.
• The fuse or resistor is broken.
• The connection points of the buttons and the contact board are dirty.

A connecting cable is an elastic cable in the form of a tape that combines many wires. It links all parts of the radio to ensure their continuous operation. Such wires can be damaged by vehicle vibration; they often break at the bend points of the rigid attachment to the board. If it breaks, it must be replaced. Daisy chain connections made in China last 3-5 months. To extend the life of the wire, wrap it with tape and soften it with a special lubricant that does not damage radio components.

The burnt resistor must be removed, then a new part must be installed by soldering.

Fuses ensure trouble-free operation of vehicle equipment.

They can burn out due to voltage surges in the network.

Damaged fuses can be detected using a phase indicator. After this, they must be replaced with new ones.

You can detect a fuse that has blown as a result of voltage surges using the same phase indicator.

If the contact board is dirty or you accidentally spilled liquid on the instrument panel, there is no need to repair the Pioneer car radio. It will be enough to remove the panel and wipe the board and button contacts with a cotton swab moistened with alcohol or cleaning fluid.

When you try to insert a disc or read audio from a flash drive, does error 23 appear on your Pioneer radio? We consider the most common causes and solutions to this error.

Victory over turning off the radio when starting the engine.

If on Sony I was still not very annoyed by turning off the radio when starting the engine, then on the Pioneer MVH-x580bt it was already annoying. Firstly, I was tired of turning off the music when starting the engine, and secondly, the Bluetooth connection dropped, the phone did not always connect correctly. Replacing the wires with thicker ones did not help - the battery is not new, the discharge current has decreased. Something had to be done. Since after the tweak I said goodbye to the warranty, I decided to upgrade the radio further. There is no manual for 580 anywhere on the Internet yet, so I downloaded it for 560 - they are similar in the power circuit. Here is a diagram of what was done

Elements used: Schottky diodes NTSJ20120CTG (20A) and SB180 (1A), capacitor 22000uf 25v (panasonic) and 470uf 25v. And so, when we start the car, at the moment the starter starts, the largest voltage drop in the on-board network occurs - because of this, the radio turns off. To prevent the radio from turning off, we use Schottky diodes and capacitors. The main DC voltage (yellow wire of the radio) passes through the NTSJ20120CTG diode (20A) and constantly charges the 22000uf capacitor. When the ACC ignition is turned on (red wire of the radio), voltage flows through the SB180 diode (1A) and charges the 470uf capacitor. When the starter starts, the voltage of the entire network drops significantly for a split second (we noticed how the headlights go out when we start). It is at this moment that the diodes do their job - they do not allow the voltage that has accumulated on the capacitors to return to the network and all the accumulated voltage goes only to the radio. A 470uf capacitor on the ACC is enough for the radio to work for 5 seconds when the ignition is turned off, that is, the radio will work for another 5 seconds when the power is turned off on the ACC. But if you add another diode as in the following diagram (indicated in green), then when the ACC is turned off, the radio will work until it is turned off by pressing the button. It will then be possible to turn it on only when the ACC power is turned on again (not yet implemented).

In general, I decided to do all this. I soldered two wires to the connector in the radio:

Source

A practical look at the general structure and functioning of a pioneer car radio

Pioneer car radio repair

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

Read more: How to find out the parameters of a car's disk

No sound or strong background

If the sound disappears or noise is heard instead of the melody in all playback modes, you need to inspect the device for damage in the following order:

• at the outputs of microcircuits 6 and 20 the voltage should be 14 V, and 4 and 22 UMZCH - 5 V;
• determine the audio signal IC201 at the outputs of chips 18, 19, 30 and 31;
• if there is no signal, check it at the input of IC201, and also determine whether the signal at the output of MK 25 and 27 is suitable for the control bus;
• when the audio signal is present on the listed outputs, the IC201 chip is damaged;
• make sure that there is no voltage at output 22 of IC301, which is located on the MUTE formation circuit;
• check the connecting wires of the car radio for mechanical damage;
• Make sure that the audio signal is present on IC251 and IC201.

Sometimes the car radio may not work due to malfunctions in the AM tuner. Check out its components, including:

• URCH elements Q201 and Q202;
• LOCL signal on tuner circuit 23;
• diodes D202;
• audio band filters CF51 and CF232.

A description of the disturbance in the sound of melodies will help narrow down the search area for damage in the system:

• If the sound disappears when starting the engine or after increasing the volume of the tone, it means that the Stand-By signal is missing. Check the +4.8V pulse on pin 4 of IC901. When there is no pulse, you need to change the controller. It will also be useful to examine the strength of the power amplifier contacts.
• When the device heats up and hisses as the sound volume increases, you need to monitor the voltage in the base circuit of the output transistors. It should be different from 0. If there is no voltage, then the transistors are faulty. Noise may also appear due to malfunctions in the controller, transistor Q802, or mute button.

