Оригинальный сообщение: jayeff ,
Hi, You mentioned that there is a ''buzzing'' sound at times. Here is an image of the power amp circuit taken from the service manual (see link below) that shows that there is a relay in the audio output stage. I'm wondering if the relay is making the buzzing sound. If it is not then you may have to start testing to see where the audio is being lost. It may be easier to start at the audio output and work back into the amp section Hopefully it is in the Power Amp board and not back in the digital to analogue converter section. [image|1375179] (click on image to enlarge for better viewing) Here is a link to the [https://data2.manualslib.com/pdf4/84/8303/830267-casio/cz5000.pdf?a4f216c4ab35c59ff4034735fd22c6d5|service manual] for your keyboard.