Powerful sound goes hand in hand with the use of a subwoofer. However, under the influence of too heavy loads, it can fail. You will be able to repair a “flying” subwoofer if you clearly know what actions and in what sequence you need to perform.
Necessary
- - tester;
- - soldering iron;
- - device diagram;
- - screwdriver;
- - torch.
Instructions
Step 1
Inspect the defective subwoofer. If the speakers that are connected to it refuse to work, check the connecting wires for breaks. Inspect the contacts at the connections between the speakers and the subwoofer. If there is no power, check the cable that connects the subwoofer to the mains. Call the wires with a tester to make sure they are intact.
Step 2
If no faults are found, disassemble the subwoofer case. Disconnect the device first from the speakers and from the mains. Use a screwdriver to unscrew the screws on the back of the housing. Carefully remove the microcircuit plate. If it does not give in, you do not need to pull - cut off the connecting wires. Shine a flashlight to identify the cause of the chip jam.
Step 3
Carefully inspect the microcircuit for burnt-out elements and broken tracks. The lighting must be good, otherwise you will have to overextend your vision trying to inspect the microcircuit.
Step 4
Next, check the fuses in front of the transformer. If they are burnt out, replace them with new ones. If the new fuses also blow out after a short time using the subwoofer, check the mains voltage.
Step 5
Check if there is power to the microcircuit. To do this, it is necessary to disconnect the transformer from the load and connect an equivalent. It could be a regular light bulb. If the light is off, it means that there is no power supply or it has a wrong rating, which is necessary for the proper functioning of the microcircuit. This means that the transformer is faulty and needs to be replaced.
Step 6
Check the output voltage of the microcircuit to understand if there is a signal at the output and, if so, what it is. The further process of repairing the microcircuit depends on this - ringing of diodes, resistors and other things. If necessary, solder some elements to ring. However, remember that too high temperature can damage not only the evaporated elements, but also the microcircuit.
Step 7
Having found the faulty element, replace it with a new one and measure the output signal. If the problem persists, continue troubleshooting.
Step 8
At the end of the repair process, fix the microcircuit in the case and assemble the subwoofer.