You can repair the sound processor by replacing the found damaged element.

Procedure if the pioneer car radio does not turn on

• first you need to make sure that the supply voltage is within 12-14 V;
• Next, you need to make sure that the fuse and throttle are in good condition - L951;
• diodes D951 and D952 perform a protective function, so you should also make sure that they are functioning properly;
• the voltage of the Q952 stabilizer must be equal to 5 V, otherwise the device is faulty;
• sensors Q601 and Q602 may suddenly stop functioning and, as a result, the entire car radio will also stop working;
• at output 68 MKIC601 the supply voltage should be equal to 5 volts, and a logic 1 signal should always be present at the same output;
• there is a switch located on transistor Q609, the serviceability of which also needs to 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 stopping turning on, it is imperative to follow the sequence presented above.

What needs to be done if the causes of the malfunction cannot be found:

• the first thing that needs to be done is to check the pulse contained in the control digital bus;
• the digital control bus is located in the spatial gap between the removable panel and the MK;
• if there is no pulse, then the cause of the malfunction lies in the microcontroller IC601 or IC901.

The suspension on the removable panel has stopped functioning

• first you need to check the power lamp suspension, or rather its circuit;
• Often, when a removable panel has a loose connection, it is necessary to check the corresponding connection connector;
• on transistors Q960 and Q961 there is a switch, the serviceability of which also needs to be checked;
• At the same time, you should make sure that there is an ILPW signal at the output of IC601.

No sound

Check algorithm if there is no sound in all playback modes:

• at the output of microcircuit 6, 20 the supply voltage should be 14 volts
• at output 4 and 22 UMZCH the supply voltage should be 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 through the signal to the control bus;
• if a signal passes through all of the above outputs, then the fault lies in the IC201 chip;
• It is also important not to forget to make sure that there is no voltage at output 22 of IC301, which is located on the MUTE formation circuit.

If there is no sound while playing a media file from a magnetic tape, you need to check the degree of its mobility, if any. 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 test step:

• connecting wires of Pioneer car radios are often subject to mechanical damage, so they must be checked with special care;
• If no defect is found in the connecting wires, then it is necessary to check the passage of the audio signal on the IC251 and IC201 microcircuits.

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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 circuit 23;
• in rare cases, the cause may be the assembly of D202 diodes;
• The final stage of checking the serviceability of the AM tuner is to determine the presence or absence of a malfunction in the audio band filters CF51 and CF232.

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

Note. The main thing is not to forget that the essence of repair is to find the element that is in a faulty state and then replace it.

The instructions for repairing a pioneer car radio with your own hands are simple, however, they contain a huge number of nuances. To carry out repairs in practice, the use of photo and video materials is a prerequisite. The price of a self-replacement is significantly lower than that of a car service, since in practice the car service will not look for a fault in the car radio; instead, it will be completely replaced, which will certainly not cost a penny.

Anyone who spends a lot of time behind the wheel knows that a car radio is a very important part in a car. Any trip is more enjoyable accompanied by your favorite music. Currently, there are many models of car radios to suit every taste and budget. They are equipped with various functions and can satisfy any motorist.

Regardless of its cost, a car radio, like any other complex electronic device, can sometimes fail. It often happens that the car radio simply stops turning on, or turns on and immediately turns off. There may be several reasons for this malfunction.

Why doesn't my car radio turn on?

Main causes of malfunction:

• The fuse in the car unit responsible for the operation of the radio has burned out. To solve the problem you just need to replace it. We must not forget that a blown fuse cannot always be identified only by appearance. It is better to ring all the fuses using a special device - a multimeter.
• The fuse on the radio itself has blown. In order to replace it you will have to remove the radio. How to do it Check the wiring

to do it correctly depends on the car model and the receiver itself. The fuse is usually located on the back of the device and is blue in color.

• The problem is with the car's wiring. To fix the problem, it is better to contact an auto electrician. It is advisable to do this immediately after a malfunction occurs, since problems with the vehicle's wiring can have very serious consequences.
• There is a malfunction in the radio. This could be a faulty board or radio relay. To diagnose and fix the problem, you need to dismantle the receiver and take it to a service center. Competent specialists will be able to re-solder the radio board. If the malfunction is serious, repairs may have a high cost, comparable to the price of a new radio.

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Why does the radio turn on and off:

Why does the radio turn on by itself?

When installing any electrical equipment, including a radio, in a car yourself, you need to be very careful. Before installation, you must carefully study the instructions. Be sure to follow safety precautions while working. If installed incorrectly, not only may the radio malfunction, but also more serious problems associated with the vehicle's electrical system.

