990 Service Error - Lexmark C752 Service Manual

5060-2XX

990 service error

This error indicates which option is causing the error.
5-Bin mailbox
Step Action and questions
1 Mechanical linkage/DC motor assembly - Check the
DC motor cable connector to make sure it is installed at
J4 on the control board.
Is the cable connected correctly?
2 Resistance check - Disconnect J4 from the option
board and check the resistance of the motor on the
cable connector between J2-1 and J2-2. The
resistance measures between 115 and 135 ohms.
Is the resistance correct?
3 DC motor - Check between J2-1 and between J2-2 and
the case of the DC motor for shorts.
Is the DC motor shorted?
Note: If the DC motor is shorted, damage may result to
the control board.
4 Output expander control board check - Disconnect the
motor cable J2 and check the voltages at J2 on the
board.
Warning: Be careful not to short to adjacent pins on
the connector.
The voltages measure:
(Note: All voltages are approximate values.)
J2-1 (motor Idle) +24 V dc
J2-2 (motor Idle) +24 V dc
J2-3 (motor Idle) +5 V dc
J2-4 (motor Idle) +5 V dc
Are the voltages correct?
500-sheet drawer option
For 990 Service Error - Tray x, x=Tray 2, 3, 4 or 5, this is the tray that has a problem or needs service.
Note: Verify the autoconnect housing is correctly snapped into the printer and all options, and is plugged into
the system board correctly.
Step Action and questions
1 Make sure the autocompensator cable is correctly
installed at the tray system board.
Is the cable correctly installed?
Make sure the drive assembly cable is connected
2
correctly to the tray system board.
Is the cable correctly installed?
2-94
Service Manual
Yes No
Go to step 2 Reseat the cable
and recheck for
correct operation
of the option
Go to step 3 Replace the
mechanical
linkage/DC motor
assembly
Replace the Go to step 4
mechanical
linkage/DC motor
assembly
Replace the Replace the
control board mechanical
linkage/DC motor
assembly
Yes No
Go to step 2 Install the cable
correctly
Go to step 3 Install the cable
correctly