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Product spec and feature
2-22
2.2.6 Engine F/W
2.2.6.1 Feeding
If feeding from the cassette the drive of the pickup roller is controlled by controlling the pick-up solenoid.
The on/off of the solenoid is controlled by controlling the general output port or the external output port. If
feeding from the manual feeder the set decides to feed the paper according to the operation of the manual
sensor, and by driving the main motor, insert the paper in front of the feed sensor. When paper moves the
occurrence of a paper jam is judged as below.
2.2.6.1(a) Jam 0 – Jam in Feed area
• After a page was picked up, paper did not enter the unit due to a paper misfeed.
• After a page was picked up, paper entered but it did not reach the feed sensor in certain time due to slip, etc.
• After a page was picked up, if the feed sensor is not on try to pick up again. After retrying if the feed
sensor is still not on after certain time, it is Jam 0.
- this indicates that the leading edge of the paper doesn't pass the feed sensor within a certain time.
• Even though the paper reaches the feed sensor, the feed sensor does not turn on.
- this indicates that the leading edge of the paper already passed the feed sensor or that the sensor is
fauty.
2.2.6.1(b) Jam 1 – Jam inside the print engine
• After the leading edge of the paper passes the feed sensor, the trailing edge of the paper does not pass
the feed sensor within certain time. (During this time the feed sensor cannot be Off)
• After the leading edge of the paper passes the feed sensor, the paper does not reach the exit sensor with-
in certain time. (The exit sensor cannot be On during this time)
- There is already paper between the feed sensor and the exit sensor.
2.2.6.1(c) Jam 2 – Jam in the Exit area
• After the trailing edge of the paper passes the feed sensor the trailing edge of the paper does not pass
the exit sensor within certain time.
2.2.6.2 Drive
The main motor drives the paper feed, developing unit and the Fuser It is driven by software which controls
the acceleration, constant speed and deceleration profiles. The Motor is managed with an A3977 driver IC
and controlled by step and enable signals from the CPU.
2.2.6.3 Transfer
The charging voltage, developing voltage and the transfer voltage are controlled by PWM (Pulse Width
Modulation). Each output voltage is changeable according to the PWM duty cycle. The transfer voltage
used when the paper passes the transfer roller is decided by environment recognition. The resistance value
of the transfer roller changes due to the surrounding environment in the room or within the set, this change
in resistance in turn changes the value of the voltage due to loading. This voltage is fed back into the set
through the A/D converter. Based on this fed back value the PWM cycle is changed to maintain the
required transfer voltage