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Rusty
Rusty, Music Professional
Category: Electronic Musical Instruments
Satisfied Customers: 5524
Experience:  Sound Engineer, Electrical Issues, Tone Consulting
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I have a Roland Digital Piano ep 880 which powers up, all lights

Customer Question

I have a Roland Digital Piano ep 880 which powers up, all lights flash normally but there is no sound. I've checked Local Control is On and V-Link Off; no headphones are connected and volume control seems OK - all the things in Troubleshooting in Owner's Manual. What else can it be? Thanks. Martin
Submitted: 3 years ago.
Category: Electronic Musical Instruments
Expert:  Rusty replied 3 years ago.
Hi Martin, my name is Rusty. Let's take a look at a couple of things to narrow down the problem. Are you able to get sound from the headphones? How about percussion? These use completely different parts of the keyboard, and will give me a clue as to where to start.
Customer: replied 3 years ago.


Bear with me, I don't use headphones and am trying to locate some.

Expert:  Rusty replied 3 years ago.
No problem, take as long as you need. Since they use different amplifiers than the other outputs, it's a great reference point. Let me know when you get a chance to test them.
Customer: replied 3 years ago.

Tried that - nothing on headphones and there's no percussion on this digital piano

Expert:  Rusty replied 3 years ago.
Ok, sorry, I forgot that piano doesn't have percussion. Press the demo button, it uses the pitch bender just like percussion. Does that one play? I think we may have to open it up... Are you comfortable with that? We'll try everything before we take it apart, but if your demo song doesn't play, I suspect a bad mixer...
Customer: replied 3 years ago.


No - tried the demo button. I'm going to have to leave this matter open overnight (in UK) as I have to go out now and haven't the time to open machine up!! Is that Ok? I'm grateful for your advice.

Expert:  Rusty replied 3 years ago.
Yes, that is fine. We can do the repair on your own time.

Unplug the keyboard, and hold the REC button for one full minute to drain all of the power from the keyboard. While still holding REC, plug the keyboard and turn it on. It will initialize. Please let me know if it does not.


If it initialized and still doesn't work:
What I will need you to do is open the keyboard, and identify the parts as follows:

Amplifier-Has the big capacitors, and is connected to the output jacks.
Headphone amplifier-Connected to the headphone jack.
Motherboard-Nothing on it will make sense. It's the brain of the operation, and is not where the problem is.
Pitch bender-Feeds into the mixer.
Tone generator-Also feeds into the mixer.
Mixer-Feeds into the amplifiers.

I need you to test voltage at the input of the mixer from the tone generator. Test for .3vdc, or in that range. It will vary depending on how hard you hit the key. When you locate that voltage, test the output of the mixer. Do you have output? If not, we need to replace the mixer.

Let me know if you have any questions along the way. An initialization may fix the entire thing, so first concentrate on that. Open the keyboard as a last resort.

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