Lexmark C750 Service Manual - Page 137

5060-00x Step 4 Actions and questions Output Expander control board check-disconnect the motor cable J4 and check the voltages at J4 on the board. Warning: Be careful not to short to adjacent pins on the connector. The voltages measure approximate. Pins J4-1 J4-2 J4-3 J4-4 Voltages (motor idle) +24 V dc +24 V dc +5 V dc +5 V dc Yes Replace the Output Expander control board No Replace the mechanical linkage/DC motor assembly Are the voltages correct? Finisher Step 1 Actions and questions Make sure the top options cable is correctly plugged into the system board. Is the cable correctly installed? 2 Make sure the finisher cable is correctly installed on top of the printer. Is the cable correctly installed? 3 Make sure the finisher cable is correctly installed on the finisher system board. Is the cable correctly installed? 4 When 990 error is installed, press and hold Return and Select to view the sub error code. Scroll down with Menu to see the additional display lines and view the value at the indicated position (EQC and DB1) and match the information to the table below. Finisher (Bin 1) - No other output options 26 DB1 DB5 9D DB2 DB6 81 DB3 DB7 EQC DB4 Repair the finisher as indicated in the table. Contact your next level of support. Go to step 4 Install correctly Go to step 3 Install correctly Yes Go to step 2 No Install correctly Does the information on the table help find the problem? EQC 45 4C 50 DB1 05 0C 10 Explanation Jogger motor homing timeout error. Obstruction in Jogger, motor or sensor failure. Offset motor timeout error. No clearance around output bin, motor or sensor failure. Stapler unit is removed. Cable harness to stapler damaged or disconnected. Diagnostic information 2-103