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Piano, Organ, and Keyboard/Baldwin overture fun machine - random key outages

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Question
Hello Thomas, we love our baldwin organ and hope to get it back to full playing capacity.  When we first turn it on, everything is fine.  Shortly thereafter, keys stop playing randomly D, E, F, G, in no particular order, same key in all octaves, one at a time.  We brought the organ overseas in a container so maybe something came loose during the transit.  Please help.  Thank you very much!!

Answer
Hello Susan!  Understanding how the organ works is the key to troubleshooting this instrument.  This is a divider organ which likely uses a TOS IC to generate all the top octave pitches of the organ. When notes begin to fade, check to see whether pitches are present in the highest octave of the organ. If you find pitches missing, then the TOS IC is going bad. This can be due to a loss of voltage regulation that feeds the IC or the IC is just going bad. In which case, it will need to be replaced.

If, on the other hand, all the top octave pitches are present while lower pitches are missing, the divider IC's are at fault. This can be due to the same problems the TOS IC might have.

I suggest not using the organ until an knowledgeable technician can determine the status of the voltages in the instrument. Because the notes initially work, there may be a chance to save the IC's by getting the power supply voltages under control. Most of Europe and the Middle East uses 220 volts at 50 cycles which may be contributing to the problem so make certain at the very least the voltage feeding the organ is correct.  

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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