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The DC power is no longer working on my Yamaha np30 and when using batteries there is a very low volume and the sound breaks up. Also when I unplug the headphones the power switches off when using batteries. Any ideas?
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Go to the menu and the settings, language & Keyboard Touch Input. Text Input under an other setting make sure that you have the sound feedback checked. If that is checked and its still not working try restarting your device. Sound feedback is checked; no sound for keyboard or menu/app selections.
When no sound is output even though the power is turned on, check the following points. Make sure that the master volume is not set too low. Set it to an appropriate level using the slider or knob. Make sure that nothing is connected to the headphone jack on the keyboard.
It sounds like a defective/incorrect AC-to-DC adapter may have caused your problem. These adapter come with different output voltages, AC or DC output and different amperage ratings. AC-to-DC adapters list the polarity of the DC voltage as it relates to the DC power plug and you must match both the devices voltage and power requirements. As for the amp...not working on batteries either, I would suspect output transistors or IC.
My Yamaha P85 had a no sound problem too. I replaced the two 100uf capacitors at locations C216 and C217 on the board where the DC power plug connects. Fixed it right up.
I'm having the problem too...I'm thinking that maybe getting the DC adapter MAY fix it though as stated in the Manual: "...The output level of the mini-KP will be smaller than its input level. This is because the attenuator circuit is connected at the input section, considering that the mini-KP is used on battery power." so maybe the dc connector will increase output volume?
The distorted and low volume output plus noise is usually caused by using the wrong power supply adapter. The Alesis SR-16 takes a 9V "A/C" supply not "DC". The A/C supply provides a negative voltage swing which wouldn't exist with a DC supply. So check and make sure you have 9V A/C output supply not DC.
go back in and find where the electrolitic capacitors connect to the board. They look kind of like a battery. One or both of them have broken loose from the main board, preventing any significant current from going to the output transformer, and causing overload. This is a common problem, and it does not take much rough handling to cause it.
where the break is is at the solder connection. Under a magnifying glass, the break will look like a little circle. Float fresh solder on that or any other large solder joints which may be cracked or broken.
Use standard precautions when working around high voltage.
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