Lexmark C750 Service Manual - Page 119

5060-00x Step 4 Actions and questions Output expander board-disconnect the motor cable from J4 and check the voltages at J4 on the board. Note: All voltages are approximate values: Connector pin Voltage, motor idle J4-1 J4-2 J4-5 J4-6 +24 V dc +24 V dc +5 V dc +5 V dc Yes Replace the DC motor mechanical linkage assembly. No Replace the output expander control board. Warning: Be careful not to short to adjacent pins on the connector. Are the voltages correct? 272 Paper jam - Check Bin x 5-Bin mailbox-POST complete Step 1 Action and questions Bottom pass thru sensor flag-make sure the flag is operating correctly and is not binding, broken, and there is no interference from the sensor cable. Is there any problem found with the sensor flag? 2 Bottom pass thru sensor-make sure the sensor is correctly connected to J5 on the control board. Is the sensor connected correctly? 3 Bottom pass thru sensor voltage check 1-disconnect the pass thru sensor cable and check the voltage at J5-3 on the board. The voltage measures approximately +5 V dc. Is the voltage correct? 4 Bottom pass thru sensor voltage check 2-check the voltage at J5-2 on the board, the voltage measures 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 Fix or replace the flag. No Go to step 2 5-Bin mailbox-POST incomplete Step 1 Action 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 sensor connected correctly? Go to step 3 Reseat the cable. Yes Go to step 2 No Repair or replace as necessary. Diagnostic information 2-85