Unfortunately, I do not have a user's manual for the Autoreflex A3 which I could scan and provide for download.
There is a user's manual for the Autoreflex A3 in English language only on Mike Butkus' site at the following URL: http://butkus.org/chinon/konica_a3/konica_a3-splash.htm.
The Autoreflex A3 is based on the Autoreflex T3 and is in many aspects very similar to this body. The Autoreflex A3 lacks a lot of features the Autoreflex T3 provides (see list on the Autoreflex A3 main page), but all the other controls, functions and features are identical.
Therefore, if you have questions about the operation of your Autoreflex A3, a look at the multilingual user's manual for the Autoreflex T3 will certainly be helpful.