Lexmark C720 Service Manual - Page 117

5024-001 Optional Duplex Unit Symptom Table Symptom Printer does not clear or reset Operator Messages or controls for Duplex Unit Paper Feed problems for Duplex Unit Paper Jam error code 231, 230 No power Duplex Unit fails to move paper through, into or out of the Duplex Unit. Activates something during POR. Paper fails to enter Duplex Unit from Fuser Duplex Fan does not come on Paper fails to re-enter printer Action Go to "Operator Messages" on page 2-9 and follow action to be taken. Go to "Duplex Paper Feed Service Check" on page 2-81. Go to "Operator Messages" on page 2-9 and follow action to be taken. Go to "Options No Power Service Check" on page 2-72. Go to "981-Duplex Motor (DPM1, DPM2) Service Check" on page 2-56. Go to "982-Duplex Upper Solenoid (DSOL-U) Service Check" on page 2-58. Go to "Duplex Paper Feed Service Check" on page 2-81. Go to "983- Duplex Fan (D-FAN) Service Check" on page 2-59. Go to "984-Duplex Lower Solenoid (DSOL-L) Service Check" on page 2-60. Go to "Duplex Paper Feed Service Check" on page 2-81. Diagnostic Information 2-37