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I would go for getting someone else to record at studio, means they have all the professional ideas to bring to the table, solve problems, but if your just playing around in home a small focusrite 2/2 should do you, with 2 inputs for left and right mono from desk, or also dual linking in two separate channels via xlr.
Voltage readings are normal. I don't know what you mean by dissapator? There are five separate heat sinks on the board. Which is heating? Is this with the load connected? If no load is connected none of the heat sinks should get hot. In regular operation with the fan running they may get warm. If no load and the big one is heating, then one or more of the three terminal regualtors has shorted. If the one with the big diodes near the 70 volt caps is heating, look for shorted surface mounted caps on the bottom of the board near the 70 volt connectors. If the heat sinks with the IGBT switchers are heating, look for a bad gate speedup surface mounted diode. It is unlikely the input diodee heatsink is heating.
You will probably have to go to Line 6 to get a schematic... HOWEVER, it is likely a visual inspection will reveal the failure due to dropping. Look first for bad solder at the headphone jack. Next under a bright light look for circuit board cracks. This is going to be surface mounted parts and unless you have an equiped shop, it is not likely you can successfully work on the board if it is not a visible problem.
The board may appear undamaged, but the instrument's behavior says something is broken. I have no idea what kind of musical instrument this is, but circuit boards are all the same.
Especially on boards with narrow circuit traces and surface mount parts, damage can be very hard to see. A trace might have a hairline break which would be impossible to see without bright light, strong magnification, and some idea where to look.
It's also possible that the board is fine, but some part has been damaged. The lead from some part may have broken away from the circuit trace, for example. Or a small surface-mounted component may have popped off completely or had a lead broken off.
Unfortunately, this kind of trouble is very hard to fix without detailed product information (circuit diagrams and board layout). Unless the manufacturer makes a service manual available to the general public, this means sending the unit back to them or an authorized service center for repair.
Intermittents are a pain. It is likely that one of the analog power supplies, plus or minus 15 volts usually, had failed or a connector came partly off. Also a bad plated through hole on a circuit board could be the problem or a bad solder joint. Behringer uses switching power supplies in their equipment and a LOT of surface mounted parts. A less likely possibility is a failing electrolytic cap that is barely hanging on.
You can be pretty sure the problem will be back at the worst possible time.
I have a PMP5000 that I had to resurect. I had to trace out the power supply to repair it.
I can give you hint: First, a small supply runs directely from the line and generates some of the small voltages. While this starts, the main power caps are charged through limiting resistors. The main switcher is brought online and if the power amps acheive balance, then a relay connects the speakers and shorts the limiting resistors.
This is what is in the 5000 and I suspect the 3000 is similar.
In my 5000, there was arcing at one side of the power amps. The board was burned and three power fets fried. Cancer of burned board had to be carved out and traces replaced by hardwiring.
In addition, the limiting resistors were blown open, both main switching transistors were blown and 4 small driver transistors (surface mounted) and several diodes AND a switching regulator chip (surface mounted).all fried/
Hint: When restarting the unit, put a 150 watt light in series with one of side of the power input to limit the current in case you did not get all the dead bodies out.
This is a class "D" amp which drives PCM waves into a filter which is then the audio output. It is much more efficient thaan a linear amp.