Samsung ML-1750 Specifikace stáhnout pdf (Strana 37)

4-20

SUMMARY OF PRODUCT

Samsung Electronics

Service Manual

4.6 Engine F/W

4.6.1 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. 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])

4.6.1.1 Jam 0

• After picking up, paper cannot entered due to paper didn’t 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 be on.

- It is a status that the leading edge of the paper already passes the feed sensor.

4.6.1.2 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.

4.6.1.3 Jam 2

• After the tailing edge of the paper passes the feed sensor, the paper cannot pass the exit sensor after

certain time.

4.6.2 Drive

By gearing, the main motor drives the rollers such as feeding roller, developing roller, fuser roller, and dis-

tributing roller. The step motor is controlled for the sections, acceleration section and fixed speed section.

In the initial stage of the motor run, appoint the acceleration section to prevent the isolation of the motor. It

is controlled by the A3977 motor driver IC. The step signal and the enable signal are sent to make the

phase for driving the motor in CPU.

4.6.3 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.

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Bendix BW2832 User Manual (2 pages)

Brand: Bendix | Category: Modulator | Size: 0.39 MB |

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Samsung ML-1750 Specifikace Strana 37

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