What to do if the phone does not respond to buttons?

Note. When searching for the cause of the malfunction that led to the pioneer car radio stopping turning on, it is imperative to follow the sequence presented above.

What needs to be done if the causes of the malfunction cannot be found:

Why doesn't my car radio turn on?

Main causes of malfunction:

to do it correctly depends on the car model and the receiver itself. The fuse is usually located on the back of the device and is blue in color.

Doesn't read flash drive

It often happens that the radio does not see a flash drive or CD after starting the car engine. Sometimes the disc gets stuck in the drive or the melody plays intermittently.

Such problems can be caused by the following reasons:

• The device is not capable of playing recordings in the format in which the music is saved. In this case, use a different type of record.
• If the disc is not detected or the melody is played intermittently, most likely there is dust on the optical lens. Remove foreign particles with a napkin or other available item.
• Another possible reason is the lack of voltage on the laser. Try installing it yourself.
• A faulty daisy chain connection or wiring also results in the radio not recognizing the flash drive. You need to find the damaged wire and replace it with a new one.
• The device may become warped due to loose internal mounting screws. If you tighten them, the problem will disappear.

Please remember that if repaired improperly, your Pioneer radio may become unsuitable for further use. If difficulties arise, it is better to have the radio repaired at a service center.

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Let's sum it up

As you can see, if the radio turns off when starting the engine, then this can serve as a kind of additional indicator of the condition of the battery, as well as the quality of its charge from the car’s generator, the serviceability of the main unit itself and its connection, etc.

As a summary, we note that some devices (especially budget versions from the lower price segment) may not have any protection at all. It turns out that such power units do not react in any way to starting the engine, but this does not mean that a voltage drop in the vehicle’s on-board network does not occur.

How does the engine start button work? Available options and solutions for installing the starter button yourself. How to install the engine start button yourself.

The starter clicks and/or buzzes, but the engine does not turn over. The main causes of starter failures, diagnosing and troubleshooting them yourself.

Reasons for the smell of gasoline in the car interior, when starting the engine in the engine compartment, etc. What to do if your car smells of gasoline.

Why does the starter turn normally, but the engine does not catch and does not start? Main causes of malfunction, checking fuel supply and ignition systems. Adviсe.

How to remove the engine start lock. Checking for random activation of the immobilizer and how to disable it. Diagnosis of possible alarm malfunctions.

How to determine why the fuel pump does not pump or works poorly. Fuel rail pressure, pump diagnostics. Wiring, relays, fuel pump fuses.

Source

Speaker wheezing when the radio is running: why does it happen and what to do?

Owners of car radios of this brand also encounter this problem quite often. In many situations, this problem can be caused by problems in the speakers themselves. However, the radio tape recorder wheezes more often for the following reasons:

• Incorrect radio setting;
• Having problems with capacitors;
• Poor connection of wires and contacts.

In the first situation, the only way to eliminate the violation is to reconfigure the sound balance. The owner of an audio system must, first of all, make sure that the sound is evenly distributed between the speakers. In addition, check in the settings that there are no values ​​set for excessively low frequencies. Wheezing in speakers can also occur due to capacitors. In such a situation, you just need to check them. It is also worth doing if there are faults with the contacts. It is important to ensure that they are insulated and securely fastened. More details about where to look for a problem in PIONEER brand radios will be discussed in this video:

For those whose radio goes out when starting the engine!

Hi all! I found on my computer the outline of a small but useful topic that I wanted to share with you. We will talk about a small cheating way to defeat the radio going out when starting the engine. This problem arises due to the fact that the starter stands still during the first moment of starting, and its consumption at this moment is almost equal to a short circuit of the battery. After the starter breaks down, consumption drops sharply, draining the battery. If your battery is low or does not play with its biceps like a combat AGM, then at that very moment the battery voltage drops below 11.5V and the radio turns off due to lack of power. Well, and accordingly it starts again immediately. The problem is generally not critical, but quite annoying. It was for this occasion that people came up with this idea.

The essence of the idea is that the radio and capacitor are powered through a diode. The capacitor holds some charge within itself. At the moment of voltage drop, the radio is powered from the capacitor and the diode prevents the outflow of charge from the capacitor into the car's electrical system, which is starving at this moment in the same way. Then the voltage is restored, the condenser is instantly charged and everyone is happy. The mafon does not go out.

I would advise taking the larger the capacity, the better. From 2200 microfarads and above. The larger the capacity, the longer the mafon will survive the drawdown) and the voltage is not lower than 16V! It is very important. if the voltage of the condenser is less than what is supplied to it, then the condenser explodes after a few minutes, cheerfully taking away everything with it. I saw it myself in my youth))))