Lexmark C750 Service Manual - Page 120

5060-00x Step 3 Action and questions 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? Yes Go to step 4 No Replace the control board. 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. 274 Paper jam - Check Bin 4 5-Bin mailbox Note: When a 274 Paper Jam Check Bin 4 message appears, a problem exists with the top pass thru sensor Note: assembly or the control board. Step 1 Action and questions Top pass thru sensor flag-check the top sensor flag for correct operation, binding, broken parts or interference from the sensor cable. Are there any problem with the sensor flag? 2 Top pass thru sensor-make sure the top pass thru sensor is correctly connected to J11 on the control board. Is the sensor connected correctly? 3 Top pass thru sensor voltage check 1-disconnect the top pass thru sensor at J11 and check the voltage at J11-3. The voltage measures approximately +5 V dc. Is the voltage correct? 4 Top pass thru sensor voltage check 2-check the voltage at J11-2, the voltage should measure approximately 0 V dc. Is the voltage correct? Replace the sensor assembly Replace the control board Go to step 4 Replace the control board Go to step 3 Reseat the cable Yes Repair as necessary No Go to step 2 2-86 Service Manual