Question about Behringer Pmp3000 16 Channel Audio Mixer

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Got plaster dust in the board. my service guy can't get the case apart. don't suggest sending to berringer. aint gonna happen.

Thats all . he took out every screw he could find and it won't come apart

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If it were me I would find a service guy who can actually get in to the unit! But while I'm looking I would turn it upside down, and while tapping it or vibrating it with something go over the whole board with a vacuum cleaner. After about 10 minutes of this turn it back over, brush excess dust off with soft brush or air duster, and then douse it thoroughly in electronic switch cleaner and lubricant - leave to dry. But try find a local professional to get in!

Posted on Apr 07, 2014

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Posted on Jan 02, 2017

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I have a Crate g120 cxl guitar amp. it is switching between channels on it's own. (no footswitch)


Hello Jamie.
Your right, it is not rocket science, this is way bigger and funnier!
Now, that you took apart the chasis fron the cabinet, you may try testing if the channel switching occurs when you hit the Printed Circuit board with some tool like the handle of a screwdriver. you can try with light hits and different places of the PCB while watching what happens in the front panel light. also you can try bending the PCB with your hand to see what happens, if the switching occurs, maybe you have a cracked solder on the pedal jack or in any component related to the switching circuit, in this case, you will have to pull out the pcb, and re-solder those points that can be cracked. Using a magnifiying glass is very helpful in looking for those cracked solders.
Good luck and best wishes.

Nov 21, 2014 | Crate Music

1 Answer

How do you fix a stuck foot switch on a Digitech RP350 guitar processor?


You might want to take it apart and clean it. My bass player had problems like that and I took it apart to see if I could find out what was wrong, It looked like a mouse was living in there. Its amazing how much crap builds up in those things. Just pay close attention to what you take off so you dont have problems assembling it back together. Maybe even take pictures if your electronically challenged like me. otherwise the botton might be shot, hopefully not. good luck to ya, I hope I helped. peace!

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1 Answer

Yamaha psr 550


When PSR550 keys stop working, or are intermittent, in any arrangement, this can be fixed (with work). There is probably TINY dust or debris which prevents a clean key contact from taking place; you must unscrew and open the PSR550 up like a ****, then unfasten the bottoms of the keyboard circuit boards. You can figure out how to move them without totally disconnecting them. You will observe how a tiny rubber-mounted contact presses against an interleaved circuit-board connection pattern to make contact when a keyboard key is pressed. Any dirt or crud on the contact area of the circuit board must be removed, because it will prevent the conductive contact from bridging the circuit cleanly and fully. I used 91% alcohol and QTips to clean all contact surfaces. It took me a couple of disassemble/assemble cycles to get all the keys clean and working, and the PSR550 back together. But first download the service manual: it will show you how to open it and access various components. You will see that the keyboard switches are much like calculator buttons on a TI-83 calculator. They are pretty well enclosed, but you will see how much dust can settle in just through various humidity conditions, especially if you take it to gigs. Good Luck.

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1 Answer

I bought a Behringer Xenyx 2442FX Board on Craigslist, knowing that it wasn't powering up, but figuring that it was just a bad fuse and the guy didn't know what he was doing. I was wrong. ...


The C23 part is a capacitor and the 7085 is more likely a 7805 which is a voltage regulator. The regulator is easy to find. For the capacitor, you will need the service manual to determine the value required. The main issue is that the leg of hte 7805 is lifted. This implies that the part was conducting more current than expected. This is an indication that the problem with the regulator is a RESULT of a problem, not the defect itself. I would not suggest replacing the power supply blindly as the root cause may beon another board. Just changing the power supply board may result in the same problem again.

I would suggest a trip to the repair shop to get a detailed repair estimate. The shop shouldbe able to determine whether or not the only issue is the power board.

Also, from the experience I have with Behringer units, the power boards are unique to each model.

Dan

Aug 20, 2011 | Behringer XENYX 2442FX Mixer

1 Answer

I tried to use the Send as a line out on a Marshall MG50.It would not work and sometimes the sound would cut off when the cable was plugged in to Send.I've never had this situation with other...


Assuming that the amplifier has no other problems (till this one come up) and in case you don't use the "send" connector frequently, I believe that it's some kind of "dirt" in the connector. Switch of the amplifier and use a contact cleaner spray (available at any electrinics' shop) in order to spray in the connector. Plug - in and out many times a free male connector into the female one for the contacts to clean up. Allow some minutes the amplifier to dry and check the results.
Also make sure that the cable that you use for "send" audio is working. In case of a short-circuit cable you may come to the same problem.

In case of a problem or clarification or further details needed, don't hesitate to post me a reply before rejecting my answer.
If you are satisfied, accept my solution.

Thanks and regards
Stelios
direct FixYa link: http://www.fixya.com/users/technical114

Jul 04, 2011 | Marshall Mg50dfx 50-Watt Combo Guitar...

1 Answer

I have Mackie mixer cfx12 all the channels work except for channels 2 & 3, I turn the pre amp trim pot all the way up but no input is present, I also tried solo PFL for these two channels and no...


I suspect one of the upfront IC amps has been damaged. This can happen if people power the mixer from a receptacle that is different from where other connected equipment is powered such as amp. For example, mixer is at one end of the hall and other inouts such as an output of a guitar amp is plugged in. If a ground fault or spike occurs, teh ground bounce can exceed the common mode voltage of the input amps.

In your case, the inpout amps are discrete transistor types.

A voltage surge into the inputs of your unit would LIKELY pop two bypass caps that are 330pf. For channel 2 these are C205 and C206. Check those for shorts.

VERIFY audio is available at the "send" (tip) of the channel insert connector... this verifies the preamp stage. You can PROBABLY plug a set of headphones in to check this... ONLY one side will have sound of course. Verify this is a good test by checking a working channel. The level will be quite low and we are looking for just some signal.

IF you do have signal on the channel insert send which is the "tip" of the channel insert with the trim turned up, let me know and I will check the schematic for the next thing to check farther down the line.

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3 Answers

Marshall MG250dfx's sound fades out


I have read that the problem is in the FX send/return jacks which oxidize if not used much. All you have to do, apparently, is ram a jack plug in and out a bunch of times. This breaks up the oxidation, and allows the amp to work properly again.

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1 Answer

Power on and all of the green channel lights stay on (solid)


Unfortunately, this is not a problem that will be easily resolved remotely. As far as I know, the main module is not a replacement part. These units are pretty rugged and it sound more like you have a power supply problem rather than a board problem. If you have not worked on one of these before, please do not attempt to dis-assemble one. These are a bit tricky to work on. More than likely, the problem will be either in the power suppy, or be a couple of defective surface mounted op-amp ICs. None of the parts required should be expensive. Based upon your description, I would expect a parts cost in the $15-$30 range.

Where are you located? Perhaps I can recommend a service shop.

Dan

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2 Answers

Casio CT-670 Tone Bank keyboard completely dead


How familiar are you with schematics? I've just found my CT-670, There where marker marks on the keys. I cleaned it up. I took it apart as one channels had no sound. I love this machine. I want to find a manual for it also schematics would be very helpful for me too.
I would suggest looking inside for burns on semiconductors. or loose soldering. I need to replace a chip that has no cross reference... that I've found yet... I think it's an amplifier but need to spend more time on it....

Mar 14, 2009 | Casio Music

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