Lexmark C 950 Service Manual

Diagnostic aids 3-79
  5058-030
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The media eject shaft assembly is driven by the media eject motor assembly to transfer media to the stacker 
media bin.
After media is transferred to the stacker media bin, it is held by the clamp paddle attached to the media eject 
shaft assembly.
From punch to upper media bin
The media to be ejected to the upper media bin is switched in the media path by the finisher diverter gate 
located behind the punch and fed in the upper media transport roll...

3-80  Service Manual 5058-030  
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Finisher
• Sensor (finisher media entrance)
–  A photo-reflective sensor detects whether media is fed from the bridge unit assembly to the finisher.
–  It turns high (+5 V dc) while media is present within the sensing area.
–  When the level turns high due to the first media of the second set during multi-set printing, this sensor 
activates the buffer diverter solenoid to switch the buffer diverter gate so that the media goes in the 
buffer roll...

Diagnostic aids 3-81
  5058-030
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Punch unit
This section describes the media punching operation of the punch.
Two types of punch are provided: the 2/3-hole type and the 2/4-hole type. 
The following explains the 2/3-hole type (2-hole/3-hole auto-switching).
Every type has the same construction, except for the sensor (punch hole select) that is provided for the 2-hole 
type and 3-hole type only. 
Adjusting punching positions
The punching positions from the media edge in the direction...

3-82  Service Manual 5058-030  
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The punch unit motor is rotated forward or reversely for each sheet of media, which is triggered by the sensor 
(punch cam front) being turned on/off.
Detecting punch waste full
Punch waste is stored in the punch waste box.
A sensor is provided to detect punch waste full.
When punch waste full is detected, it is notified to the operator only once.
Even if punch waste is not removed, the finisher can still punch media. However, it can spread punch...

Diagnostic aids 3-83
  5058-030
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Detecting punch waste box 
The sensor (punch waste box set) detects whether the punch waste box is properly set.
When the sensor (punch waste box set) does not detect that the punch waste box is properly set for four 
seconds, the punch waste box count is reset. 
Functions of punch sensors/motors
• Sensor (punch unit side registration 1)
–  A photo-reflective sensor that detects the side edge of large media. 
–  Media side edge is detected by On/Off...

3-84  Service Manual 5058-030  
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• Sensor (punch waste box set)
–  A photo-interrupter sensor that detects whether the waste box is properly set.
–  When the punch waste box is properly set, the actuator of the box blocks the light transmission of the 
sensor, which turns the sensor to high (+5 V dc). 
• Sensor (punch waste box full)
A photo-interrupter sensor that detects whether the punch waste box is filled with punch waste.
Compiler unit assembly
This section describes the...

Diagnostic aids 3-85
  5058-030
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Capacity of compiler unit assembly
Media volume that can be stacked on the compiler unit assembly is limited as shown in the table below. 
The number of sheets depends on whether media is stapled or not, as well as on media size. 
If the number of sheets of one set to be stapled exceeds the limit, the exceeding sheets are not stacked on the 
compiler unit assembly, and are forcibly ejected to the stacker media bin without being stapled. 
This forcible...

3-86  Service Manual 5058-030  
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The tamper positions during front tamping are shown below.
Rear tamping
Rear tamping is used in the following cases.
• When executing rear stapling (corner)
• When executing dual stapling
The tamper positions during rear tamping are shown below.Position Description
1 Front tamper home position—sensor (front tamper HP)
2 Front tamper size position
3 Front tamper offset position
4 Rear tamper home position—sensor (rear tamper HP)
5 Rear tamper standby...

Diagnostic aids 3-87
  5058-030
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Center tamping is used when executing rear stapling (straight).
The tamper positions during center tamping are shown below.
Determining tamper home position
When the sensor (lower media exit) turns high (+5 V dc) (light receiving), the front and rear tamper motors on 
the compiler unit assembly are activated, and the front and rear tampers start moving. 
The front tamper home position is determined when the front tamper enters the sensor...

3-88  Service Manual 5058-030  
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Offsetting
Offsetting is an operation to shift the position of media to be ejected to the stacker media bin so that boundaries 
between media units (sets of media, job units, etc.) can be easily recognized.
Offsetting is executed for staple positions:
• During front stapling (corner)—Shifts stapled sheets using the front tamper by 20 mm to the rear side before 
ejecting them to the stacker media bin 
• During rear stapling (corner/straight)
–  For...