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Chapter 5 Troubleshooting 5-1 DU-25 5.1. General This section explains how to take the corrective action against a trouble. Since every operating function of the duplexer is commanded through the communication with the printer, most troubles could happen due to the communication error between the duplexer and the printer. Firstly, following the basic check flow on the next page can lead you check and solve the errors involved with the communication circuit and the power supply. 5-2 DU-25 5.1.1. Preparation and precaution To operate the duplexer while it is separate from the printer, use an extension cable jig. It should allow the duplexer to be fed power from the printer. Before connecting an extension cable to the duplexer and to the printer, be sure that the printer's power switch is set to off. To conduct troubleshooting on the duplexer, no other option equipment should be con- nected together with the duplexer and the printer. 5-3 DU-25 5.2. Electrical troubleshooting The flow charts follow help isolate the defective parts in the duplexer. If the duplexer needs to be dismantled in the procedures below, refer to Chapter 2, Disassembly. 5-4 DU-25 5.2.1. Basic check The flow chart below is used to check the power lines and communication lines in the duplexer. This check must be conducted with the duplexer installed with the printer. Basic check 5-5 DU-25 5.2.2. "Duplex unit rear cover open" does not go off The rear cover status is monitored by a microswitch at the rear of the DU-25. Investigate this microswitch following the procedures below. Cover open message does not go off 5-6 DU-25 5.2.3. Feed motor does not rotate If the feed motor does not rotate, paper jam occurs. Investigate the motor power supply using the following procedures. Feed motor does not rotate 5-7 DU-25 5.2.4. Paper detection sensor The duplexer uses two sensors for detecting paper transportation. Failure of either sen- sor can cause paper jam. To investigate the failure of these sensors, start investigation on sensor 1, then 2 using the same manner as for sensor 1. Investigating failure on paper detection sensor 1 Using the same procedures above, investigate the operation of sensor 2 on the reversing bay unit. In doing so, use pin 18 of CN2 for pin 2 of CN4 on KP-639