Operation; External And Controls System; Fan; Fan Motor Control - Canon LBP3300 Series Service Manual

Table of Contents

Reversing

sensor

2.5.5.2 Operation

The duplex feed unit is driven by the main motor (M1).

When the first side of print paper is printed, the paper is once fed to the face-down tray.

The engine controller turns the reversing solenoid (SL3) ON after approx. 0.16 sec. from when the delivery sensor (PS915) detects the trailing edge of the print

paper. It results that the delivery roller rotates reversely and feeds the print paper into the duplex feed unit.

Then the engine controller turns the SL3 OFF at same time of that the reversing sensor (PS915) detects the trailimg edge of the paper.

The oblique roller feeds the print paper as its right side edge contacts with the standard plate.

It allow the paper to be compensated its skew and fed to the registration roller from the duplex feed unit.

Then the second side of the paper is printed and the paper is delivered to the face-down tray.

2.6 EXTERNAL AND CONTROLS SYSTEM

2.6.1 Fan

2.6.1.1 Fan motor control

The fan motor control drives the fan motor according to the commands from the CPU.

The control circuit of the fan motor is illustrated below.

CPU

IC201

P04

P03

The fan motor is a DC brushless motor unified with the hall effect device and it prevents rising in the temperature inside the printer.

The CPU (IC201) turns the pick-up solenoid OFF at the start of print operation. At the same time it puts the FAN MOTOR DRIVE signal (FANON) into "H" and

rotates the fan motor. Once the fan motor reaches at its prescribed rotational count, the FAN LOCK signal (FLOCK) is put

Face-down delivery roller

SL3

Delivery sensor

Engine controller PCB

Fan motor drive circuit

+3.3V

Oblique roller

F-2-21

+24V

J203-1

J203-2