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.
(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.)
Below is the schematic for the old Pyramid Phase III PS7 power supply. I redrew it based on the one in the manual, and added the parts values as they left these old ones without a parts list.
A nice gentlemen / ham operator contacted me back in 2012 looking for a resistor value while trying to repair his, he gave me all the component values and the PDF of the original schematic so I could help try to determine what the burnt resistor was.
Components that may not be correct:
1.) R3, not 100% sure if 22-ohm is correct as the original burned badly, but that is what we determined would work based on the circuit, though may not be "original value"; it is in the current limit circuit and should work without it.
2.) I am uncertain on the rectifiers used as well. I put 1N5404 for something while drawing it, but that may not be correct, though, those rarely fail to where you can't read part numbers.
I have had this schematic on my PC for a number of years and thought it may help others repair their unit should the need a arise; does no good sitting in a folder I access almost never :-)... I haven't used this site in a couple years, and seldom check it, but wanted to upload this schematic.
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.