Powerful sound is not complete without a subwoofer. But heavy loads can cause it to malfunction. There can be many reasons, but only a few solutions. But everyone can fix it, if you know what and in what sequence you need to do it.
Necessary
Tester, screwdriver, flashlight, circuit, soldering iron
Instructions
Step 1
Visually inspect the subwoofer. If the speakers connected to it do not work, check the connection cables for breaks. Check the connections between the subwoofer and speakers. If there is no power, check the cable. With the help of a tester, ring all the wires, so you will be sure that they are intact.
Step 2
Disassemble the case. To do this, disconnect the subwoofer from the mains and speakers. Using a screwdriver, remove the screws at the back of the case. Carefully remove the microcircuit plate. If the plate does not go, do not pull, you may break the connecting wires. Shine a flashlight and find the cause.
Step 3
Carefully inspect the microcircuit for burnt elements. Also look at the tracks, maybe something is short-circuited. Be sure to do this in good lighting.
Step 4
Check fuses. They stand in front of the transformer. If they are burnt, just replace. If the problem persists and they are on again, check the voltage in the network.
Step 5
Check if power is supplied to the microcircuit. To do this, disconnect the transformer from the load (microcircuit) and connect an equivalent - a light bulb, for example. If there is no power supply or it is not of the same rating as is needed for the normal operation of the microcircuit, it is faulty.
Step 6
Check the output voltage of the microcircuit. So you can understand if there is a signal at the output, and what it is. Based on this, the subsequent repair of the microcircuit will be concluded. This is the ringing of diodes, resistors, etc. If necessary, some elements will need to be removed with a soldering iron for ringing. But do not forget, too much temperature can damage them, as well as the microcircuit itself. If you find a faulty element, then replace it and measure the output signal, if the cause is not eliminated, continue to look for the malfunction further.
Step 7
Attach the microcircuit to the case and assemble the subwoofer.
