Printronix SL4M - Manual (Page 23)

Loading Ribbon
23
5. Thread the end of the ribbon under the ribbon guide rollers, between the
platen (rubber drive roller) and the printhead, and between the ribbon
take-up and supply spindles.
NOTE: Make sure to thread the ribbon behind the ribbon take-up spindle.
NOTE: The alternate ribbon path is for inside ink ribbon.
Printhead
Ribbon Guide
Roller (2)
Ribbon
Ribbon
Supply Spindle
Ribbon
Take-Up Spindle
Ribbon Take-Up
Core
Alternate Ribbon
Path
Platen (not shown)