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Yamaha YDP223 Digital Piano - Page 9 Questions & Answers
Yamaha mo6 keys stopped working. All except the G's and Db's. Was in Voice mode and it literally did that while I was playing. Tried a factory reset already.
The fact that ALL keys except G's and D flats are not working, points to a possible matrix or multiplexing problem.
As shown in the simplified schematic, if any traces (PCB tracks) from the mutiplexer / controller IC are broken, eg if the board has a crack, this could disable all identical notes for all octaves.
Otherwise the controller itself may have a fault.
(Some non-related info):
In reality, the synth's matrix is a bit more complicated than the basic sketch shown for explanation.
Diodes are included per key to prevent 'phantom note playing' and to isolate keys.
Velocity-sensing uses two set of contacts to sense timing from A to B contacts when key is struck.
7/20/2018 2:02:00 AM •
Yamaha Music
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Answered
on Jul 20, 2018
How can i reset my yamaha dgx 230 ??
Hi
The normal reset is to hold down the highest note ( furtherst white key to the right ) at the same time as turning the instrument on. This will initiate a factory reset.
7/11/2018 2:09:50 PM •
Yamaha Music
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Answered
on Jul 11, 2018
Where are the fuse in yamaha
YDP 141
Firstly determine that the power supply you are using is providing the correct voltage, check with a multimeter.
If it is correct then you need to open the piano. Look inside where the power plugs in check the little black socket and ensure that there are no breaks where this is soldered to the circuit board - very common problem. If so resolder or replace socket. Does turning the switch on make the red light come on - if not and socket is soldered correctly - suspect the switch - check continuity wilth multimeter, if switch is ok check voltage across pins 1 & 5 on CN2 on board this should read around 12v. if this doesnt show a voltage it is easier just to replace the whole DCIN board # WM227400
7/11/2018 2:06:40 PM •
Yamaha Music
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Answered
on Jul 11, 2018
I have a yamaha p-155 88 key digital piano the upper octave has no sound
Try local Yamaha dealer. They may not make house calls, few people these days do.What you might try if you are up to the challenge is flip the keyboard over- unplug it. remove the screws that hold the top and bottom shells together- do not let weight of unit rest on keys, especially when opening it up.Look for physical damage to the keyboard action in the vicinity of the nonfunctional section. Check for broken printed circuit board. If you see any cracks, see where it ends and drill a small hole at the end of the crack to halt propagation. clean the varnish off the circuit tracks and tin the broken tracks first on either side of the break then bridge them with solder. Use a modest sized soldering iron and small diameter (rosin core only) solder. If there are any broken wire connections, resolder them. This may require part of the action to be removed from case- take pictures first before proceeding- make sure they show exactly where the connectors are and what wires are present. etc. You want to be able to refer to the pictures in the event you forget details of disassembly.If nothing looks out of place, look for solder joints that do not appear to have flown out nicely- reflow them adding a little solder.
3/2/2018 6:28:24 PM •
Yamaha Music
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Answered
on Mar 02, 2018
Clavinova CLP-360 missing Part G Screw Set (page 1 after the Contents of Owners Manual)
First of all they are metric fasteners. The best thing to do is measure the diameter of the hole with a metric of English ruler, then measure the depth of it with something skinny Using that info go to a hardware store and look for a fastener that fits the description. There are going to be different thread sizes. Get one of each and try them out to see what is the right one.
12/14/2017 11:48:51 PM •
Yamaha Music
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Answered
on Dec 14, 2017
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