You are here:

Piano, Organ, and Keyboard/non-functioning key on electronic keyboard

Advertisement


Question
Our church uses an 88-key Technics electronic keyboard.  It is several years old.  Recently, the F above middle C started to work only intermittently; when it does work, it is much louder than the volume of the rest of the keys - scaring the pianist and congregation.  Now, it also plays repeatedly - although very quietly - when no one is playing the piano.  It has to be turned off in between songs, or the sound is very distracting.  We vacuumed the inner workings, hoping it was just a dusty connection - to no avail.  Our pastor is suggesting it is humidity, but we are doubtful as it's only one key, and always the same key.  Any suggestions?

Answer
Hello Susan!  There are several possibilities that could cause this problem.  The key works via a timing circuit which measures the speed at which a key is depressed.  The faster you press down on a key the louder the key plays.  The problem could be some foreign material that has lodged beneath the key or perhaps a loose ribbon cable connecting the keyboard to the CPU.  But if this were the case I'd expect more keys to be affected.  Therefore, the more likely cause is a problem with the keying circuit at the key itself.  It could be a bad diode, bad actuator or bad sensors.  Does the key depress farther down than the others?  Is the key as level as the other keys?  When you gently depress the key does the travel feel different than the other keys?  Does the key make any slight noise when it is depressed?  These questions would be helpful, but in any case would still require the keyboard be disassembled and visually checked for problems.  After that, the electronic components would have to be evaluated.  I suggest you contact http://mitatechs.org/service-locator to obtain a Technics service person in your area.  Make certain before engaging anyone's services you determine whether they are trained to work on Technic's equipment!  

Piano, Organ, and Keyboard

All Answers


Answers by Expert:


Ask Experts

Volunteer


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

Experience

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.

©2016 About.com. All rights reserved.