Engine F/W Contol Algorithm - Samsung ML-1665 Service Manual

2.2.5 Engine F/W Contol Algorithm

2.2.5.1 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
- 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
JAM 0
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.
- Even though the paper reaches to the feed sensor, the feed sensor doesn't be ON.
* It is a status that the leading edge of the paper already passes the feed sensor.
- After the leading edge of the paper passes the feed sensor, the trailing edge of the paper
JAM 1
cannot pass the feed sensor after a certain time. (The feed sensor cannot be OFF)
2.2.5.2 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 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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