Xerox 4635 Operator's Manual page 249

MAINTENANCE TASKS
9. Replace the reservoir cap by turning it clockwise.
10. Push the fuser agent reservoir in until it stops.
11. Push the fuser drawer in until it latches in place.
Figure 11-13. Closing the fuser drawer
12. Close the printer doors.
Note: The fuser agent message disappears after the LPS prints
between 32 and 40 sheets. Since the sheets must be processed
continuously, you may want to run 45 test pages in order to clear
the message from the system (unless the current print job
contains at least 40 pages).
XEROX 4635 LASER PRINTING SYSTEM OPERATOR GUIDE 11-9