I opened the scanner and wrote down chipsets.
On the inside of the scanner I found out the following chips:
TDK TAD737 EA02737T
most of other hardware is based on chips from I-SOLUTION LTD
on MAINBOARD there are following chips (also from I-SOLUTION; as it says
on chips):
ESMT : M12L1616A 7T
LZG1P216Q 0243
and
L6219DS (it only says "KOREA" on this chip)
Thank you!