Duplex Unit Service Check - Lexmark T520 Service Manual

Infoprint 1120 and 1125

Duplex Unit Service Check

The printer does not recognize the Duplex Unit is attached. The
printer does not recognize tray options below the duplex unit are
installed.
FRU
1 Fuse F1 on Duplex Unit
System Board
2 Autoconnect Cables/
Connectors
Action
If fuse F1 is blown, replace the fuse.
If fuse F1 continues to blow, check
the stepper motor for a short
between the motor case and pins
J3-1 through J3-4. If no problem is
found, check the D.C. servo motor
pins J1-1 and J1-2 to the motor
housing for a short. If a short is
found, replace the motor assembly. If
no short is found, replace the system
board.
Check the autoconnect cables for
damage to the cables or the pins in
the connectors. If damaged, replace
the cable(s). If no damage is found,
check to make sure the cables are
connected to J9, J10, J11 and J12
on the duplex system board. If no
problem is found, replace the duplex
system board.
Diagnostic Information
2-45