是501-1吧，是分页器通讯故障，连接线，细缆很便宜的几十元。再有就是分页器电源坏了。
Code Detail code Description Remedial action
E501 0001 finisher communication fault
Data communication has failed even
after 3 retries.
- Check the connectors of the finisher controller PCB
and the DC controller PCB.
- Replace the finisher controller PCB.
- Replace the DC controller PCB.
E503 0003 professional puncher communication error
Communication between finisher and
professional puncher is not possible.
- Check the connectors of the finisher