Samsung ML-2150 Service Manual page 39

Summary of Product
4.5 Engine F/W
4.5.1 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. If feeding from a manual feeder, decide to
insert the paper according to the operation of the manual sensor, and by driving the main motor, insert the paper in front
of the feed sensor. While paper moves, occurrence of jam is judged as below. (Refer to the [6.2 Paper Transfer rout])
4.5.1.1 Jam 0
• After picking up, paper cannot entered due to paper mis-feed.
• 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, repack up. After repacking 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.
• Even though the paper reaches to the feed sensor, the feed sensor doesn't turn on.
- It is a status that the leading edge of the paper already passed the feed sensor.
4.5.1.2 Jam 1
• After the leading edge of the paper passes the feed sensor, the tailing edge of the paper cannot pass the
feed sensor after 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 On)
- The paper exists between the feed sensor and the exit sensor.
4.5.1.3 Jam 2
• After the tailing edge of the paper passes the feed sensor, the paper cannot pass the exit sensor after
certain time.
4.5.1.4 Duplex Jam 1
A leading edge of a paper didn't reach a Duplex Sensor after certain time passes.
4.5.1.5 Duplex Jam 2
After a leading edge of the paper passes the Duplex Sensor, the rear edge of the paper does not pass a
Duplex Sensor within a certain time.
4.5.2 Drive
A main motor (BLDC) drives a feeding and developing unit and an exit motor (Step) drives a Fuser and an
Exit ass'y.
When printing with a duplex function, it rotates the Exit Motor to a normal/reverse direction. It controls by
dividing the acceleration section, standard speed section, and reducing speed section. A BLDC Motor is
operated by a clock and enable signal, and a Step Motor is managed with an A3977 driver IC.
4.5.3 Transfer
The charging voltage, developing voltage and the transfer voltage are controller 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.
Service Manual
4-22
Samsung Electronics