Printer Control System Motor Control Controlling the Fans Here, you will learn about the functions of the various motors used in the machine.

Motor Control

　

○Purpose: Here, you will learn about the functions of the various motors used in the machine.

　

1. Outline

The machine possesses 8 motors used for moving paper and drawing images.

These motors are DC motors or stepping motors used according to functions.

The following table shows types and functions of motors:

Notation Name Function Type Speed control Fault detection M2 Main motor drives the following: photosensitive drum, developing cylinder. DC motor yes yes M3 Fixing motor drives the following: fixing film, pressure roller. DC motor yes yes M4 Delivery motor drives the following: delivery roller. stepping motor yes no M5 Toner bottle rotation motor drives the following: toner feed plate. DC motor no no M6 Cassette 1 pickup motor drives the following: cassette 1 pickup roller, feed roller, separation roller. Stepping motor yes no M7 Cassette 2 pickup motor drives the following: cassette 2 pickup roller, feed roller, separation roller. Stepping motor yes no M10 Duplexing/feed motor drives the following: duplexing/feed roller, registration roller. stepping motor yes no M12 sub hopper feedscrew motor drives the following: sub hopper feedscrew. DC motor no no

　

　

2. Controlling the Rotation

The machine’s motors are controlled differently according to their function. Here, we will study how the rotation of the main motor (M2) and the fixing motor (M3) is controlled.
These motors are equipped with a mechanism to detect a fault.

　

a. Main Motor (M2)

The main motor rotates in response to the main motor drive signal (MAIN ON) coming from the DC controller.

As long as the motor is rotating normally, the lock signal (MAIN LOCK) is sent to the DC controller.

b. Fixing Motor (M3)

The fixing motor rotates in response to the fixing motor acceleration signal (/FUSER_M_ACC) and the fixing motor acceleration signal (/FUSER_M_FG) from the DC controller.

The revolution of the motor is monitored with reference to the speed detection signal (FUSR_M_FG) sent to the DC controller.

3. Detecting a Fault

The machine checks for a fault in the main motor (M2) and the fixing motor (M3) by having the DC controller monitor the motors at such times as programmed while the motors are being driven.

a. Fault in the Main Motor

1) Condition Identified as a Fault

The main motor fails to send the lock signal for a specific period of time.

2) Response

The machine will indicate an error code (‘E010-0000’) and disable printing operation.

3) Resetting

Replace the main motor. (For details, see descriptions of the tasks of the service person.)

　

b. Fault in the Fixing Motor

1) Condition Identified as a Fault

The revolution of the fixing motor is not identical to the target revolution over a specific period of time.

2) Response

The machine will indicate an error code (‘E014-0000’) and disable printing operation.

3) Resetting

Replace the fixing motor. (For details, see descriptions of the tasks of the service person.)

Controlling the Fans

　

○Purpose: Here, you will learn about the functions of the fans found in the machine.

1. Outline

The machine has 2 heat discharge fans.

These fans are used to cool the inside of the machine, and they rotate at different speeds to suit the temperature of the site of installation.

The specific functions of the fans are as follows, and the diagram shows the arrangement of the fans:

Notation Name Description Filter 2-speed control Failure detection FM1 Heat discharge fan(rear) Cools the fixing assembly Present Used Yes FM2 Heat discharge fan(front) Cools the fixing assembly Present Used Yes

2. Sequence of Operation

The following is the sequence of operation used to drive the fans:

1) Standby, Sleep

The heat discharge fans (FM1, FM2) are at rest.

　

2) Printing

The speed of the fans (full, half) is switched based on the reading of the environment sensor (HU1).

The reference reading differs according to the selected printing mode (single-sided, double-sided).

∙ Single-Sided Printing

Reading of environment sensor (HU1) Speed 30 deg C or more full less than 30 deg C half

　

∙ Double-Sided Printing

Reading of environment sensor (HU1) Speed 25 deg C or more full less than 25 deg. C half If there is any double-sided print in a continuous printing job, the fans will be controlled as for double-sided printing. 　 The following is a timing chart showing the sequence of operation used to drive the fans: 　 3. Controlling the Rotation a. Outline The fan rotates in response to the fan drive signal (FAN ON) from the DC controller. As long as it is rotating normally, the fan sends the lock signal (FAN LOCK) to the DC controller. b. Controlling the Speed The machine’s fans operate at 2 different speeds (full, half). The speed is switched by the voltage switchover circuit acting in response to a command from the CPU by changing the voltage level of the FAN ON signal. ∙ for full-speed rotation, generates 24V ∙ for half-speed rotation, generates 13V

4. Detecting a Fault

The machine checks for a fault in the front heat discharge fan (FM1) and the rear heat discharge fan (FM2).
Specifically, the DC controller monitors the operation of the fans while the printer unit remains supplied with power

a Condition Identified as a Fault

∙ while the fan is at rest, the lock signal is detected for 5 sec or more.

∙ while the fan is being driven, the lock signal is not detected for 5 sec or more

b. Response

The machine will indicate an error code (‘E805-0000’) and disable printing operation.

c. Resetting

Replace the fan. (For details, see descriptions of the tasks of the service person.)