Oki T400 User Manual page 52

Installing the Dispenser Kit
Thermal Transfer Unit:
STEP PROCEDURE
The Ribbon Assembly on the Thermal Transfer Unit has a gear that meshes
with the gear on the Platen Roller Assembly and must be disengaged to
allow the Platen Roller Assembly to be removed.
1. Switch the printer OFF and disconnect the power cord.
2. Raise the top cover and print head assembly.
3. Remove the front door panel.
4. Refer to the illustrations on the following pages.
Remove screw to detach lever from Print Head and Ribbon Assembly.
5. Gently lift tab on the bracket either by inserting a flat blade screwdriver
under the tab or other means and pulling outward on the bracket to
disengage positioning pin on the back side of the lever. Positioning pin fits
into hole on the print head.
6. Grab the Ribbon Assembly and slide backward to disengage the opposite
end from the print head. Note that the ribbon assembly has a connector
which is connected to a cable from the printer. Be sure to reconnect if it
becomes disengaged.
7. Raise the tear bar to the upright position to unlock the Platen Roller
Assembly.
8. Gently lift the right side of the platen from the support yoke, then maneuver
the geared left side to free from the opposite support yoke.
9. Note the position of the components. The new Dispenser Plate will replace
the existing Tear Bar on the Platen Roller Assembly.
Detach "C" rings from both ends of the platen and slide off the gear and
bearings. Remove the existing tear bar.
10. Install the dispenser plate in the same location as the tear bar. Replace
bearings and gear and reattach "C" rings.
11. Install the altered platen assembly back into the printer. Reinstall the Ribbon
Assembly by reversing Steps 6-4.
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