Piano, Organ, and Keyboard/Intermittent power issue Lowrey

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Question
Hi Thomas,

Our church organ...Lowrey Heritage
Serial # 400C 109D1 61892        

Occasionally the organ fails to play at start up.
All the lights come on but no sound.
Sometimes we leave it on and try 10-15 minutes later...
on one out of three occasions it begins working.  
We've had it worked on to no avail.  Hoping your expertise
will lead us to diagnosis and repair.
Thank you. Claude Grant..Michigan

Answer
Hello Claude!  The heart of any electronics is the power supply.  If it does not work correctly, problems will continue to exist until the power supply problem is corrected.  Once we know the power supply is performing properly, further troubleshooting can occur, but not before.

I have very little information to go on here.  You say the organ has been worked on.  What information did the service person provide about the problem?  When the sound disappears, can you hear the organ through headphones?  Is there hum present?  

The mute circuit is a common problem in audio electronics.  It keeps the amplifiers off until after the sound generation system turns on.  This assures a silent turn-on. Anything preventing the mute circuit from operating correctly can result in a silent instrument.  

Other causes such as bad connections can usually be found by turning the organ on, turning on some speaking stops, holding down a key and start gently prodding around inside the console until the sound suddenly appears.  When this happens, you've found the bad connection. Experience would be helpful here, but nothing ventured, nothing gained.

Lastly, look for foil candy wrappers, metal paper clips, pencils and any other obvious foreign matter inside the organ.  Instruments with roll-tops are notorious for this problem. If you do find something, make certain to turn the organ off before attempting to remove the object.  

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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