Error Code - Lexmark C750 Service Manual

148 Error code

Step Action and questions
1 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
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?
+4.2 V dc
+5.0 V dc
+3.3 V dc
+24 V dc
Ground
0 V dc
+3.3 V dc
Yes No
Go to step 2 Install the cable
correctly
Replace the drive Go to step 3
motor
Go to step 4 Replace the ITU
drive motor cable
Replace the drive Go to step 5
motor
Replace the engine Go to step 6
board. If this does
not fix the problem,
replace the ITU
drive motor.
Contact your next Replace the ITU
level support motor drive
assembly
Diagnostic information
5060-00x
2-57