Output Expander - Lexmark C752 Service Manual

Step Action and questions
3 Check for worn or broken parts in the autocompensator
and drive assemblies.
Are any parts worn, broken, or damaged?

Output expander

Step Actions and questions
1 Mechanical linkage/DC motor assembly - Make sure
the DC motor cable connector is installed at J4 on the
output expander 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 J4-1 and J4-2. The
resistance should measure between 115 and 135
ohms.
Is the resistance correct?
3 DC motor - Check between J4-1 and between J4-2 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 system board.
4 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 approximately:
J4-1 (Motor Idle) +24 V dc
J4-2 (Motor Idle) +24 V dc
J4-3 (Motor Idle) +5 V dc
J4-4 (Motor Idle) +5 V dc
Are the voltages correct?
Yes No
Replace the Replace the
assembly that FRUs in the
has the defective following order:
parts
1. Electronic/
size sensing
assembly
2. Autocom-
pensator
assembly
3. Drive
Assembly
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
output expander mechanical
control board linkage/DC motor
assembly
Diagnostic information
5060-2XX
2-95