Question about Yamaha DGX630 - Digital Piano
I have a Yamana DGX 630 and after the kids played with the piano, I noticed that many of the E keys make a strange sound like two notes played together or something... tried reset but didn't work. Are there any suggestions
Perhaps the performance assistant technology is turned on.
Press the [PERFORMANCE ASSISTANT] button to turn it off.
Posted on Jan 14, 2013
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Posted on Jan 02, 2017
White spirit is NOT what you should use. Mineral spirit leaves a residue film.
Use 99% isoprophyl alcohol.
ALSO inspect the contactboard for cracks by candeling with bright light behind it.
Posted on Nov 01, 2009
Testimonial: "bur isnt it strange that certain keys have stopped working? ie most the A keys"
Either the first or second closure matrix line for the "A" keys is bad.
This may be a cracked or shorted circuit board.
A bank of diodes is used to prevent sneak electrical path if more than one octave has notes pressed.
First thing is to clean ALL the key contact areas and the conductive rubber pills with 99% isoprophyl alcohol.
This involves dis-assembly of the key area. If you are not competent in electronics, best left to a pro shop.
The keys are scanned in a matrix, two contacts per key and all the individual notes are in common (all the "A;s", "B's"...) And each octave is strobed for the first set of contacts and then for the second set of contacts. an the whole octave is read in parallel.
The reason for two contacts is one closes first and then the other as a key is lowered. The time between these is measured and is the note VELOCITY which for a piano controls the loadness of the note. IF ONE of the two fail, the loudness will vary as yours does.
Posted on Nov 27, 2009
SOURCE: the keys in the middle
Although the keys have a weighted feel, this is not because of a system involving connection t hammers as in an acoustic piano. This is done mechanically, however, which would indicate a need for cleaning. If you have an authorized Yamaha service center in you area they would need to do the cleaning.
Posted on Oct 31, 2010
SOURCE: I'm using the Yamaha P-85
In playing fast you have to make sure to release the note fully and let the key come up. These keys have TWO contacts that are used in the scheme to measure note velocity. If BOTH contacts don't open, the note will NOT re-fire. The second symptom you have written would be a characteristic if one of the disconnect diodes has shorted. These diodes direct the strobe signals that scan the matrix of key contacts to avoid other octaves responding when multiple keys are depressed including those in other octaves. Servicing of the unit is required. It is unlikely you have the tools to DIY this problem. ONE THING to try is to tip the unit and gently tap it to see if some debris MIGHT have fallen in that may be shorting some of the matrix connections.
Posted on Apr 25, 2011
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