I have 3 of these desks MX3242X and they are generally very good but all of them have some faulty channels some more than others. It seems to be something to do with the channel gain control, not the faders. The fault doesn't happen in groups of channels eg 1,2,3 + 4, it appears completely random. Any ideas or maybe where I can get a service manual so I can try and trace the fault.
Behringer are pretty good at supplying schematics and information in PDF form. Have you approached the distributor in your country. They are pretty good at supplying info, and dont usually charge. Just rather see the product sorted out. Email a few and see how you go :)
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Turn off the other channel and listen only to the bad channel playing some music. Turn it up! If you hear any music the pre-amp is working and the power amp is faulty. If you don't, then the pre-amp is faulty. Because it's a stereo amp you have the good channel to compare with the bad. So you can do voltage tests, or "buzz" tests. Buzz Tests or where you apply a insulated tool to the circuits, a buzz will be heard. If it buzzers in the good channel it should in the bad. Ignore the power supply and don't short any parts out!
The thing with stereo amps is that they are actually two mono channels put together, so if one side goes you have the other side to tell you what the other side should be doing. So you can compare the good channel with the bad. For example taking voltage readings. Also you can buzz test it. Generally you can touch with an insulated tool parts of the amp to produce a buzz. So if it buzzers in the good channel it should buzz in the bad. When it doesn't you have found the bad part!
Without a schematic you can still trace the circuit to locate the fault.
Put a music source or sound source into the bad channel and a good channel, and with an oscilloscope or with a pair of high impedance headphones with test leads on the ends- you can set up a low z headphone with an impedance match trasformer, make sure you have test prod ends on one of the leads. The other can go to a chassis ground. Start at the input and work your way forward comparing the signal between the good channel and the faulty channel. When you lose the signal or you encounter severe distortion, you are in the vicinity of the defective part.
Common failures are a Deffective 4558 or TL072/TL071/TL074 IC chip. You may have a faulty electrolytic capacitor, or even a faulty bypass caoacitor in general. Bad solder connections, even a broken fim resistor.
With the IC chips, the usual power pins for an 8 pin plastic or ceamic DIP are pins 4 and 8. usual outputs for the 8 pin are 1 and 7 the remaining pins are the inverting and noninverting inputs. 2 and 3 and 5 and 6.
Also check switches and especially those with interupts on the input and output jacks- they can get dirty.
Yes speakers can be repaired... you need to find if it is the woofer or tweeter or both of them.... DO check that it is not the amp channel by swapping sides. Unless you connected too large an amp it should not have damaged the speaker... First isolate if it is the highs or lows that is fuzzy... also check that some debis has not been knocked loose... grilles are notorious and labels for vibrating.
The thing to remember with turntables is that if you touch the audio imput of where the deck connects and it doesn't buzz then there's something up with the amp. If it does buzz, then remove the leads to the cartridge and touch them one at a time with your finger. One should buzz in one channel and the other in the other channel. The two other wires are earths and generally don't buzz.
If you get the two channels to buzz the cartridge is faulty. If they don't then inside the deck is a fault (perhaps an internal pre-amp has failed).
replace the cord or you may have a faulty nic card. this seems to happen to me quite a bit since I am in the IT industry. If your nic is "onboard" the mainboard, they are prone to fail or stall out without warning or reason.
Here is a good test. Unplug the computer (yes phsically unplug it, then press and hold power button for 10 seconds. This discharges all the capacitors on the mainboard, which seems to fix alot of problems I come across with hardware, especially nic cards or onboard nics.
Now turn it back on. You could be jacked in to a faulty port on whatever the other end is plugging into as well. It's hard to tell with the limited info you posted.
I have a new pair of 5500. It seems not working, but I discover that using channel 1 in one and channel 2 in the other they work, the same if using channel 2 in one I have to select 3 in the other, it is like a frecuency error. Maybe is the same with yours.