Piano, Organ, and Keyboard/Yamaha ME-300 no sound

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Question
Hi Thomas,
I have a 25 year old eletone organ. Model ME-300 F of Yamaha.
I have been playing it occasionally, about once a month and it works.

Suddenly it stops working today.

I usually unplug the power when not in use.
Let me share what happened today.

I on the master switch. The light came on, showing there is power.
But the other buttons did not work. Neither any sounds when I press the keyboard or leg pedal.
When I off the main switch, I could see fading lights from all the switches while I off the main switch.

Can u advice how I can trouble shoot and/or replacement parts?
I am a engineer and like to learn how to repair things occasionally, thanks and appreciate.

Fish

Answer
Hello!  I am sorry to hear the organ quit.  Very frustrating!  When troubleshooting any electronics, there is a standard sequence of events to follow.  The heart of any device is the power supply.  If the power supply's voltages are incorrect or missing, the rest of the organ cannot work.  

First, remove the back of the organ and do a visual check for damage to wires and boards from mice or other animals such as cats.  If the organ is very dusty, vacuum it to help visualize any broken wires or damaged components.  Because of what happens when the organ is turned off, it is possible a broken or loose common is present.

Check all connections. The contacts in the plugs have been sitting for many years.  Sometimes, resetting the plugs can solve many problems.   

Locate the power supply and check for blown fuses, input voltage and output voltages.  If DC voltages are present, turn your volt meter to AC and check the same output voltages for ripple.  If ripple is present, then consider a bad electrolytic filter cap or bad rectifier diode.

Electrolytic capacitors are notorious for going bad in organs of this age.  Check that none are running warm, leaking or deformed.  

Without further information, this is the best I can do to help you.  I wish you success!  

Piano, Organ, and Keyboard

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Thomas Britanyak

Expertise

I am a full time organ/piano technician who has been actively involved with the design, building, repair, maintenance and installation of organs and pianos for 35 years. I began as a keyboard instrument apprentice and hold degrees in music and electronics. If you need a piano's date of manufacture, please go to http://www.pianoexchange.com/howold.htm or http://www.bluebookofpianos.com/pianoage.html I am happy to answer musical or technical questions, however, I CANNOT offer appraisals on pianos or organs. Please do not ask what an instrument is worth. For this service please contact an experienced local appraiser or try the following links: https://mmm1100.verio-web.com/blueb1/appraisal.html or http://www.57piano.com/questions.htm

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I am a full time organ/piano technician who has been actively involved with the design, building, repair, maintenance and installation of organs and pianos for 35 years. I began as a keyboard instrument apprentice and hold degrees in music and electronics.

Education/Credentials
I am a full time organ/piano technician who has been actively involved with the design, building, repair, maintenance and installation of organs and pianos for 35 years. I began as a keyboard instrument apprentice and hold degrees in music and electronics.

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