Conveyance Section Main Unit Theory of Operation
2-92
II Composition/Operation
15.3.8 Media size error detection control
• To prevent incorrect printed pages, the size of the media being conveyed is detected
using the Synchronizing Roller Sensor (PC4) and Lower Feeder Paper Feed Sensor
(PC3 PF: option).
• The length of the media is detected based on the value calculated using the period of
time that begins when the sensor is activated and ends when it is deactivated for each
media source.
• For the Lower Feeder Unit, even if the Lower Feeder Paper Feed Sensor (PC3 PF) does
not detect a media size error, the downstream Synchronizing Roller Sensor (PC4) makes
an error check again.
• If there is a mismatch between the media size setting and the results of media size
detection, the machine suspends the print cycle and displays the message “SIZE/TYPE
ERROR (magicolor 5430 DL/5440 DL)” or “PAPER ERROR (magicolor 5450)” on the
panel.
• The media that has caused size error is fed out of the machine after going through the
2nd transfer and fusing processes.
• The subsequent sheets of media are subjected to the following operation.
Media state
Feed operation Print operation Exit operation
Media Print Feed
“TYPE ERROR” media Feed Print Exit
Subsequent
sheets
Yet to be printed
Yet to be
fed
Suspend Suspend Suspend
Printed Feed Print Exit
Yet to be printed
Fed
Feed Print Exit
Printed Feed Print Exit
Media source Media length detection sensor Starting point Ending point
Tray 1 Synchronizing Roller Sensor (PC4) Synchronizing
Roller Clutch (CL2)
energized
PC4 deactivated
Lower Feeder Unit
(Tray 2)
Lower Feeder Paper Feed Sensor
(PC3 PF: Tray 2)
PC3 PF activated PC3 PF deacti-
vated
Synchronizing Roller Sensor (PC4) CL2 energized PC4 deactivated
Lower Feeder Unit
(Tray 3)
Lower Feeder Paper Feed Sensor
(PC3 PF: Tray 3)
PC3 PF activated PC3 PF deacti-
vated
Lower Feeder Paper Feed Sensor
(PC3 PF: Tray 2)
PC3 PF activated PC3 PF deacti-
vated
Synchronizing Roller Sensor (PC4) CL2 energized PC4 deactivated
Duplex Unit No media length is detected.
Media state
Feed operation Print operation Exit operation
Media Print Feed
Size error media Feed Print Exit
Subsequent
sheets
Yet to be printed
Yet to be
fed
Suspend Suspend Suspend
Printed Feed Print Exit
Yet to be printed
Fed
Feed Print Exit
Printed Feed Print Exit
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