20 Most Recent Roland BOSS RC-20XL Loop Station Phrase Recorder with Instrument Cables - Page 5 Questions & Answers

If the PSU is a switch mode type it is clearly faulty but if it is a transformer type checking it open circuit or off-load will usually result in a significantly higher voltage than specified. In order to check the latter type it is necessary to first apply a load approximately equivalent to the device it would be powering if the device was working normally. Sorry I can't answer the rest of your question...

Get the manual from web site and it will tell you how to replace the battery.

If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ Search the site by type in the "brand name" of your device, in the "Search box at the top right of the Homepage" to get gathered related posts.

You have a ground problem. I suspect your cord. Replace it, being sure you use an instrument cable, and see it that doesn't help.

Mine did that. Found out it was the input jacks

Open up the Roland E-80 and check if all connectors and flatcables are well seated.

Here you are- https://www.sweetwater.com/sweetcare/articles/roland-e-09-initializing-restoring-factory-settings

Sorry but not at this site. Try a local music store.

I suggest you contact /Roland directly. Here is the link- Roland Company Contact Us Contact Us

And what is your question about it? Most can be answered on the ROland site or from their customer support staff. Here is the link- Roland Company Contact Us Contact Us

If the polarity, voltage, and amperage are the same, there is no reason that you cannot use this device as an alternate.