Lexmark C720 Service Manual - Page 111

5024-001 Message 231 Paper Jam Duplex Low Door To locate the jam... Open the duplex unit lower door 24x Paper Jam Check Tray x Open the paper tray For details see... 231 check the duplex lower paper sensor (PT4) and actuator. Ensure connector CN6 on the duplex relay P.W.B. Board is plugged in. Replace the duplex relay P.W.B. board if necessary. If the paper jam still exists, go to "Duplex Paper Feed Service Check" on page 2-81. Note: Clear all paper from the paper path. 24x paper jam around (tray 1 or 2) Notes: - If the tray is difficult to remove, remove the tray above or below trays to remove jammed pages. - Ensure no paper is jammed at the pickup roll. - If clearing paper doesn't resolve the problem and you have a 241 error, go to "Paper Feed Service Checks" on page 2-77. If you have a 242 error, go to "Lower Feed Unit Paper Feed Service Check" on page 2-79. CAUTION: The inside of the printer may be hot. Allow the printer to cool before touching any internal components. Diagnostic Information 2-31