Lexmark C78x User Manual

2-68 Service Manual
5061
500-sheet drawer option
For 990.01 Service Error—Tray x, x=Tray 2, 3, or 4, 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.
Output expander
Step Actions and questions Yes No
1 Make sure the autocompensator cable is correctly
installed at the tray system board.
Is the cable correctly installed?
Go to step 2 Install the cable
correctly.
2
Make sure the drive assembly cable is connected
correctly to the tray system board.
Is the cable correctly installed?
Go to step 3 Install the cable
correctly.
3
Check for worn or broken parts in the autocompensator
and drive assemblies.
Are any parts worn, broken, or damaged?
Replace the
assembly that
has the defective
parts.
Replace the
FRUs in the
following order:
1. Electronic/
size sensing
assembly.
2. Autocom-
pensator
assembly.
3. Drive
Assembly.
Step Actions and questions Yes No
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?
Go to step 2 Reseat the cable,
and recheck for
correct operation
of the option.
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?
Go to step 3 Replace the
mechanical
linkage/DC motor
assembly.
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, the system board
may be damaged.
Replace the
mechanical
linkage/DC motor
assembly.
Go to step 4

Lexmark C78x Specifications

General

Brand	Lexmark
Model	C78x
Category	Printer
Language	English