Almost no car is complete without installing a modern and powerful radio tape recorder. It often happens that there are malfunctions in the radio tape recorder, for example, when reading discs, or settings are lost when playing sound. To understand the nature of the breakdown, you need to remove and repair the radio tape recorder. You can do it yourself or take the radio to a car repair shop.
Necessary
set of tools
Instructions
Step 1
Stop the car engine. Dismantle the radio if you want to do the repair yourself. Take it out of the special casing and disconnect all wires. Since the radio tape recorder is mainly located on the front of the panel, as a result of the ventilation and heating systems, a large amount of dust gets into the radio tape recorder, which leads to overheating and failure of electronic elements and premature wear of the mechanical parts of the device.
Step 2
Open the metal cover of the radio from the PCB side. Inspect and check the PCB for charred tracks, burnt parts, or leaks. If you find a burnt track, restore it.
Step 3
Check the functionality of the radio components, open the top metal cover and unscrew the four fixing bolts that secure the CD / MP3 deck. Take out the disk deck, do not forget to unfasten the two cables that are connected to the main board. Usually, all cables and connectors are detached quite easily, without requiring additional tools.
Step 4
Find the protection diode on the board, which is usually located near the power supply circuits and the main connector. Unsolder this diode and check its resistance in forward and reverse connection. The diode has one-sided conductivity. Since it is protected by the filter choke, remove the choke first and then the protective diode.
Step 5
Check the protective diode. Swap the media probes. In the event that the multimeter shows zero resistance, this means that the diode is broken. Look at the brand of the diode and replace it with a similar one.
Step 6
Before soldering a new diode, check it for operability. In principle, the radio tape recorder will work even without a diode, but if an unforeseen "emergency" happens, the amplifier microcircuits and other important radio tape recorder systems may suffer.
Step 7
Check the serviceability of the wiring and devices of the on-board network of the machine before connecting the car radio.
