Misfeed Check - Ricoh FT4430 Service Manual

MISFEED CHECK

Feed-in
Motor
R e g l s t r a t l o n
Sensor
Exit
Sensor
[S-38]
Three sensors are used for misfeed checks: the entrance sensor [S-35],
registration sensor [S-37], and exit sensor [S-38]. After the feed-in motor
[M-14] is energized, the original activates the entrance sensor. The DF CPU
checks to see if the entrance sensor has been activated (entrance sensor ON
check) 475 ms after the feed-in motor has been energized. Then, 350 m s
after the entrance sensor is activated, the DF CPU checks to see if the
registration sensor has been activated (registration sensor ON check).
The OFF check is carried out when the belt drive motor [M-16] is de-
The
energized.
deactivated (registration sensor OFF check). There is no off check for the
entrance sensor.
The ON check for the exit sensor occurs 400 ms after the feed-out and belt
drive motors are re-energiied. The OFF check for the exit sensor is done
1,250 ms after the exit sensor is activated. When a misfeed is detected, the
DF CPU stops the DF and sends a misfeed signal to the copier. The lift switch
cancels a misfeed condition.
350 ms
DF CPU checks to see if the registration sensor has been
[s-35]
[s-37]
7-13
16 April '88
ON check
OFF check