The Service Manual was just as expected, complete with schematics and I was able to download it in less than an hour after I ordered it. The only problem with these is that the schematics are hard to read due to the small font. I could remedy this by printing them on a larger printer.
Payments were processed quickly and items were exactly as described. I will use owner-manuals.com in the future for any other manual needs.
Text excerpt from page 154 (click to view)
12 February 1992
11. Push the development unit lock lever [A] to the right (to the lock position). 12. 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. 13. Separate the toner supply unit from the development unit (3 screws). 14. 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. 15. Remount the toner supply unit on the development unit.