Yamaha YPT-220 - no sound from speakers or headphones


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My Yamaha YPT-220 has not been used for a number of years. A few days ago I turned it on, only to find that while the buttons and display work, there is no sound from the speakers. Headphones do not work either. There is nothing plugged into the headphone jack.

Some research suggested that the amplifier chip (BA5417) might have gone bad, so I replaced it, but the sound still does not work.

Inspection of the headphone jack shows some mild corrosion on the inside - I thought this might be the culprit, so I removed the jack altogether, but there was still no sound. I have no idea how the mechanism by which the keyboard 'detects' that headphones are plugged in works though, so I don't know if this rules out the headphone jack being the problem.

Is this a common problem? I have very little experience with keyboards, this is the only one I have ever owned and I'm by no means a musician! Any ideas on what could be causing this?
 

SeaGtGruff

I meant to play that note!
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I was going to ask if you'd done a "factory reset" yet, but apparently there's no need to do that because all of the panel settings and function settings get cleared whenever you turn off the keyboard.

The two most common "software" causes of this problem are (1) that the "M.Volume" function got set to 000-- in which case the styles and songs should still play, unless the "StyleVol" and "SongVol" functions are also set to 000-- or (2) that the "Local" function got set to OFF. You can check those function settings to make sure they aren't the problem, but they should be getting reset to their default values whenever you turn the keyboard off and on, so I doubt that they're the problem.

I don't know much of anything about the hardware side of things, but aside from the PHONES/OUTPUT jack you might check the MASTER VOLUME to make sure there's no problem there, such as perhaps a loose or broken wire.

If you don't already have it, the Service Manual is available to download from the ElektroTanya site. There is a built-in "test program" that you could run to see if it can detect any problems. To start the test program, turn off the keyboard, hold down a C# Major chord in the second octave of the keyboard-- that is, keys C#2, F2, and G#2-- then turn the keyboard on while continuing to hold down the C# Major chord. There is a description of, and instructions for, the test program on pages 21 and 22 of the Service Manual.
 
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Hi, and thanks very much for your reply!

I've checked the various functions, and they're all fine, and as you say it resets anyway when it's turned off, so I'm fairly convinced it's a hardware problem.

The master volume board looks fine, and thanks to that site you mentioned I was able work out how the headphone jack works and confirm that that was not an issue.

I ran some of the pertinent tests mentioned in the service manual, but everything came up as 'OK', so not really sure where to go from here.
 

SeaGtGruff

I meant to play that note!
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Unfortunately, I'm not very knowledgeable when it comes to hardware and electronics, so I can't offer any informed suggestions about what might be wrong.

However, if you end up needing to replace your YPT-220 then you might be able to find a working used PSR-E3xx or YPT-3xx on your local Craigslist or similar site. The models in the 300-series have more voices and styles than the models in the 200-series, plus a velocity-sensitive keyboard, which would be a nice move up for not much money.
 
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happyrat1

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You might want to pick up an ESR meter and check the electrolytic capacitors in the audio chain.

Also perform a visual inspection for bulging or leaking caps.

Since it sat unused for years there's a good chance that one of the filter caps in the audio output stages has become leaky or shorted.

Gary ;)
 

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