DIY mixing console repair

In detail: do-it-yourself mixing console repair from a real master for the site my.housecope.com.

Repair of mixing consoles and its cost depends on the type of the device itself, the complexity of the failed unit or element and the quality of the new spare part. The remote control itself is an electronic device that is designed to mix different numbers of sound signals. At the same time, they can be summed up into one or several separate audio tracks, and are used in the areas of sound recording, playback, as well as television and radio broadcasting.

The main difference between this equipment, for connecting several audio channels into one, is on the basis of which radio components and on what principle the mixer works. They are divided into:

  • Analog, when the sound signal is an electrical impulse of one size or another;
  • Digital. The sound is converted to a digital signal, so it is less prone to distortion and interference.

The following difference is expressed in the number of inputs and outputs, for example, modern professional mixing consoles used in concerts and in recording studios consist of:

  • from 32 entrances;
  • at least 6 Aux-buses;
  • wide-band equalizer, consisting of several dozen precise and sensitive faders;

A fader is a modern analogue of a conventional slide resistor, by the way, this element is almost the main control element of a mixing console. Some are equipped with miniature motors that drive a fader knob to give the plant operator a visualization of the signal level. Every second repair of mixing consoles is reduced to replacing one or more of these elements to restore the full functionality of the device. But this does not mean that the owners of compact and budget mixers with a small number of processed channels and potentiometers of a simple design, instead of fades, fail less often. The likelihood of a malfunction depends on the mode of operation and the manufacturer of this device, each part included in its composition and the humidity in which the device operates.

Video (click to play).

There is a separate class of mixing consoles in the world of music that can be used in the work of a DJ. They consist of fewer channels, but are equipped with:

  • a special device for smooth mixing of input signals - a crossfader;
  • a block that creates special sound effects that a DJ cannot do without.

Knowing how the mixer works and what it consists of, the repairman of this equipment plans to search for a malfunction. They have input and output sections of audio signals: mono and stereo and a multiple of the input channels.

The main elements of the inlet section:

  1. Preamplifier. It is equipped with precise sensitivity adjustment, which allows you to set the desired operating level of the input signal;
  2. The constant current source required for condenser microphones to operate is called phantom power;
  3. Equalizer, consisting of many bands, their number makes it possible to more carefully and accurately adjust the frequency response of the incoming signal;
  4. Routing unit for processing by the built-in or external processor of sound effects, as well as sending a signal to a separate observation line and a visual picture;
  5. Pan control that forms the sound picture;
  6. Volume control or fader for each of the input channels separately.

And these are the constituent elements of only the input section of the signals, in turn, the output is a control system, as well as the redirection of signals received from the input section.

Among the most common problems with all types of mixers, there are three main ones:

  1. Malfunctioning knobs, potentiometers or faders. This is expressed in the breakage or disappearance of the signal during the movement or movement of the handle;
  2. Power supply malfunctions. They are mainly related to the power supply system and its stabilization. Some mixers are equipped with built-in effective stabilizing devices that allow operation even with deviations from the mains voltage of + -50 Volts.
  3. Connector problems. They appear from frequent and careless use, connection of low-quality cords and connectors with different dimensions.

Based on the foregoing, it can be seen that the repair of mixing consoles is a special type of work that only professionals can perform.

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Namesake, will this help me from the link?

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Yes. If the conductive layer of the fader is not worn out to the point of holes, but rather heavily soiled, i.e. there are crackles and signal interruptions when it is moved, flushing with this Contact will help. The same is the case with sticky, crunchy, popping signal routing buttons. It is important before using this tool to blow out the remote control with a vacuum cleaner to remove accumulated dust, then, following the instructions for Contact, spray the agent through the standard sprayer as close as possible to the working gap of the fader (potentiometer), push-button contact, etc. After the agent is introduced, the treated regulator it should be smoothly worked several times (15-20) along the entire length of the working stroke. Connect to the network no earlier than 3-4 hours after spray treatment. The product must not be used to treat energized equipment.
In some cases, due to its high penetrating power, it even helps with sealed potentiometers. The effect is given even when processing vintage, fairly neglected equipment.

