wersonnst

:Nitroflash Did you ask line6 for service? Check the ribbon cables, on mine it was the fault. Messure every single pin. Repress the IDC conections. Could be everything else : Missing voltage , broken IC. nice mixing everyone M20D Rocks

fabiogramani: It could be the same Problem. Until there is warranty please contact Line 6 and open an service ticked. They will help you. If you are familiar with working on elektronics. And on your own risc. You can open it and check: For bad connections in the ribbon cables and IDC's. Bad soldering. Oxided connectors. Broken Jacks. The circutboards. Connections to the case. Everything else. If possible and nessesary, messure Connections and Voltages. So Problems on mine M20D are Back. First Chanel 2 than an week later chanel 2 ,3 ,4 . I opend it an checked my isolation to the case , witch was ok. So I messured the ribbon cables and found bad connections in the IDC's on both end's. Repressing the idc's and contact spray on the socked strips solved the problem. Now it's fine again , hope it will be for more than a few weeks. nice mixing everyone M20D Rocks

: litesnsirensThat's exactly what happend's. For me i figured out the problem is after the mic preamp and before the A/D converter. And there are the cable connections. I use my M20d every week so if there were new or other problems I will report. The last weeks there where no problems. :) nice mixing everyone M20D Rocks

Finding the key problem of volume drop issue. (the story) I've done an deeper research in my m20d to find were te problem comes from. During the process i recunstruckt the input circut, simulated it, mesured all voltages and added components. First the known results what could happen.: On mine it effects channel 1 to 2 , 3 phantom power on. Mostly after a time of low signal input the signal droped. Then when you touch the Mic or make an loud signal to the Mic the Mic volume comes up again. On my rode M2 first the signal distorted then it plops and all is normal again. On an recoded error i saw that the signal was cutted in the upper wave. Push an pull will result in signal drop. Strange that push an pull forward and backwards off every channel will result in an volume drop on channel 2 or 3. an short clip: http://www.age-joh3-16.de/wersonnst.de/bilder/prob.mkv Workarounds: touch the Mic loud input signal to the Mic chance preamp volume grounding the mixer internally (helped but not fully maybe the open and close process, and reconnecting the ribbon cabels brings lost connections back, so problem is gone) what it is not: the Mic's the Mic cables the input jack's the a/d chips an DC offset what it could be: the gain setting in the mic preamp dropped to 0 db (pga2505) anything in the input from the Mic to the a/d chip an DC offset an short from in output board to the case (that is it!) bad connections in the ribbon cables (in my case) thoughts about the key problem: if it's an gain Drop to 0db in the mic Preamp (pga2505) there must be an fail in the serial communication to the chip. That could happen if enable pin (cs) gets ground signal, an the clock(sclk) signal is present. The sdi pin is ground an so it sets all bits to 0 what means gain 0db. On display the gain setting is ok but the preamp has the wrong value. To get the right value you can bring the input signal up so the trim tracking option will reduce the singal by 3db witch sets the preamp value new. Or you set the gain setting by hand. Somtimes you must gain up 3db to bring the gain up again. That's because the pga2505 has only 3db gain steps. if it's an DC offset : maybe an DC offset before the preamp because there are no DC symmetry resistors maybe the offset is produced by the 48v phantom in combination with the open coil and capacitor in the line in section of the Mic input. The offset could be in the input circuit of the a/d chip (but i think there is symmetry grounding) If'e put an symmetry grounding in the input before the preamp(pga2505)but it not solve the problem. My wife had the idea of could be an short to the case. And it was. Finally what solve the Problem: Three layers tape to isolate the case in the right place. And an row hot glue to make more space to the case. First all was good but three weeks later the problems came back. Channel 2,3,4 began to drop signal. So i checked the internal ribbon cabels, an found bad IDC connections on both end's . I repressed all IDC's and used contact spray on the socket strips. For now that solved the problem. hot glue , ribbon cables whith IDC socket strips for the freak's: input preamp texas instruments PGA 2505I a/d chip circus logic cs5364-cqz nice mixing everyone M20D Rocks

The pins of the connection from input output board (1 to 6) to the A/D Board are shorten to the back casing. Isolating the caseing in this area whith tape solved the problem. nice mixing everyone M20D Rocks (pictures come later)

I did this to bouth PC boards . They are similar. On these boards are the mic in, line in monitor out and main out jacks. Yes one for each row of Jacks. The Phone ,Aux in , SD Card , USB Port , Foot Switch are on seperate board's. I bought mine last year used in Britan and imported it. So there is no warranty. If there is warranty on your M20d and you have an fault. as dboomer said, You'll need to open a service ticket to talk to Line 6. I'm sure they will be happy to help you.

