Lexmark C950 Service Manual

Diagnostic aids 3-125
5058-030
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HCF media transport roll assembly operation
Upon receiving the feed start signal from the controller the HCF activates the HCF transport motor at a high
speed after a preset time has passed. This rotating power of the HCF transport motor is transmitted to the HCF
media transport roll assembly, and the media from the HCF media feed unit assembly is transferred to the
printer.
When the sensor (tray 5 feed-out) is turned on by the media fed with the HCF media transport roll assembly, the
HCF transport motor speed decreases after a preset time has passed.
When the sensor (registration) in the printer is turned on by the media fed from the HCF, the HCF transport
motor turns off.
When the next feed start signal is received, before the HCF transport motor is turned off, the transport motor
continues to rotate.
Thus, media is transferred from the HCF media transport roll assembly to the laser printer.
HCF media feed unit assembly sensor/motor functions
Functions of the sensors and motors of the media feed unit assembly are outlined below.
• HCF media feed lift motor—is a stepping motor that rotates (forward) the pick roll and feed roll to send
media from the tray to the HCF media transport roll assembly. The motor also lifts the tray by reverse
rotation.
• HCF pick solenoid—Raises or lowers the pick roll. The HCF pick solenoid stays activated from the
beginning of media feed until the sensor (pre-feed) turns on. The HCF pick solenoid is activated when the
tray is inserted and when the power is turned on to check the presence of media in the tray.
• Sensor (pre-feed)—Detects whether media has been fed from the tray, and controls the HCF feed lift
motor speed. The sensor also becomes a trigger to deactivate the HCF pick solenoid. The sensor turns on
upon detecting media, and determines that media is present.
• HCF transport motor—is a stepping motor that rotates the HCF media transport roll assembly to feed
media to the printer.
• Sensor (tray 5 feed-out)—Detects whether media has been fed from the tray, becomes a trigger to stop
the HCF feed lift motor, and controls the HCF transport motor speed.
Media
HCF media transport
roll assembly
Sensor (tray 5 feed-out)
HCF transport motor

Lexmark C950 Specifications

General

Print Resolution	1200 x 1200 dpi
Duplex Printing	Yes
Processor Speed	1.2 GHz
Connectivity	Ethernet, USB
Print Technology	Laser
Print Speed	50 ppm
Monthly Duty Cycle	300000 pages
Recommended Monthly Page Volume	5, 000 - 33, 000 pages
Memory	1024 MB
Hard Drive	Optional
Output Capacity	500 sheets
Interface	USB 2.0
Media Type	Plain paper, Card stock, Labels, Envelopes, Transparencies
Total Media Capacity	5140 sheets
Media Sizes	Letter, Legal, A4, A5, Executive, Folio, Statement
Operating Systems Supported	Windows, Mac, Linux