Lexmark C750 Service Manual - Page 91

5060-00x 148 Error code Step 1 Action and questions Connector J64 on the engine board-check for correct installation of the ITU drive motor cable from the ITU drive motor to the engine board connector J64. Is the cable connected correctly? 2 ITU drive motor-check for continuity between pin 4 of CON1 on the motor drive card and the remaining pins in the connector. Do you measure continuity? Note: The ITU drive motor can be removed from the printer without removing the complete ITU drive motor assembly. If the ITU drive motor assembly is removed be careful not to spill toner that may be contained in the auger system. 3 ITU drive motor cable-check the continuity of the ITU drive motor cable. Do you measure continuity? 4 ITU drive motor voltage check-measure the voltage on connector J64 on the engine board. The voltages are approximately values. Voltages motor not running Connector pin Voltages (motor not running) J64-2 J64-4 J64-6 J64-8 J64-10 J64-12 J64-14 +4.2 V dc +5.0 V dc +3.3 V dc +24 V dc Ground 0 V dc +3.3 V dc Yes Go to step 2 No Install the cable correctly Replace the drive motor Go to step 3 Go to step 4 Replace the ITU drive motor cable Replace the drive motor Go to step 5 Are the voltages correct? 5 ITU motor drive assembly-remove the ITU assembly. Manually turn the motor. The gears in the ITU motor assembly, the second transfer roll gears, and the cleaner gear should turn freely. Do the gears turn freely? 6 ITU motor drive assembly-remove the ITU drive motor assembly. Manually turn the motor. Do the gears on the ITU drive motor assembly turn freely? Replace the engine board. If this does not fix the problem, replace the ITU drive motor. Contact your next level support Go to step 6 Replace the ITU motor drive assembly Diagnostic information 2-57