Lexmark C750 Service Manual - Page 118
Lexmark C750 Manual
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5060-00x 271 Paper jam - Check Bin 1 Output expander-POST incomplete. Step 1 Actions and questions Pass thru sensor flag-check the sensor flag for correct operation. Is the flag operating correctly? 2 Pass thru sensor cable-make sure the pass thru sensor cable is correctly connected to J3 on the control board. Is the cable connected correctly? 3 Voltage check-disconnect the pass thru sensor cable from the control board and check the voltage on J3-3. The voltage measures approximately +5 V dc. Is the voltage correct? 4 Voltage check-measure the voltage at J3-2. The voltage measures approximately 0 V dc. Is the voltage correct? Replace the control board Replace the sensor assembly Go to step 4 Replace the control board Go to step 3 Reseat the cable Yes Go to step 2 No Repair or replace as necessary Output Expander, POST complete-First sheet of paper feeds into Output Bin 1. Note: Before proceeding with this service check run the Output Bin x Sensor Test and check for the failing sensor. Sensor tests: XNF F P Step 1 Near Full (Upper part of sensor assembly) Full (Lower part of sensor assembly) Pass Thru Sensor Yes Go to step 2 No Install the cable correctly. Actions and questions DC motor cable connection-make sure the DC motor connector is correctly installed at J4 on the Output Expander Option board. Is the cable installed correctly? 2 DC motor mechanical linkage assembly-check the resistance of the motor on the cable connector. Check the resistance between J4-1 and J4-2. The resistance measures between 115 and 135 ohms. Is the resistance correct? Go to step 3 Replace the DC motor mechanical linkage assembly. 3 D.C. motor mechanical linkage assembly-check for continuity between J4-1 and J4-2 and the case of the motor. It measures infinity. Is there continuity between J4-1 or J4-2 and the case of the motor? Note: If the motor is shorted from either J4-1 or J4-2 and the case of the motor, it may be necessary to replace the output expander control board. Replace the DC motor mechanical linkage assembly. Go to step 4 2-84 Service Manual