Digitech RP3 Guitar signal processor only lights up.

You have probably damaged the board that the plug is attached to.

Contact maker Support at the bottom of the page.

https://digitech.com/dp/rp1000/

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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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Usually the manuf. have diodes used as protection against over voltage or adapter polarity issues. Try the correct adapter (sleeve and tip have specific voltage polarity...check for drawing denoting each) and if it fails to power the unit up, it's probably time for Digitech authorized repair.

Make sure you have the OFFICIAL Digitech power adapter. Universal adapters or those for MOST other pedals will NOT work... things may light up but you will NOT get audio. This unit requires an adapter supplying 9 VAC (not DC) at about 1 amp. These AC output adapters are not very common and people get the units without an adapter and try using universal adapters and they do not work. An AC adapter is used by Digitech so they can generate both plus and minus voltages internally. I don't know what your utility power voltage is in Cebu, so you need to get an adapter for your voltage that will give 9 VAC output and fit the power jack on the unit.

Check to make sure the output jack has not broken away from the circuit board. If not it may have to go back to Digitech.

All DigiTech expression pedals use an optical system instead of potentiometers.

Either the light is broke, or the filter.

The filter protrudes from the bottom of the pedal, and is darker at the top and gradually fades to clear at the bottom. If this breaks off, then there's nothing to limit the amount of light to the optical system.

If it is the light, then you'll have to have it serviced by someone qualified to work on it. Your local music shop should be able to help you out.


Hope that helps!

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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.

It sounds like the guitar level input to the unit is too low.

NOTE: With this product you MUST use an amplified or electric guitar that has a preamp within it.

If you have a straight guitar that does not have an amp in it, buy a preamp to first run the guitar through.

A friend of mine had the exact same problem. In his case the pedal is only good for hammering nails now. If it still has it warranty I'd say look into that, if not you've got nothing to lose. Open it up, look for unattached wires. Also, try using a battery instead of an AC adapter..

You need a directional microphone, and then it needs to be pointed away from the guitar. Another technique would be to provide some acoustic insulation between the mic and the guitar, like a wall or a partition like what is used to set up office cubicles.