IBM INFO PRINT 3000 - Manual (Page 123)

Important Note About the Coronas
There is no device to prevent you from pulling out the corona wires. Be
careful not to break the thin wires and tiny retractor springs inside the
corona.
a.
Pull each white corona toward you until it is almost out of its track. A
brush inside the corona housing cleans the corona as you pull it out and
then push it back in.
b. Gently push each corona back into place. Ensure that you have pushed the
corona in completely.
11. Use a cloth or paper towel to wipe away any paper dust, toner, or other
debris from the developer area.
12. Close the front center right cover of the printer.
Important
The front center right cover must be completely closed whenever the
printer is running. Light entering the printer can significantly reduce
print quality.
Chapter 6. Operator Responsibilities
91