I need a service manual with a circuit diagramme to repair one of these with an input circuit fault.

If the right input on your Behringer Ultracoustic ACX1800 CD is not working, it could be due to a number of reasons, including:

1. A faulty cable or connection: The problem could be as simple as a loose or damaged cable. Try swapping out the cable with a known working cable or check the connection to ensure that it is secure.
2. A blown fuse: The ACX1800 CD has a built-in fuse that protects the internal components from power surges or other electrical issues. Check the fuse to make sure it is not blown and replace it if necessary.
3. A damaged preamp or amplifier circuit: If the problem is not with the cable or fuse, it could be due to a damaged preamp or amplifier circuit. This can be caused by a number of factors, such as overheating, power surges, or other electrical issues. In this case, you may need to take the ACX1800 CD to a professional repair technician to diagnose and fix the problem.
4. A faulty right channel input jack: It is also possible that the right channel input jack itself is faulty. This can be caused by wear and tear over time or physical damage. In this case, you may need to replace the input jack or have it repaired by a professional technician.

It's a Chinese made Roland and no service information is available as when a fault is found the main board is replaced, eliminating the need for service information.
I would check that it is a stereo out jack and not mono. If it is a stereo out, check that both input phonos work. If they do, replace the faulty socket or damaged pcboard.

If you work on Class D amplifiers you would not need to ask.
They are very specialized and awkward to repair/fault find.
Here you are anyway; https://elektrotanya.com/peavey_ipr-3000_amplifier_sch.zip/download.html

first need to know if the other device you connected it is with dmx and if not, the most likely need replacement on the circuit 8 pin controller dmx its easy to know the locate its the circuit most close to the input signal, I hope you test the input volt regulators and are well, if not also need more data presents fault.

Don't do what Fred said. this is a complicated switch-mode amplifier - you'll need to pass it to someone who knows these.
after you recplace the obviously burned parts, you need to run it up in test mode and go through the test procedures until you find the other faults that caused it to fail.

I am very new here and don't know how to answer a question to a specific problem so I will write about the most common problems that I have had over the decades doing guitar amp repairs. If you find that your amp is extremely low in volume and then suddenly comes back to normal- check out the effects return [or power amp in] jack. Especially in Marshall amps-these corrode and your signal dies. If there is loud noise such as hissing and crackling with no guitar patch cord in the input jack- the input jack is likely at fault. They normally have switching contacts that ground part of the input circuit when the 1/4 inch male plug is disconnected. When this in is corroded or too weak to make normal contact, you can get these symptoms. If your amp is a solid state Marshall or Fender and there is a random buzzing sound with no guitar signal connected- hit the side of the amp and listen for the buzz to go away or become louder-if it does, this usually means that the connections are loose at the two large filter capacitors. In one or more Marshall amps, they use a filter circuit in the low voltage power supple for the preamp tubes. If you encounter a dead Marshall[the model escapes me now] remove the circuit board and resolder the four connections at the bottom of the bridge rectifier. If you have any other amplifier repair questions you can email me direct at [email protected].

Oh yeah... know them well The IGBT transistors fail, the sand coated resistors blow open... replace as a pair. The driver transistors get blown... 2SA1020's and 2SC2655-Y's. One or more of the gate speedup diodes for the IGBT's get blown. The switching reg chips, IR2153 is usually gone. and more...

Here is your service manual: http://elektrotanya.com/behringer_europower-p0569_hca2400_sps1000_dpx_pmp-1280s_5000_sch.pdf/download.html

Scroll down to "get manual" and click to download. Ignore other "download links".

You will likely find that one of the power amps has shorted... been there, done that several times. Usually the channel A (rearmost) power amp shorts takeing out the 9140 Mosfets and other parts. Often an internal short between an interior and upper layer of the amp circuit board is the fault that causes all this. Use a light bulb (150 watt) in series with the power input when testing after repair. Use an isolation transformer when working on the supply for personal safety. When supply is running again, discharge the 70 volt source caps before plugging onto the amp to avoid welding arcs at the connectors. I have seen the supply hold charge for several days.

The fuse is inside and is to be replaced ONLY after you repair the cause of it blowing. Additional damage may result if repair is not made first. Power it up with a 150 watt light in series with the power cord as a resetting fuse. When light remains out, unit should be good.

The fuse is mounted on a circuit board behind the power input connector.

Here is a link to a service manual that is probably close to your unit:

http://elektrotanya.com/mackie_srm450_active_speaker.rar/download.html

Scroll down at the web page to a small link that says "Get Manual" Click on that and after download unzip the file... it is free... ignore the winrar thing...

You would need TWO DC supplies as they use AC so they can create both a plus and minus 15 volt power source to run the internal op amps.

Here is a schematic for the 1202 which has same power supply configuration as the 802.

http://elektrotanya.com/behringer_xenyx_1202.pdf/download.html

Scroll down to the little link "Get Manual" and download the service manual and schematic. You will find the power input in the upper left corner of page 5.

Email me and I will send you a link to download the SM. The file is nearly 12Mb. Put MG82 in the subject line.