Engine F/W Contol Algorithm - Samsung SCX 3205 Service Manual

2.2.5 Engine F/W Contol Algorithm

2.2.5.1 Feeding
If feeding from a cassette, drive of the pickup roller is controlled by a solenoid. The on/off of the solenoid is
controlled by controlling the general output port or the external output port. Provided below are the units jam
conditions:
Item
- After picking up, paper is not fed.
- After picking up, paper entered but it cannot reach to the feed sensor in a predetermined
time due to slippage, 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 still not on after a predetermined time, JAM 0 is displayed.
* 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
must clear the sensor within a predetermined time. (The feed sensor cannot be OFF)
2.2.5.2 Transfer
The charging, developing and the transfer voltages. are controlled by PWM (Pulse Width Modulation). 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 ; the voltage values change to compensate for the environmental conditions.
It is managed through an AD converter. The voltage value for the transfer roller is decided by the changed
value.
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