Xerox Phaser 3300, Servce Manual

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Phaser 3300MFP Service Manual 2-33
Theory of Operation
Engine F/W
Control Algorithm
Feeding
If feeding from a cassette, the drive of the pickup roller is controlled by
controlling the solenoid. The on/off of the solenoid is controlled by controlling
the general output port or the external output port. While paper moves,
occurrence of Jam is judged as below.
Transfer
The charging voltage, developing voltage, and transfer voltage are controlled
by PWM (Pulse Width Modulation). Each output voltage is changeable due to
the PWM duty. The transfer voltage produced when the paper passes the
transfer roller is determined by environment recognition. The resistance value
of the transfer roller changes due to the surrounding environment of the set.
The voltage value, which also changes due to the environment, is changed
through AD converter.
ITEM Description
JAM 0
■
After picking up, paper cannot be entered due to paper is not fed.
■
After picking up, paper entered but it cannot reach to the feed sensor in
certain time due to slip, etc.
■
After picking up, if the feed sensor is not on, re-pick up. After re-picking
up, if the feed sensor is not on after certain time, it is JAM 0.
*It is a status that the leading edge of the paper doesn't pass the feed
sensor.
JAM 1
■
After the leading edge of the paper passes the feed sensor, the trailing
edge of the paper cannot pass the feed sensor after a certain time. (The
feed sensor cannot be OFF)
■
After the leading edge of the paper passes the feed sensor, the paper
cannot reach the exit sensor after certain time. (The exit sensor cannot be
JAM 2
■
After the trailing edge of the paper passes the feed sensor, the paper
cannot pass the exit sensor after certain time.
Dup
JAM 1
■
After the trailing edge of the paper passes the exit sensor, the paper
cannot pass the Dup sensor after certain time.
Dup
JAM 0
■
After the trailing edge of the paper passes the Dup sensor, the paper
cannot pass the feed sensor after certain time.