Hi there, The most of your problems will be the fixed by grounding the in an outputs propertly. But first If there is warranty Use it ! Line6 will help You! This Happend because the Switch signal which detects an insertet XLR OR 1/4" is based on Ground Potential. The Pluged in detection swiches are ativated by losing Ground. The Ground Potential for each channel is connected via seperate spring elemet's to the casing. (Picture) The casing GROUND is only connected by screws. The most m20D's where this happend are an few years old where the surface begin to oxidate and the Ground Potential gone away. The Harware had Ground Point's for Cable connection's but they are not used. For the Signal in the Ground is not nesseary, but for the input and output detection of XLR OR 1/4". If it lost Ground it will detect 1/4" Jack first. For me I solved the Problem by Grounding all canal 's and the top back and bottom case by wire and brought them to one Ground Point . Nice Mixing everyone. M20D Rocks. http://line6.com/support/topic/8852-m20-input-level-disappears/

No I don't get a screen full of inputs when nothing is connected? (Yes in an test without case) And Ground is seperat for each chanal so it would be more one. For the Signal the Ground is not nesseary, but for the input detection of XLR OR 1/4". If it lost Ground it will detect 1/4" Jack first. And that could be the Problem. To check this lose the screws of an Kombi Jack and test it. For me I solved the Problem by Grounding all canal 's and the top back and bottom case by wire. I had the Problem on Chanal1. First all was good but after an wile the signal Droped to 25%. Maybe 12db Pad for 1/4" i'm not shure if the Pad is hardware. The signal droped is the same as when i connect the Mic in the 1/4". After many Tests i could aktivate the Drop by pusching the XLR jack hard in. After disconect and Pushed it gently in all is normal but rattling a little bit it dropt again. I open'd the kombi jack but no problems to see. (picture) An other Problem is on Stage, that the cabel's of hanging to the Ground and pulling on the Kombo Jack's in the right way to loosing Ground. Nice Mixing everyone. M20D Rocks.

This Happend because the Switch signal which detects an insertet XLR OR 1/4" is based on Ground Potential. The Pluged in detection swiches are ativated by losing Ground. The Ground Potential for each channel is connected via seperate spring elemet's to the casing. (Picture) The casing GROUND is only connected by screws. The most m20D's where this happend are an few years old where the surface begin to oxidate and the Ground Potential gone away. The Harware had Ground Point's for Cable connection's but thy were not used , maybe in the building process they saved money (cabel). If there is Garranty Use it!

That is the way i do it this Time but Not the Way it should be done. The Software is mostly Based on Unix Code. But the asio driver is not compiled for Linux. Please make one.

Hello, a few Features that would be nice. 4) Play recorded Tracks and add (record) an new one at the same time. For Second Singer or something else. It is possible to record an play on the media player at the same time, but it would be ideal to start the playing and recording simultaneous . And to add only one Chanel to an existing record. 5) An complete overview of all channels with level meter. 6) In the fader screen witch is great every time the main out. 7) All faders together with flip pages left right, or flip pages (inputs ,outputs, etc) up an down. 8) Multitouch faders (faders simultaneously). 9) On I pad the RTA in the EQ section. 10) On I pad the knobs become fader on touch (popup) it become very easy to adjust . This time v1.20 every time i want to adjust the knobs the knobs become other direction. Is it in the middle I had to do left and right, it is left i had to do up and down. 11) Save an downmix from an recording. Have an nice Mixing! Thomas

Hello all, I've done all my Musik with an Linux system (this time LMDE) and Jack. I hope there will be an linux driver for the M20d. I use the M20d for live performance and to record the inputs. Because of our life Stages (mostly churches) Monitors and PA the main out is useless for an CD or to give away. It's very nice to make an mix of the recordings on the M20d that sounds great for every one. To save the main mix I want to use the main out via USB but I found no driver for my Linux Studio. Or is it possible to save the main output to USB Disk. Is there an chance to get it working on Linux systems , maybe with wine and wineasio? Regards