Lexmark 4090-001 - Manual (Page 53)

Repair Information 4-21
4090-001
Small Feed Roll Shaft, Rollers & Paper Flap Removal
1. Remove the front cover.
2. Remove the rear cover.
3. Remove the carrier frame assembly.
4. Spread the left and right side frames apart far enough to
remove the small feed roll shaft assembly.
Boss Paper Guide Feature
Due to occasional paper buckling at the bottom edge of the page, a
new feature has been added to the paper guide to stabilize the small
feed roll shaft. Install the new style paper guide and match the small
feed roll assembly. The new small feed roll FRU is cut out in the
paper flap allowing the new feature to contact the small feed roll
shaft.
Star Roller Removal
1. Remove the front cover.
2. Remove the two screws from the star roller assembly and
remove the assembly.
System Board Removal
1. Remove the front cover.
2. Unlock the two printhead cable connectors and disconnect the
printhead cables from the system board.
3. Disconnect the other cables from the system board.
4. Gently release the tension on the encoder strip by flexing the
encoder strip tensioner and remove the encoder strip from the
left side only.
5. Remove the three screws securing the system board to the
carrier frame and remove the system board. Note the routing of
the paper feed motor cable.
Note: The head to head and bidirectional printing alignments will be
reset to factory defaults. The user, through the Printer Control
program, is directed to perform these alignments. When reinstalling
the system board, it is easier to insert the printhead cables in the two
connectors prior to installing the board.