Paper Jam Detection - Brother 1660E Service Manual

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).
Jam tray
STBY
Main motor
Pick-up
solenoid
Registration
sensor
Jam check
Jam inside (1)
STBY
Main motor
Paper feed
motor
Registration
sensor
Jam check
3.75 sec
Normal
Figure 2.21
PRINT
3.67 sec
Figure 2.22
II - 15
PRINT
3.75 sec
Jam
3.67 sec
Normal
Jam