There are two different models of the Aspire 1690 Series available, with different drivers and BIOS revisions. Please choose the correct model for driver download.
The easiest way to identify an Aspire 1690 DDR or DDR 2 is the bar code on the bottom side of the units.
The 3rd, 4th and 5th digits of the S/N stands for the model code as following:
LXA43, LXA44, LXA53, LXA54 is an Aspire 1690 DDR series
LXA65, LXA 66, LXA72, LXA84 is an Aspire 1690 DDR2 series