Samsung CLX-8640 series Service Manual page 352

4. Troubleshooting
b) Check if the connector(SJ10 8340) of the Finisher Exit sensor(S3) is disconnected.
c) Check if the connector(JR10 8320) J7 on the Finisher main board(JC81–07242A) is disconnected.
d) Check for continuity in the wire harness and whether the harness is damaged(JR10 8320, SJ10 8340), replace it
if required.
e) Replace the Finisher exit sensor(S3,S11).
f) Replace the Finisher main control board(JC81–07242A).
4) Is the Feed Exit Motor(M2) working?
a) Check if the connector(JR10 8320) of the Feed exit motor is disconnected.
b) Check if the connector 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 exit motor(M2).
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.
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