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After each note there is a buzz

MK-928 Electronic Keyboard - after each note there is a buzz

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  • ron_harris May 10, 2009

    Thank you for your prompt reply.



    Yes, there is a buzz when playing the demo tune.





    Ron Harris

  • Michial Gueffroy May 11, 2010

    Is the buzz there when you play a demo tune?

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There is a possibility that your speakers either one or both are becoming faulty. Try going out of the outputs into an amplifier and speakers that is known by you to have clean sound and see what happens. Also if there is a headphone out on your keyboards; is the buzz still there?

Posted on May 10, 2009

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Keyboard user manual


http://www.novationmusic.com/support/downloads/

They do not list the MK 928 as such, but that does not mean it is not listed by another name.

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Oh, oh... that is often called the "Dreaded MIDI Drone".

There ccan be more than one causes, however two of those are this:

1. The receiving device either does or does not respond to the note off command or only responds to the note on command with zero velocity, which is also now interpreted as note off. Check the MIDI implementation chart to determine this.

2. Two MIDI commands have merged without using a MIDI merger which makes sure ONLY complete MIDI commands are sent. If the commands are mixed, dreaded MIDI drone is assured.

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You can use this keyboard via MIDI to send note on/off information to FriutyLoops. Use for control functions will be somewhat limited to voice change, velocity, and aftertouch.

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Hi, I've had a mk 928 keyboard for my son, and he's somehow banged the mains lead, where it goes into the back of the keyboard. The keyboard only comes on now if you hold the cable in the back. I've taken...


The connector for the power on the circuit board has broken the solder connections OR cracked the board in the area.

Resolder the connector and if you see cracks that are breaking circuit traces on the board, one bridges around them with wires to repair.

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Casio Privia keyboard PX-100


There are a number of issues that could cause this, the most likely culprit is the power supply, when I say power supply I mean the internal power supply, 
This means that you have already obtained a good "known to work" AC to DC power supply, and tested it on your keyboard to see if that is the problem. 
If you have completed this step, then your next step is to test your unit with batteries only, if the keyboard works, then you know your problem, is internal to the keyboard. 
There are two issues to check, before proceeding please read the following note.
 (a note here for those who have no experience working with internal electronics)
If you have no experience working with internal electronics I would not recommend, opening your keyboard. 
Two reasons, one, will void warranty if it still is under warranty. 
secondly, you could accidently cause more damage to the unit. 
Now if you are still reading, and feeling confident, you know that as a child you have dissembled many many electronic devices, just to see how they work. 
If you do decide to open the box, disconnect the power supply to the unit including any batteries. 
open the box and locate the power on button, clean using a Dielectric cleaning agent, can be obtained at most electronic specialty stores. 
clean the power button, may work but doubtful, usually the switch itself is usually bad, there is a way to test the switch, however, that is beyond the scope of this answer, if you are following this you will most likely have the knowledge to do this. 
The second and more challenging issue will be the internal power supply to the keyboard, or the interface that connects to your ac to dc converter. 
This can be much more trickier, and I wont go into it here. 
If you test your power switch determine that it is good then you should consider getting the unit serviced by a technician. 
If you examine the boards, (electronic circuit boards,) and notice burned, connections, (darker than other circuits) then most likely it will not be worth trying to fix. 
Hope this helps somewhat, if nothing else, take this print out to your local service dealer, and that will help in getting your keyboard repaired, 
Delete this part, before taking this to your dealer, 
Most electronic products can be easily fixed with a power switch, or power supply, however, many dealers will not tell you this and give you an estimate of fixing the unit that far exceeds the actual cost of repair, 
an example, in a local TV repair shop, a friend brought in a wide screen Plasma HD TV, quoted repair, $654.00  problem, 
power supply, actual cost, $75.00 my friend ordered the part online and with the help of a friend installed the new power supply returning his unit to full functionality. 
So beware, 

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