Diagnostic Information; Power-On Self Test (Post) Sequence; Theory Of Operation; Print Engine - Lexmark Pro910 Series Service Manual

2. Diagnostic information

Power-On Self Test (POST) sequence

1.
Plug the printer into an electrical outlet.
2.
The printer automatically turns on. If the printer is already plugged into an electrical outlet and is in the Off
state, press
3.
The printer performs the Power-On Self Test (POST) sequence:
a.
,
b.
The Lexmark splash screen and progress bar appears.
c.
The purge pump runs, and shuts off.
d.
The carrier moves from the maintenance station, and returns.
e.
The scan bar moves from the home position, and returns.
f.
The home screen appears.
If any of these fail to occur, remove and reinstall the print cartridges, and then repeat the POST. If the POST
remains incomplete, see

Theory of operation

Print engine

The printhead system consists of a single ½-inch chip with 640 nozzles per color. The ink is supplied and stored
in individual felt-filled ink tanks. Upon installation of the tanks, the ink must be drawn from the tanks to the
printhead chip. This is accomplished by activating the pump to create a vacuum in the maintenance cap. The
vacuum is held until all air is purged from the ink system.
Media is loaded into the input tray where the paper guides are adjusted to center the media and ensure that it
sits squarely in the tray. When a print job is received by the printer, an authentication and maintenance
operation is invoked. During this operation, the validity of the tanks and the ink level in each tank are verified by
the tank security system. The printhead is then prepared for printing by wiping the surface of the chip and
activating each nozzle.
The printing operation is initiated as the pick roll, which is driven by the pick motor, applies a lateral force to the
top sheet of the media. This force overcomes the resisting force of the friction buckler, allowing the single sheet
to be separated from the remaining media stack. The pick roller moves the media sheet to the feed roller, which
hesitates to rotate until sheet is squared with nip. This corrects for skew. The pick roller is de-energized and now
the feed roller advances the media to the print zone. The printed image is applied in horizontal swaths as the
carrier drives the printhead across the page. Successive swaths are overlaid by repeatedly incrementing the
feed roller a set distance between print swaths. The printed media is driven out of the print zone by a nip formed
by a driven exit roller and fine-pointed star wheels.
If a duplex print job is selected, the media is not fully exited from the printer after the first side is printed, but is
driven just far enough to clear the upper duplex gate. At this point the pick motor is driven in reverse which lifts
the upper duplex gate. The feed roller is then driven in reverse and the media is fed into the duplex guides
where it is driven by the duplex roller. After the page is rotated in the duplexer, it arrives back at the now forward-
rotating feed roller and the second side is printed.
.
, , , , and light up.
"Service checks" on page 2-14. Find the symptom, and take corrective action.
Lexmark Pro910 Series
2-1
Diagnostic information
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