Question about Office Equipment & Supplies
Could use some more information, like make, model, operating system (XP, Vista, Windows 7) but try this:
Go into Control Panel-look for Sounds and Audio Devices; open the applet, disable the microphone or any type of audio boost.
Posted on Feb 03, 2010
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Posted on Jan 02, 2017
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Sounds like you have a poor or open ground if the loud noise is 50 or 60 Hertz. If you have the loud noise when the keyboard not connected then the open ground is in the amp. Often times it is only a cold or bad solder connection which you can touch up with a solder iron and some rosin core solder. If the noise disappears when the keyboard is not connected then I would look at the patch cord first and the connectors second. If you have a second amp you can test to cord and keyboard to verify the problem is the keyboard. If you have to touch up the solder connections, unplug and open up the unit. Make sure all connectors or seated and none of them are loose. Use a grounded three prong solder iron and 60/40 rosin core solder. Heat up connections on the connector and add a small bit of solder to each connection. Next heat up the solder connections on the circuit board and quickly add some solder. Caution, do not apply to much heat on the circuit board or the copper trace will lift off the board so you need to use as little heat as possible just to start the solder to flow then let it cool.
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