Some novice radio amateurs are not eager to take on the repair of rather complex electronic devices, such as CD or MP3 players, computers or stereos. In fact, most of the malfunctions of the same music center are easy enough to fix, with minimal knowledge in the field of electronics and little experience in handling equipment.
Necessary
- - soldering iron;
- - solder;
- - flux;
- - headphones;
- - working speaker.
Instructions
Step 1
Determine what kind of malfunction you need to fix. It is quite difficult to cover all the problems of music centers. Most often you have to deal with the absence of sound or violation of its parameters (timbre, signal amplification, frequency characteristics).
Step 2
Start your search for the cause of the sound problem by checking the speakers (s). Connect another speaker (speaker) with an impedance of 4-8 Ohm for testing. You can use a working speaker from an old TV or tape recorder. Typically, the load resistance value is indicated on the back of the device, next to the corresponding connector.
Step 3
If, after connecting a working speaker, sound appears or its quality is restored, the fault should be looked for in the speakers. Otherwise, you have to look in the internal circuits of the music center.
Step 4
If wheezing is heard during playback, and the sound appears and disappears, look for the cause of the malfunction in the violation of the connection of the input connector and contact copper tracks on the main board of the playing device. Restore the soldering in places where it is broken.
Step 5
Check the operation of the music center in all modes: in receiver mode, cassette deck, MP3-player. If sound disturbance occurs in all three cases, the failure is most likely associated with the amplification output path, namely the audio power amplifier. To finally make sure of this, connect the headphones to the “Phone” jack, remembering to turn down the volume. Lack of sound in this case indicates the failure of the specified amplifier. Replace the amplifier IC with a good one.
Step 6
Even if the described actions allowed to eliminate the malfunction, inspect the printed circuit board to identify poorly soldered places, "swelling" of electrolytic capacitors, darkened tracks and other defective wiring elements. Replace the identified faulty elements. Such prophylaxis will prevent larger malfunctions during the further operation of the music center.
