Dell 5330dn - Workgroup Laser Printer B/W, Service Manual

Page: 39 / 204

Product spec and feature
2-28
Service Manual
2.2.4 Engine F/W
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.
ITEM Description
JAM 0 - 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 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.
JAM 1 - After the leading edge of the paper passes the feed sensor, the trailing edge of the
paper cannot pass the feed sensor after a 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.
JAM 2 - After the trailing edge of the paper passes the feed sensor, the paper cannot pass
the exit sensor after certain time.
DUPLEX
JAM0
- After the trailing edge of the paper passes the exit sensor, the leading edge of the
paper cannot reach the duplex sensor after certain time.
DUPLEX
JAM1
- After the leading edge of the paper passes the duplex sensor, the leading edge of
the paper cannot reach the feed sensor after certain time.
2) Driver
By gearing, the main motor drives the rollers such as feeding roller, developing roller, fuser roller, and exiting
roller. The step motor is controlled for the such acceleration section and steady section. In the initial stage of
the motor run, appoint the acceleration section to prevent the step-out of the motor. It is controlled by the A
3977 motor driver IC. The step signal and the enable signal are sent to make the phase for driving the motor
in CPU.