Samsung CLX-8640 series Service Manual page 350

4. Troubleshooting
f) Replace the Finisher main control board(JC81–07242A).
4) Is the Feed Entrance Motor (M1) working?
a) Check if the connector(JR10 8320) of the Feed entrance motor is disconnected.
b) Check if the connector(JR10 8320) J5 on the Finisher main board(JC81–07242A) is disconnected.
c) Check for continuity in the wire harness and whether the harness is damaged(JR10 8320), replace it if required.
d) Replace the Feed entrance motor(M1).
e) Replace the Finisher main control board(JC81–07242A).
5) Check if there is any object on finisher paper path. Remove it if there is.
4-191 Copyright© 1995-2013 SAMSUNG. All rights reserved.