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HQRP AC Adapter / Power Supply for Yamaha PSR-280 / PSR280 / PSR-290 / PSR290 Keyboards Replacement plus HQRP Coaster, 600 related issues. ... is there an internal battery to protect memory and if so, do i need to replace it? yes there ...HQRP AC Adapter / Power Supply for Yamaha DGX-620 / DGX620 / DGX- ...
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HQRP AC Adapter / Power Supply for Yamaha PSR-280 / PSR280 / PSR-290 / PSR290 Keyboards Replacement plus HQRP Coaster, adapter related ... need a new one, you could try to get a replacement from casio or try to get an ... It MAY appear to operate on DC BUT it can't generate the +/- voltages internally for sound .
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What is your piano brand and type?
Damage to the contact rubber can cause note plays loudly or,
note does not plays at all. It is caused by: 1. Carbon rubber contacts dirty / dusty (yellow arrow). Clean with a pencil eraser (or cloth). Gently rub it.
2. Contact rubber is torn (your case). If this happen,it can not be repaired or glue. So, you have to replace one octave.
The yellow arrow indicates the side that is often torn.
Rubber side that is torn, usually not seen, unless we move / pressing gently on top (In the rubber contact position is not installed on the board.)
Examples of this picture was yamaha psr.
Hi I'm not sure I completely understand your problem but......it sounds like you might be in "Fingered On Bass" mode. This means if you play a chord like F using the notes FAC- if you play them in 2nd inversion (so the order is CFA) the psr-1000 will make the note "C" the bass note. In this mode if you played ACF then "A" would be in the bass part. Change to "Fingered Chord"-this will enable you to play any chord with the tonic (the name of the chord) F whether you play FAC, ACF or CFA in the bass part. I don't have access to a psr-1000 but often with Yamaha instruments this can be changed by pressing and holding the "Auto Accompaniment" button. I hope this helps. Musicwez
Hi, This is probably due to worn rubber contacts. The sound is switched by pressing a key which in turns press a carbon contact on the PCB under the key. In time these wear out and need to be replaced.
Firstly open up the keyboard and locate the rubber contacts, check to see if each one is seated squarely, if they are not seat straight then this can create the problem you mention.
If all are OK then you will need to replace the strip which is causing a problem.
Spares are available from many sources including :
Your adapter should be a 12 volt DC delivering 2 amps (2000 ma). If the adapter is too small, you will have the symptoms you are seeing. Make sure the polarity is correct. DO NOT use the so called "universal adapters".
Your key contacts have gotten dirty. Two contacts per key are used to sense velocity and if one doesn't work the sound will be full velocity and loud.
The contacts are conductive rubber "pills" in silicone rubber domes that the key presses down onto circuit board traces under the keys. Clean both the "pills" and the black portion of the circuit board GENTLY using ONLY 99% isoprophyl alcohol and QTips. There is a lot of disassembly required and one has to keep track of where the screws go and length and thread type to re-assemble after cleaning. Also great care must be taken to not damage the ribbon cablles connecting the top and bottom halves of the case.
The key contacts have gotten dirty. The contacts are CONDUCTIVE rubber pills that are pressed onto circuit traces on the circuit board under the keys. Onehas to dis-assemble the keyboard very carefully noting the size and location of all the screws and using great care of the cables that connect the top and bottom of the case.
when you remove the keys, you will find silicone rubber strips with the black pills underneath, two pills per key.
Clean these with ONLY 99% isoprophyl alcohol and Qtips as well as cleaning the circuit board traces they contact.
Carefully re-assemble the keyboard.
An answer, but likely not a solution. I believe all Yamaha PSR series keyboards use the same 12 VDC adaptor, so I looked at the electrical schematic for another model I have. There seems to be no fuse on the power input. There are two components shown on the positive and negative wires off the power socket, but the symbols do not look like anything I have seen for fuses - they may be resistors. Power goes directly to a 5 VDC voltage regulator, which powers all of the solid state componenents. Too much voltage of the wrong type could have easily ruined many of the sensitive components.
Your only hope is to check the power socket area for the possibility of having fuses. My drawing shows the power socket, voltage regulator, and audio power amplifier being on one circuit board. That may not actually be the way it is in your model.