Here is free modification information you can use to enhance your radio! As well as schematic diagrams for various electronics, etc. See the pages below!
I have not updated this website in a couple years but will add this here about the ALESIS IO2 EXPRESS:
(I can’t make a new page as the web host “limited” the number of free pages you could use a couple years ago and I am over the limit already, also another reason I stopped using this website.)
ALESIS IO2 EXPRESS all lights on repair (photos below) This may also apply to the M-AUDIO M-TRACK but I'm not certain, you will have to compare the board to the pics.
NOTE: if you do not opt to repair your unit and want to sell it, please contact me, if the price is reasonable I will buy it from you, can pay with paypal as it is safe for both buyer and seller.
Problem / symptoms: VU meter lights all lit up / on, accompanied by the USB light.
The VU meter lights should only light up with a MIC or instrument plugged in and the gain turned up with a signal present. If they come on as soon as you plug in the USB cable, there is a problem and the unit NEEDS repaired, no settings will fix this.
Fault: loss of negative rail voltage. The negative rail voltage is made from a charge pump regulator IC which works like an inverter to reverse the polarity of the voltage to create the negative supply rail (for the split power supply).
Bad part: board designation= U10 marked PFNI replace with TPS60403DBVR
It is a surface mount part on the bottom / solder side of the board. To remove, apply solder to three pins on one side (bridge all joints) then the same for the other side, alternate the soldering iron to each side of the chip until solder on both sides is molten, you must do this quickly, and then the part will slide off the solder pads and can be easily removed. This may take a minute to get the hang of, be careful not to apply too much heat for too long and do not force the iron tip into the board or you may damage solder pads / traces. You simply want to melt the solder then carefully slide the part off the board.
Once the bad part is removed, clean the solder pads on the board (remove all excess solder) and make sure there are no solder bridges between pads. Then install new part, that’s it. Inspect other parts in the area for damage but from my experience repairing 3 to 4 of these units no other parts were found bad.