Lexmark C780 Service Manual - Page 120
Black only retract (BOR) service check, Step D
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5061 Step D Step 1 2 3 4 5 6 Actions and questions Enter the Diagnostics Mode and select INPUT TRAY TESTS, Sensor Test, and Tray 1. You can activate the paper level sensor inside the printer. The paper level sensor is a dual sensor and checks the following levels for Tray 1. The Tray 1 level sensor is a dual sensor assembly that senses when tray 1 is empty, nearly empty, or partially empty. Does the Sensor Test pass? Paper level sensing assembly-Make sure the assembly is not loose or damaged. Make sure the bellcrank is not broken. Are any parts loose or broken? Check the paper level sensing cable for correct installation at JTRAY1 on the system board and to the paper level sensing dual sensor assembly. Is the cable connected correctly? Check the paper level sensing assembly flag for correct installation and that the flag is not broken or damaged. Is the paper level sensing assembly installed correctly and the flag not broken or damaged? Check continuity of the paper level sensing cable. Is there continuity? Check the voltage at JTRAY1. It should measure approximately +5 V dc. Is the voltage correct? Yes Contact your next level of support. Repair or replace parts as necessary. Go to step 4 Go to step 5 Go to step 6 Replace the level sensing assembly. No Go to step 2 Go to step 3 Install the cable correctly. Install correctly or replace the flag if damaged or broken. Replace the level sensing cable. Replace the system board. See "System board removal" on page 4-89. Black only retract (BOR) service check Step Actions and questions 1 Using the toggle ITU function in diagnostics mode, test the BOR system. Remove the print cartridges, and watch the belt while activating the toggle function. Does the ITU belt move up and down when the ITU is toggled? 2 Remove the ITU. Locate the BOR gear, and manually activate the gear. Verify that the front and back BOR cams are moving the respective bell cranks. Do the cams move back and forth properly? Yes Go to "Print quality service check" on page 2-93. Replace in the following order: 1. "BOR drive assembly removal" on page 4-34. 2. "System board removal" on page 4-89. No Go to step 2 Determine which component is preventing the proper movement. 2-78 Service Manual