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Summary of Product
WorkCentre PE16July 2003
Service Manual
4.5 Engine F/W
4.5.1 Feeding
If feeding from the cassette, the pickup roller drive is controlled by the solenoid. The solenoid is switched
on and off by contro signals from either the general output port or the external output port. If feeding
from the manual feeder, paper presence is sensed by the manual sensor, and paper is fed by driving the
main motor, insert the paper in front of the feed sensor. While paper moves, occurrence of jam is judged
as below. (Refer to 6.2 Clearing Paper Jams])
4.5.1.1 Jam 0
• Paper is picked up, but cannot enter path due to paper feed failure.
• Paper is picked up and enters path, but it cannot reach the feed sensor in specified time due to slip, etc.
• After pick up, if the feed sensor is not on, pick up is repeated. After repeating pick up, if the feed sensor
is still not on after the specified time, Jam 0 is set.
- Jam 0 status indicates that the leading edge of the paper doesn’t pass the feed sensor.
• Even though the paper reaches the feed sensor, the feed sensor doesn’t turn on.
- It is a status that the leading edge of the paper already passes the feed sensor.
4.5.1.2 Jam 1
• After the leading edge of the paper passes the feed sensor, the trailing edge of the paper does not pass the
feed sensor after the specified time. (The feed sensor cannot be Off)
• After the leading edge of the paper passes the feed sensor, the paper does not pass the exit sensor after
the specified time. (The exit sensor cannot be On)
- The paper remains between the feed sensor and the exit sensor.
4.5.1.3 Jam 2
• After the trailing edge of the paper passes the feed sensor, the paper does not pass the exit sensor after
the specified time.
4.5.2 Drive
By gearing, the main motor drives the rollers such as feeding roller, developing roller, fuser roller, and dis-
tributing roller. The step motor is controlled for the sections, acceleration section and fixed speed section.
In the initial stage of the motor run, appoint the acceleration section to prevent the isolation of the motor. It
is controlled by the A3977 motor driver IC. The step signal and the enable signal are sent to make the
phase for driving the motor in CPU.
4.5.3 Transfer
The charging voltage, developing voltage and the transfer voltage are controlled by PWM (Pulse Width
Modulation). Each output voltage is changeable due to the PWM duty. The transfer voltage admitted
when the paper passes the transfer roller is decided by environment recognition. The resistance value of
the transfer roller is changed due to the surrounding environment or the environment of the set, and the
voltage value, which changes due to the environments, is changed through AD converter. The voltage
value for impressing to the transfer roller is decided by the changed value.
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