Specifications

10.10 PAPER FEED AND MISFEED DETECTION TIMING
The registration sensor and the exit sensor monitor the movement of the
paper through the paper path. If the CPU determines that a misfeed exists,
the Check Paper Path and the Misfeed Location indicators turn on. When the
main switch is turned on, the CPU checks these two sensors for initial
misfeed. During the copy cycle, the CPU performs three kinds of misfeed
detection:
J1: Checks whether the registration sensor is actuated within 10 pulses (40
milliseconds) after the registration clutch turns on. (The Misfeed Location
indicator "A" or "B" turns on.)
J2: Checks whether the exit sensor is actuated within 700 pulses (2.8
seconds) after the registration clutch turns on. (The Misfeed Location
indicator "C" turns on.)
J3: Checks whether the copy paper has passed through the exit sensor 2.75
(A4 sideways) or 2.80 (Letter sideways) seconds after the exit sensor has
been actuated. (The Misfeed Location indicator "D" turns on.)
1500 2000 2500 3000 3500 4000
1750
1877
2010
2273 (A4 S)
2000
J1
2010 2010
1433
500 m sec
2000
J1 2010
144 m sec
J1 2010 J1 2010
J2
2700
J2
2700
J3
2.75 sec (A4 sidewise)
2.80 sec (LT sidewise)
144 m sec
120 m sec
1750 1750
1877
2273 (A4 S) 1877
2273 (A4 S)
120 m sec
J1
120 m sec
J1
2000 2000
1433 1433
500 m sec 500 m sec
2000 2000
1433
500 m sec
144 m sec
0
100
400 m sec
100
100
2285 (LT S)
2285 (LT S) 2285 (LT S)
Timing Pulse
Start Key
Main Motor
<1st Feed Station>
1st Feed Clutch
Pick-up Roller
Registration
<2nd Feed Station>
Relay Roller
2nd Feed Clutch
Registration
Tray Lock Sol.
Exit Sensor
Registration
Registration
PAPER FEED AND MISFEED DETECTION TIMING
(4 m sec/pulse)
Release Sol.
Sensor
Clutch
Clutch
Sensor
Clutch
1 December 1990
2-69