Question about Office Equipment & Supplies
Loved my PC88 until 1 note became loud. Thinking this was a contact problem, I carefully cleaned them. I reinserted them in the correct order. Now I have 8 dead notes - starting at Middle C# up to G#. I then bought a new contact strip and replaced the middle C octave. Still no change. (Oddly, middle C and the last 3 notes of the octave - A, A#,and B do work) What would cause 8 notes within the octave to suddenly stop working? Would appreciate any help you can give me
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Posted on Jan 02, 2017
If this is the kind of organ with the wire sticking out of the key that makes contact with the bus bar to create the note you will have to make sure that key is operating the same as adjacent keys. The busbars have to be clean and the contact wires have to be clean. Sometimes when cleaning the wires they will spring out of place and not make contact with the appropriate bus bars. Check that key against the rest and see what you find. Hope this helps.
Posted on May 23, 2009
SOURCE: My Casio WK-3000 works perfectly
You will have to have someone open up the keyboard and check that the flex-cables from the keys are all connected to the main circuit board
Posted on Aug 17, 2010
SOURCE: Yamaha PSR 530: D, F#, G
The key contacts which are conductive rubber are dirty.
You need to disassemble to access the silicone rubber domes with the conductive rubber "pills". Carefully clean these pills using a QTip and ONLY 99% isoprophyl alcohol. Also carefully clean the circuit board where these contact.
Posted on Sep 22, 2010
Thisis hard to troubleshoot... The keyboard insynths are usually scanned as a matrix... If a disconnect diode has failed, then wrong notes can be triggered. There is USUALLY rows of the diodes on the circuit board where the keys hit. There are usually TWO contacts per key in order to sense key velocity. The lkey contacts are usually conductive rubber pills pressed against circuit traces under the keys. One sometimes needs to clean these contacts using 99% isoprophyl alcohol and Q tips.
I would do further testing of ALL combinations of notes played together to see if possibly any others show up as that could point to a particular failure.
Posted on Oct 27, 2010
SOURCE: The "G" note below Middle
The key contact has gotten contaminated. They are a black conductive rubber pill pressed against circuit traces on a board bellow the keys. Remove that key and maybe others to get at the contacts in silicone strips. Clean ONLY with 99% isoprophyl alcohol and Q tips. Clean both the pills (two per note) and the circuit traces they touch. You have to release the spring at the back of each key to remove the key.
Posted on Feb 03, 2011
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