5 stars on this manual since it is the complete version, not the half manual you find free for download all over the web. Good job.
Text excerpt from page 19 (click to view)
10 July 1992
10. Push the development unit lock lever [A] to the right (to the lock position). 11. Move the development release lever [B] to the right and pull out the black development unit [C] half way. Holding the toner supply unit [D] with your right hand and the bottom of the development unit with your left hand, pull the unit all the way out . Place the unit on a clean sheet of paper. 12. Separate the toner supply unit from the development unit (3 screws). 13. Pour one pack of black developer [E] into the development unit while turning the development roller knob [F] counterclockwise. This will distribute the developer inside the unit. 14. Remount the toner supply unit on the development unit.