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And it also very well helps with the "clogging" of the contact surfaces of the on-board electrical equipment of cars. Relays, ignition locks, starters, etc.

They brought a power supply unit, or rather, even with a mixing console, the problem is that there is a sharp background in all channels of the console. I connected the power supply, listened - really phonit! I started with the power supply, it is made in a sturdy case with a protective ventilation system, with beautiful stickers - we open it and see that everything is not so expensive inside, the board darkened in order, overheating on the face, we check the capacitors on the output - here there is a bipolar 15 volt for shoulder, but with a little current on the load. So, after checking the output capacitors, there were several that had an increased ESR value, and the voltage drop was above normal, the capacitance was slightly less than the specified value, there were no such capacitors, therefore, I put 1,000 microfarads instead of 470 microfarads. I thought that this would solve the problem and filtering would get better, but the problem was only partially gone.

I looked and looked at the printed circuit board, and could not understand: what else is wrong here.I decided to solder well, since there were many types of rings from prolonged overheating, so I soldered, but even then the problem did not dare, then I decided to wash the board - I took an expensive degreaser and began to wash it all over the board, and noticed that under the network capacitor in the filter on the hot part of the block some kind of dirt flowed, poked it in the side with a screwdriver and it became clear that it was urgent to solder it - I took it off and saw that one of the conclusions had simply been driven off by time and leaking electrolyte, and thus there was practically no capacity after the rectifier at the unit!

After looking for a similar one, I did not find it and put the capacity at 10 microfarads 400 V, connected it - the problem was solved - a crystal sound and no noise and backgrounds, the device worked as it should. The disadvantages of the power supply are that when disassembling, in order to remove the board, you have to unsolder the three-pin connector to the power cord, and with a careless movement you can break off a part of the case. It is already easier to assemble, sealing and assembly is much easier when you already understand what and where it is worth. As a result, everything works - both the power supply unit and, of course, the mixing console.

Image - DIY mixing console repair

Buying a good mixer is expensive. So I thought I might assemble it myself. There is not a lot of hem in the net, and there is no suitable one.
Throw here the diagrams of the mixers, and who did it yourself, please describe what pitfalls you encountered.
Thanks in advance.

I would like something with 2-3-microphone inputs 4-5-line

  • Image - DIY mixing console repair
  • Image - DIY mixing console repair
  • Image - DIY mixing console repair

Image - DIY mixing console repair

Image - DIY mixing console repair

  • Image - DIY mixing console repair

Image - DIY mixing console repair

Nazarett, yes, but not with a timbre block.

Diamontius, I'll take note of a good scheme.
What transistors did you use?

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What transistors did you use?
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In the microphone part, it is desirable to be quieter (less noise) and the corresponding KU (100-500 is enough). In terms of the adder, they are similar, but the KU can be smaller, in my case C3198 in the adder, KT3102 in the microphone preamp. Resistors "Balance" are better to take less - 3K-10K.

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Do you need TB for each channel?

Then it is easier to use op-amps quadruple or double

Image - DIY mixing console repair

Image - DIY mixing console repair

Image - DIY mixing console repair

Image - DIY mixing console repair

Well, actually. If you have any questions, please contact us!

I saw the jamb as soon as I laid it out) remember in places the nests, from the bottom of the HLR on top of the jack, just the inputs, without strapping, well, or the resistances R1 and R65, change places, everything else is normal

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Image - DIY mixing console repair

Image - DIY mixing console repair

Diamontius (28 January 2014 - 16:47) wrote:

Image - DIY mixing console repair

Image - DIY mixing console repair

Image - DIY mixing console repair

  • Image - DIY mixing console repair
  • Image - DIY mixing console repair

Image - DIY mixing console repair

Image - DIY mixing console repair

Image - DIY mixing console repair

Image - DIY mixing console repair

Image - DIY mixing console repair

Image - DIY mixing console repair

I would like to offer you a preamp circuit for a mixer that is very easy to manufacture with a minimum of parts and does not actually need to be set up before launch. The repeatability is literally 100%. Moreover, this preamplifier is both conventional and balanced; and, if desired, if a potential of +48 volts is applied to the inputs, then it is also phantom! Meet:
Image - DIY mixing console repair