Lexmark C782 Service Manual - Page 123

5061 Duplex option service check Before proceeding with this service check: 1. Check for any pieces of media or obstructions in the duplex paper path that might cause a paper jam. 2. Check for correct installation of the front duplex jam tray and right side clearance tray. 3. Check the duplex option for any signs of loose, damaged, contaminated, or warped parts that might cause a jam. Duplex not recognized as being installed Step 1 2 Actions and questions Is duplex option the only option installed beneath the base printer? Except for the duplex option, remove any other paper options installed beneath the base printer. Does the printer recognize the duplex option as being installed? 3 Make sure the duplex option is correctly installed. Is the duplex option installed correctly? 4 Make sure the bottom options cable connector is snapped firmly into the bottom of the base machine. Is the cable connector mounted correctly? 5 Make sure the bottom options cable is installed correctly to system board connector J20. Is the cable installed correctly? 6 Check the voltages on connector J20 on the system board. The voltages are measured with the printer in standby mode: Connector pin Voltage J20-1 +5 V dc J20-2 Ground J20-3 Ground J20-4 +5 V dc J20-5 +24 V dc J20-8 +5 V dc J20-7 +5 V dc Note: All voltages are approximate values. Are the voltages correct? Yes Go to step 3 No Go to step 2 The problem is in one of the option(s) that is installed beneath the printer. Try to isolate which of the options is causing the problem. Go to step 4 Go to step 3 Install the duplex option correctly. Go to step 5 Install the cable correctly. Go to step 6 Install the cable correctly. Go to step 7 Replace the system board. Diagnostic information 2-81