Engine F/W Control Algorithm; Feeding; Transfer - Samsung Xpress C480 Series Service Manual

2. Product specification and description

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. Provided below are the jam
conditions for the device:
Item Description
Paper Jam in • After paper pick up initialization, the paper is not fed.
Tray1
• After picking up the paper the lead edge does not reach to the feed sensor within a predetermined
period of time, due roller slippage, etc.
• After picking up the paper from the cassette, if the feed sensor is not detected, a re-pick up
initialization occurs. After re-picking up, if the feed sensor is still not on after a predetermined
amount of time, JAM 0 occurs.
Even though the paper reaches to the feed sensor, the feed sensor doesn't not change state.
•
Paper Jam • After the leading edge of the paper passes the feed sensor, the trailing edge of the paper does not clear
inside the feed sensor after predetermined period of time.
machine
• After the tail edge of the paper passes the feed sensor, the lead edge of paper is not detected by the exit
sensor within a predetermined period of time.
Paper jam in The tail edge of the paper does not clear the exit sensor within a predetermined period of time.
exit area

2.2.6.2. 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 provided when the paper passes the transfer roller
is decided by environment conditions. The resistance value of the transfer roller is changed when the Temperature and
Humidity Sensor in the device senses a change in the environment. The current to the Transfer Roller is changed through the
AD converter on the HVPS. The voltage value for provided to the transfer roller is decided by the changed value.
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