Question about Lexicon MX400 FX unit (with )

1 Answer

I think I've a failed unit. Turning it on - the USB flashes and then it remains on the logo splash screen. I have tried numerous times to factory resent - holding down the System button on power on, the following the instructions to reset. It appears to reset, I have the scroll bar then upon completion, it reverts to the logo screen and no button push or combination will change it. The LCD continually reads 1.1. The USB stops flashing after about 5 or 10 seconds after power on. The unit is clearly out of warranty. If not a fix you can provide via communication, would you please advise the cost? Thank you in advance. If I can't know the expected repair, I'll probably have to junk it if we don't have a fix. Things are tough, you know. Thank you very much.

Posted by itstoyou on


1 Answer

Fred Yearian

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Lexicon Master
  • 5,603 Answers

It MAY be waiting for an UPDATE of firmware via USB. In other words you may have triggered an update mode that it will not exit without sending an update. The second possibility that comes to mind is that one of the buttons or the switch behind it may be stuck which can lock up the processor. Look for a button stuck in or that feels un-normal.

Posted on Aug 23, 2011

  • marcos
    marcos Dec 08, 2013

    Same problem here. Machine was working fine until I left it on storage for about a year. I wonder if is not a relay problem, or something?



Add Your Answer


Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

Sound keeps turning off after ten muients

I've had this problem with other sound equipment. For me, it was a heat issue and there was an auto shut off feature to save the unit from over heating. I would especially think this is the case if it turns back on without problem after another 10 minutes of being off.

You could try turning off phantom power if it isn't needed to run your mics. Or making sure it is in a spot that allows maximum air flow through the head.

Hope this helps! Don't forget to rate!

Jun 26, 2012 | Phonic Powerpod 740 Plus S715 PA System

1 Answer

Bcf2000 will not power up

check the main switching ic. might be faulty, could be heating.

Feb 25, 2012 | Behringer BCF2000 USB MIDI Controller

1 Answer

My Korg CX-3 MIDI configuration tests for upgrading to Version 2 have failed numerous times. However, I am confident that it is not my MIDI interface. All Global settings and parameters seem to be...

If this is a flash upgrade to the unit be VERY careful as a failed upload can leave unit dead. They usually have pretty tight checks to prevent an error from killing the unit during the upload. For certain music products I have found that I had to upload an in between version first that was available before uploading the latest current version.

Jul 29, 2011 | Korg Cx3 61Key Modeled Combo Organ

1 Answer

Im using a behringer ucg102 guitar/usb interface, im getting a very bad hum/hiss.. i've tried 3 different guitars and multiple jacks. im not running any guitar effects yet, i've removed the...

Try this using a differeent computer. Some computers generate a lot of digital noise. Also use a lot of gain from the guitar to improve the signal to noise ratio.

Jul 23, 2011 | Behringer energyXT2.5 Plus Portable...

1 Answer

I donnt think you can solve it the amps must be blown up and i dont think you would know

Most Amps that blow are down to failed Capacitors and ocassionally down to the Transformer or other components.

If you can have a look at the internal PCB and see if there are any Capacitors with bulges on the top or fluid leaking out of them then they've failed.

They're very cheap to replace but you'll need a soldering iron and the ability to desolder the old and resolder the new.

Jul 15, 2011 | Orange Amps Orange Sundown Rover 15 Watt...

1 Answer

I've had my Taylor T3 for over two years with no problems. Done a lot of gigging with it as my main axe. Just got off the road and discovered a major problem: the volume on my neck pickup is...

More likely a failed selector switch. Try working it back and forth a few dozen times. Contact cleaner may be tried too, squirting in the back of the switch.

Jul 04, 2011 | Taylor T3 Guitar Electric Hollowbody

2 Answers


Hi pcruzx,
Sometimes replacing the fuse alone with exact voltage and ampere ratings will cure the problem(you're lucky) but not all. Sometimes further damaged gone to other parts most especially the voltage regulator transistor/IC (mounted in heat sink) and the opened the fusible resistor in line with the supply(B+).
First check the fuse, for sure it was already blown. If you've replaced the fuse and immediately blew again after powering on the unit, this was an indication of shorted parts near the AC line. Click this LINK for more info.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

May 01, 2011 | Alesis Dm5 Drum Module 18 Bit

1 Answer

It works sometimes but mostly never. The power is on and the screen is blank.

For anyone who still has this issue including above morris_gray,
I've encountered this myself with my first generation M-Audio Axiom 25 USB MIDI Controller plugged into a MacBook using GarageBand (G2 apparently has identical malfunction).
It should be noted that I never installed any type of software for the device, that came with the device. I simply wanted a controller for GarageBand, and I will also note that it has worked flawlessly for about 4 years on this setup, until about a week ago...

I'll provide what information I have gathered about the blank LCD screen issue as well as the controller simply not functioning correctly as listed below:
The most common way people test/fix this is to "hard reset":
- turn controller off (assuming you've kept the usb cable connected to your computer)
- hold down both the + and - buttons directly below the lcd, and simply turn the power on. Some numbers should appear on the lcd soon after the reboot and you are okay to release said buttons...
I've read testimonials, watched videos of people doing this and successfully getting their device back in action, though the reset will default anything you have saved for the device.

Sadly, this did not work on mine. I've tried several different cables- in several different usb ports- on several different computers (as suggested by M-Audio on their support page. I still get a lit up but blank lcd. I've even tried to still use it but only some awful noises come out and nearly every function just makes the thing freak out and it becomes silent/unusable/useless.
M-Audio suggests sending it back to them for fixing at this point.
Because I've had my Axiom 25 Gen. 1 for so long and I have never installed anything what so ever that came in the box, and have little faith that M-Audio will replace mine, I will most likely try to take it apart and mess around with the electronics inside as it's just a big paperweight now.
I did read that in the Gen. 1's the blank lcd could be a result of a chip gone wrong, so to speak... Gen. 2's had some type of "grounding" issue that resulted in the blank lcd and such.
I hope this helps anyone, if I stumble upon a way to fix this through my own curiosity I will inform the masses...
I'll be on the hunt for a new controller most likely and it probably wont be an M-Audio...not that I'm upset with the product, it lasted me quite a while and I've made a lot of solid songs/music with it, but rather I feel the need for something different and maybe a little more sturdy that can actually be a synthesizer on its own, not just a controller.
- Christoffer

Mar 29, 2011 | M-Audio Axiom 25 G2 USB MIDI Controller

Not finding what you are looking for?
Lexicon MX400 FX unit (with ) Logo

340 people viewed this question

Ask a Question

Usually answered in minutes!

Top Lexicon Music Experts

The Knight
The Knight

Level 3 Expert

76416 Answers

Brad Brown

Level 3 Expert

18438 Answers


Level 3 Expert

85239 Answers

Are you a Lexicon Music Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides