Symptom
- Prints were made in staple mode but some sheets are not stapled.
Example: Two sheets were printed but only one sheet was stapled. - The first sheet was unexpectedly rotated clockwise while being pulled back, which causes the two sheets to be misaligned.
Cause
The bushing at the right end of the shift roller has been scraped, which makes it unable for the rollers to apply pressure, preventing the sheets from being transported to the staple tray correctly.
Solution
Replace the bushing.
- Remove the internal finisher. (Internal Finisher)
- Remove the finisher main board cover.
- Remove the finisher frames. (Finisher Frames)
Remove the finisher main board bracket [A].
Remove the finisher exit guide plate motor bracket [A].
Remove the gear [A] and bushing [B] from the right end of the exit open/close pawl.
Remove the bushing [A] from the left end of the exit open/close pawl.
Remove the spring [A] from the right end of the exit open/close pawl.
Remove the finisher top front cover [A].
Remove the exit open/close pawl [A] by sliding it to the left and then lifting it.
Lift the spring plate [B] to prevent it from being obstructed by the exit roller.
Remove the bushing [A] from the right end of the gathering roller.
Remove the clip ring [A] and slide the pulley [B] to the left.
Remove the gear [C] and bushing [D].
Remove the gathering roller [A] by sliding it to the left and then lifting it.
Remove the finisher entrance sensor bracket [A].
Remove the harness guide [A].
Remove three retaining rings [A] [B] [C].
Replace these retaining rings with new ones when reassembling the finisher.
Remove the stay [A].
Remove the finisher paper exit motor bracket [A].
Remove the finisher shift roller motor bracket [A].
Remove the gear [A] and bushing [B] from the shift roller.
Remove the shift roller [C].
Replace the bushing [A] with a new one.
Reassemble the machine.