Lexmark Optra C710 Service Manual - Page 193

5016-001 FRU 3 Duplex Rear Unit Door Open Sensor(S8) Duplex Option Controller Board Action Check the voltages on the duplex rear unit door open sensor on connector CN904. Pin # 7 9 11 Voltage Signal DGND BOSN VL Voltage Closed 0 V dc +5 V dc +5 V dc Voltage Open 0 V dc 0 V dc +5 V dc All voltages are approximate values. • If the voltage on pin 11 is incorrect, replace the duplex option controller board. • If the voltage on pin 9 does not change when the rear unit door is opened and closed, replace the FRUs in the following order: 1. Duplex rear unit door open sensor 2. Duplex option controller board H 231 Paper Jam displays. Paper is jammed in upper or rear unit of the duplex option. FRU 1 Upper Duplex Unit Rear Duplex Unit 2 Upper Transfer Roller Upper Pinch Rollers Transfer Drive Pulley Rear Unit Gears Action Check for pieces of paper or other material, in the upper and rear duplex units, that might cause a paper jam. Check all the parts associated with paper movement in the upper and rear duplex units for correct operation and signs of wear, broken parts or binds. Repair or replace as necessary. Diagnostic Information 2-127