C3400n User’s Guide
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drive gear into the gear inside the printer by the rear left corner
of the unit, and lower the belt unit flat inside the printer.
belt_roll in _ F5_09.jpg
8. Turn the two fasteners (1) 90° to the right until they lock. This
will secure the belt unit in place.
belt_lock_F5_09_1.jpg
9. Replace the 4 image drums, complete with their toner cartridges,
into the printer in the correct positions as shown.