Cassette Pickup; Separation Roller Method; Fixing Unit System; Overview/Configuration - Canon LBP5050 Series Service Manual

Chapter 2

2.5.3 Cassette Pickup

2.5.3.1 Separation Roller Method

LBP5050N / LBP5050
The printer has a separation roller method to prevent multiple sheets of media from entering to the printer.
The paper separation roller follows the rotational direction of the pick-up roller because it does not have its own driving force.
- Normal-feed
The separation roller is driven by the pickup roller through a sheet of print media. That is, the separation roller rotates in the media feed direction.
- Multiple-feed
The low friction force between the sheets weakens the rotational force from the pickup roller. The separation roller is limited its rotational force and it does not
rotate with such weak driving force from the pickup roller. As the separation roller does not rotate, the multiple sheets are not fed to the printer.

2.6 FIXING UNIT SYSTEM

2.6.1 Overview/Configuration

2.6.1.1 Outline

LBP5050N / LBP5050
The fixing power supply controls the temperature in the fixing unit. The printer uses an on-demand fixing method.
TH802
Fixing film
- Heater (H801): Heats the fixing film
- Thermistor (T802): Detects the fixing film temperature (Contact type)
2-12
Separation roller
<Normal-feed>
H801
FU1
FIXING TEMPERATURE signal
Pressure rolleTER
Pickup roller
Media
Lifting plate
The separation roller does not rotate.
<Multiple-feed>
F-2-17
Fixing power supply
Fixing control
circuit
FIXING HEATER
DRIVE signal
F-2-18
0018-6697
0018-6518
DC controller
Fixing heater
safety circuit