hifi engine

Sansui AU-3300

Hi everybody,
I am actually working in Nigeria and I found in a market an Au-3300 of Sansui.
I realized is difficult to find schematics and manuals.
Anybody can help me?
In case is not possible to find, which is the Sansui model more similar to the AU-3300?
Thank you

I received a feedback by a Sansui expert

This gentleman suggested that the AU-3300 is practically the AU-4900.
I can confirm that.
There are minimal differences in circuit board and cosmetics.
Nothing of relevant as I could understand.

kind regards to all