Question about Roland Music
Few keys sounds loud when depressed
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Posted on Jan 02, 2017
Probably the best thing to do is call the Yamaha service center nearest you. I live in the Los Angeles area, and the Yamaha service center closest to me is in Buena Park. I called them on the phone and told them what the problem was, and they knew immediately what parts were needed and they shipped them out that same day.
The contacts that seem to wear out the fastest are the ones near the middle of the keyboard. On my CLP-170, it's the keys between middle C and the G above that -- probably no more then 4 or 5 keys. However, I ordered replacement contacts for all 88 keys because once you take the piano apart to replace the contacts, you may as well replace all of them.
Good luck, Howard
Posted on Sep 29, 2008
I am sure it can be fixed. Who knows what brand or type of instrument this is...
The stuck keys are probably mechanical sticking. The loud keys are probably dirty key contacts that sense velocity.
Take unit in for servicing.
Posted on Jan 25, 2010
In Casio Chord mode, the bottom keys up to the second F plays Bass Chords. The Keyboard is just putting the keys you play back into bass when you get up that high. If you read along the plastic edge above where they keys come out of the keyboard, it shows you where the Chord keys end and the Keyboard begins. If you want use of all the Octaves, slide the power switch to the first setting (normal).
Posted on Feb 17, 2010
The wire from pin 1 or 7 of CN1 on the GHL88L (left end) circuit board is open where it goes to the middle circuit board. This could be a bad cable, improperly seated cable connector, or a crack in the circuit board(s) connecting to these wires. These are the common matrix wires associated with only the C# and G keys for the left 1/3 of the keys. If more than 1/3 is dead, then the problem is likely on the middle board GHL88M that connects to the mating cable to the CN1 connector.
There are two wires dedicated to the keys for the two contacts that are used to measure velocity of the key strokes. There is a mechanical position between closing the contacts and the time is measured by the processor as velocity.
If you are the least bit worried about working on electronics you best have a service person do the repair. The keyboard has to be lifted out after removing the top and disconnecting other cables.
Posted on May 03, 2010
SOURCE: all c keys and all
The key scanning matrix cable/circuitry has lost two of the connections. Could be either a loose cable or worst case a cracked circuit board under the keys.
Posted on Aug 26, 2011
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