My digitech rp 500 has power supply but it won't

Question edited for full 'make model (what it is)'. Plus it appears to be an 'RP', no an 'ro', and Capitalised.

It seems to have issues and because of that was discontinued. Take it to your local music store, they will know an electronics engineer.

https://www.google.com/search?q=digitech+rp+350+turns+on+then+off

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http://digitech.com/en-US/products/rp300a

I found both FDA2828N50F MOSFET transistors in the power supply were shorted. I replaced them and the amp worked fine. I couldn't find a reason for them to fail.

If the unit is in bypass mode, the display will indicate "BYPASS" That would bypass the RP355. You might try that to see if the problem is with the 355.

You might also have issue with the output being essentially low Z out if it is plugged into a High Z input.

Are you using the unbalanced 1/4 inch guitar jacks or the XLR? Is the XLR wired correctly? If not it may be grounding out the input.

If your eurozone power pack is the correct polarity on the coaxial power plug, the unit should light up. If it is not even doing that- check the polarity as it may be reversed from what you need. As long as the the output voltage and current is close to what the American power supply output current is- molded into the power pack, there should be no issue there if polarity of coaxial plug is correct. It should behave and respond to the various setting displyed on the RP unit.

Is it plugged into a computer? Did the computer recognize the driver? Is there a software conflict? If you have a windows machine, you can open the device manager and see if there is a yellow X or yellow question mark on the device- if so the driver either did not install, or there is a software conflict. you may need to to enable the audio for that input in "Audio Properties" in the control panel of the PC. If a mac- make sure it is selected under "Chooser".

In short- you should be able to plug your guitar into the unbalanced input of the RP, and then you can run a cable from the RP unbalanced output to the guitar amp. There are 5 different lengths of 1/4 inch jack in use- make sure yours are the right length for the amp, and the RP.

in bypass mode, the guitar should be heard, you can put the unit in bypass mode by pressing the up and down keys at the same time. Also make sure the amp is not in standby or muted either. These things can happen. It should work, it shoudl light up, it should give you visual indication something is or should be happening.

Likely the input rectifier and filter in the SR16 has shorted diodes or caps. Should be easy fix for a competent electronics tech.

You CANNOT use the Voodoo as it outputs DC voltage and the EX-7 requires an AC voltage and of 9 VAC and also 1.3 amps at that.

Here is the link to your manual if you don't have one:ftp://ftp.digitech.com/pub/PDFs/Manuals/RP90/RP90Manual18_0490_A.pdf Page 34 tells you how and don't forget to calibrate the expression pedal. Page 35 tells you how. Hope this helped.

Read your manuals for both pieces of gear carefully first. You only have one amp so you won't be able to take advantage of all the FX on the Digitech as a lot of them are designed for stereo. The Digitech manual shows guitar into the Digitech and output from the Digitech into input of any guitar amp. Since you have a Marshall and can already get some great sounds by running your guitar straight into the Marshalls input, you would probably be better off using your Digitech in the FX loop. Run a guitar cord out of the send on the loop into the input of the Digitech and a guitar cord out of the left / mono output jack on the Digitech into the effects return jack on the Marshall. Start out with the effects level on the Marshall all the way down. Do the same with the Digitech with both the input and output levels. (Read the manual carefully) I think the choice of the Digitech isn't that great because it is already trying to reproduce a lot of what you can already get with just your Marshall but with a little experimentation and some careful adjustments you should be able to add to the sound of the Marshall. Hope this helps.

Likely the supply was underated OR it is getting hit with a transient. Transients are common in some venue power systems.

There should be a label on the unit as to what the power requirements are. Make sure the power adapter is rated for that or more CURRENT in amps or milli-amps.

Are you sure the power supply has failed? There could be an intermittent in the unit, most likely with the inout power jack... They often get damaged by tripping over the power cord.

Try contacting their service center rep at (801)566-8800. They might send you a schematic for the pedal if you explain your situation. They do recommend using the original power supply PS0912 which should still be available. Hope this helps.