Boss rc 30 owners manual - Boss Music

https://www.youtube.com/watch?v=SOWO8wUpqvE

on there site :)
https://www.manualslib.com/manual/927686/Boss-Rc-3.html

I would suggest cleaning the input jack, and if that doesn't fix it, replacing the jack.

Its described in the manual https://www.manualslib.com/manual/514807/Boss-Rc-50.html?page=83

That will be a power supply problem.

If your Roland BOSS RC-20XL Loop Station will not record or play, there are a few troubleshooting steps you can try:

1. Check the power source: Make sure that the Loop Station is properly powered and that the batteries or power supply are providing sufficient power. If using batteries, try replacing them with fresh ones.
2. Check the connections: Ensure that the input and output connections are properly connected and that there are no loose cables. Try using different cables to see if that resolves the issue.
3. Check the settings: Make sure that the Loop Station is set to the correct mode and that the input level is set appropriately. Refer to the user manual for guidance.
4. Reset the device: Try resetting the Loop Station to its factory settings. Refer to the user manual for instructions on how to do this.
5. Service: If none of the above steps work, the Loop Station may need to be serviced. Contact the manufacturer or a certified repair center for assistance.

Hopefully one of these steps will help you get your Roland BOSS RC-20XL Loop Station working again.

The Boss RC50 is intended for guitar level signal. Your computer takes line-level. Hence your effects are "down in the noise' and you don't hear them.

CHeck the voltage out of the adapter. It should be around 9 to 11 volts. If it is not, it is possible that the OC3 has reversed polarity AND a protector that put a short on an incorrect supply. If so, it could have damaged the RC50 adapter. If the RC50 adapter is putting out correct voltage, then I suspect the inout connector on the RC50 may be damaged or not quite seated. Visually inspect the connector first.

Did you look here under support:http://www.bossus.com/gear/productdetails.php?ProductId=772# Also there is an update available under downloads. The Preset Protect function protects factory patches at locations 1-5 from being overwritten. It is shipped with the demo audio saved there and the preset protect enabled. Here is the manual for creating patches:http://cms.rolandus.com/assets/media/pdf/RC50WS03.pdf The rest of the manuals are under support. The manuals have hot links to each other for various subjects. You can reach their product support dept. by phone or email. There is a knowlege base with answers to questions about problems other owners have:http://www.bossus.com/gear/productdetails.php?ProductId=772#