Got the color ribbon working on the ex800 self test:

There's a stepper motor for the color ribbon positioner that moves the ribbon up and down along with a switch to tell you when you're at the home position.

The stepper position goes from 0 to 70 to 142 to 216 so just divide by 70 to get an index for the ribbon color.


[Linked Image from i.imgur.com]

[Linked Image from i.imgur.com]