Lexmark Optra C710 Service Manual - Page 195

5016-001 FRU 3 Paper Pass Sensor Rear Duplex Unit (S3) 4 Lower Unit Parts 5 Lower Unit Reverse Motor Action Check the voltages on the duplex rear unit paper pass sensor on connector CN904. Pin # 8 10 12 Voltage Signal DGND BPSN 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 12 is incorrect, replace the duplex option controller board. • If the voltage on pin 10 does not change when the sensor is opened and closed, replace the FRUs in the following order: 1. Duplex rear unit paper pass sensor 2. Duplex option controller board Check all parts associated with paper movement in the lower duplex unit for correct operation and signs of wear, broken parts or binds. Repair or replace as necessary. Check the voltage on the lower duplex unit reverse motor on CN906. Pin # 1 (Blue) 2 (Brown) 3 (Orange) 4 (Yellow) 5 (Red) Voltage Signal BPB COM BP AP APB Voltage Static +24 V dc +24 V dc +24 V dc +24 V dc +24 V dc All voltages are approximate values. • If the voltages are correct, replace the motor. • If the voltages are incorrect, replace the duplex option controller board. Diagnostic Information 2-129