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4.4 Paper Jam Detection
The printer has a registration sensor and a paper eject sensor at the paper outlet to detect
whether the printed paper has been fed correctly. A paper jam is detected by whether the paper
is present at the sensor at the check periods programmed in the engine CPU memory. If the
engine CPU detects a paper jam, the main motor, paper feed motor and scanner motor is turned
off immediately and the jam status is transmitted to the video controller circuit.
A paper jam is detected in any of following conditions:
1) Paper exists at the paper ejection sensor or the registration sensor when power is
switched on. (JAM REAR or JAM INSIDE)
2) Paper has not reached the registration sensor within a specified time (JAM TRAYS).
3) Printed paper has not passed through the registration sensor within a specified time (JAM
INSIDE (1) ).
4) Printed paper has not reached the paper ejection sensor within a specified time (JAM
INSIDE (2) ).
5) Printed paper has not passed through the paper ejection sensor within a specified time
(JAM REAR).
Figure 2.22
Figure 2.21
Main motor
Registration
sensor
Pick-up
solenoid
STBY PRINT
Jam check
JamNormal
5 sec5 sec
Jam
4.9 sec4.9 sec
Normal
Main motor
Registration
sensor
Paper feed
motor
Jam check
STBY PRINT
Jam inside (1)
Jam tray