You can find Instruction Manuals of Asia and International models here:

https://www.intl.onkyo.com/downloads/manuals/index.html


For USA models, please visit Onkyo USA website:

https://www.onkyousa.com/Downloads/manuals.php


For Europe models, please visit Onkyo Europe website:

https://www.eu.onkyo.com/en/downloads-390.html


If you still cannot find the user manual of your unit, please contact the local distributor in your country:

https://www.intl.onkyo.com/support/local_support/index.html