Lexmark C 950 Service Manual

Diagnostic aids 3-119
  5058-030
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Switch (media size)
The switch (media size) switches the setting of the size of media supplied from each media tray assembly. A 
signal indicating the set size is transmitted as a voltage to the printer engine card assembly.
Sensor (media out)
If there is no media in the media tray assembly, the media out actuator lowers and the flag of the media out 
actuator that has stayed in the sensor (media out) sensing area leaves there. Thus, the light of the...

3-120  Service Manual 5058-030  
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Sensor (tray 2 feed-out)
The sensor (tray 2 feed-out) detects media fed from the tray 2.
Tray module media transport roll assembly 
The tray module transport roll assembly feeds media from the tray 2.
Tray module drive motor 
This motor is used to drive the media transport mechanism in the tray module.
1TM controller card assembly
The 1TM controller card assembly, which contains a CPU, controls media feed in the 1TM upon receiving a 
command from the...

Diagnostic aids 3-121
  5058-030
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Switch (media size)
The following table gives on/off states of the switches on the switch (media size), corresponding to the media 
sizes of the media tray assembly.
Note:  The switches (media size) are denoted by “S/W1” and “S/W3” respectively from the left side.
Media SizeAnalog switch
S/W1S/W3
No TrayOffOff
B5L/7.25” x 10.5”LOffOn
8.5” x 11”LOnOff
A4LOnOn 

3-122  Service Manual 5058-030  
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High capacity feeder theory of operations 
Media feeding 
Outline
The HCF feeds media from the tray to the printer through the HCF media feed unit assembly and the HCF media 
transport roll assembly.
HCF media feed unit assembly
The pick roll feeds media from the tray. The feed roll and the separation roll feed media from the pick roll to the 
HCF media transport roll assembly.
Rollers are driven by the media feed lift motor on the media feed unit...

Diagnostic aids 3-123
  5058-030
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The sensor (tray 5 feed-out) detects the presence of media fed from the tray and controls the media feed lift 
motor stop and the transport motor speed. It also detects media jams to identify the media jam zone.
HCF media feed unit assembly operation
Upon receiving the feed start signal from the controller, the HCF activates the pick solenoid after a preset time 
has passed to press the pick roll against the media in the tray.
After a preset time has...

3-124  Service Manual 5058-030  
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the solenoid is activated at low-voltage, it maintains the actuation state at the low voltage, while pressing the 
pick roll against the media in the tray. 
When the media is transferred to the printer and the sensor (tray 5 feed-out) turns on, the pick solenoid is 
reactivated for a preset time.
Media feed lift motor start/stop timing and revolutions are controlled based on the timing of the HCF feed lift 
motor start signal and the sensor...

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...

3-126  Service Manual 5058-030  
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The sensor turns on (light receiving) upon detecting media, and determines that media is present.
Status monitoring
This function includes detection of static media jams, interlocking, and insertion of the HCF media tray 
assembly.
Static media jam detection 
This function checks the status of all relevant sensors on the media path to detect media jams. When media is 
present on the sensor, it is treated as a static jam. This detection of media jam...

Diagnostic aids 3-127
  5058-030
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When open, the switch (top door interlock) is detected, printing operation is inhibited, and the 24 V supply to the 
media feed lift motor and the transport motor is shut off. When open, the switch (HCF unit docking interlock) is 
detected, and transfer of media from the HCF is inhibited.
Tray insertion detection
The sensor (HCF media tray set) checks whether the tray is properly set. This check is constant while the power 
is on. Printing operation...

3-128  Service Manual 5058-030  
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Media size detection
When media is loaded in the tray, the media size is automatically detected by the rear media edge guide that is 
attached to the media tray assembly and aligned with the side of the media. The position of the rear media edge 
guide is detected by the sensor (HCF media size L) and the sensor (HCF media size R). 
Note:  B5L and 7.25” x 10.5” L can be switched by the NVM. 
The media size is detected during the start-up procedure and...