2. Product specifications and descriptions
2-41
Samsung Electronics
Service Manual
SCX-483x/5x3x series
2.2.6 Engine F/W Control Algorithm
2.2.6.1 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.
ITEM
Description
JAM 0
- After picking up, paper cannot be entered because 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 predetermined period of time, it is JAM 0.
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 predetermined period of time.
- After the leading edge of the paper passes the feed sensor, the paper cannot reach
the exit sensor after predetermined period of time.
*The paper exists between the feed sensor and the exit sensor.
JAM 2
- After the trailing edge of the paper passes the feed sensor, the paper cannot pass the
exit sensor predetermined period of time.
2.2.6.2 Transfer
The charging voltage, developing voltage and the transfer voltage are controlled by PWM (Pulse Width
Modulation). The 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 conditions. 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.
