IBM 3000 manual Developer Drain Lever B downward and then pushing it

11.	When the developer stops running, close the developer drain by pushing the
	Developer Drain Lever B downward and then pushing it in.
12.	Once the developer mix has ®nished draining, ensure that no developer mix
	remains in the drain hose. Do this by shaking the hose vigorously while you
	hold the hose as vertical as possible.
13.	Remove the developer drain hose from the bottle. Put the cap on the
	developer drain hose, and return the hose to its recessed storage area.
14.	Put the cap on the bottle. Discard the bottle and its contents.

Attention!

To prevent print quality problems, never reuse waste developer mix. Never put anything other than new developer mix into the developer mix inlet.

15.Remove the cap from the new developer mix bottle.

16.Remove the developer inlet cover.

Chapter 7. Ordering and Replacing Supplies 197