Canon Color imageRUNNER LBP5280, Service Manual, Page: 32 / 284

2
2
2-13
2-13
Technical Reference > Fixing System > Various Control Mechanisms > Controlling the Speed of Fixing Assembly
Technical Reference > Fixing System > Various Control Mechanisms > Controlling the Speed of Fixing Assembly
Fixing System
Overview
■ Overview
The fixing power supply controls the temperature in the fixing assembly. The printer uses an
on-demand fixing method.
Fixing
power suplly
FIXING TEMPERATURE signal
FIXING HEATER
DRIVE signal
Fixing
controll
circuit
DC Contoroller
Fixing heater
safety circuit
TH803
FU1
H801
TH801
TH802
Fixing Presser Roller
• Heater (H801): Heats the fixing film
• Main Thermistor (T801): for detecting the temperature of the Fixing Film(Contact
Thermistor)
• Sub Thermistor (T802): for detecting the temperature of the Fixing Film(Contact Thermistor)
• Sub Thermistor (T803): for detecting the temperature of the Fixing Film(Contact Thermistor)
• Thermal fuse (FU1): Prevents the fixing heater temperature from rising abnormally high
The thermal fuse is located at the center of the fixing heater.
If the temperature of the fixing heater rises abnormally high, the thermal fuse blows to
interrupt power supply to the fixing heater.
These temperature controls in the fixing assembly are performed by the fixing control circuit
and the fixing heater safety circuit according to the commands from the DC controller.
F-2-16
Various Control Mechanisms
■ Controlling the Speed of Fixing Assembly
The speed control of small size paper (throughput down control)
This is a control to prevent the abnormal temperature rising of the fixing heater end side when
printing continuously using less than A4 size width paper.
If the paper width is less 210 mm (A4 size) is printed continuously, it adjusts the number of
the sheets printed, spread the pickup interval and slow the throughput.
Setting on the driver Paper type Paper Print speed (ppm
Normal paper Normal paper (70 to 90g/m2) LTR 21.0 < 10.2 < 6.7 < 5.0 < 3.3
LGL 17.1 < 9.2 < 6.3 < 4.7 < 3.2
Normal paper L Thin paper (60 to 74g/m2) LTR 21.0 < 10.2 < 6.7 < 5.0 < 3.3
LGL 17.1 < 9.2 < 6.3 < 4.7 < 3.2
Heavy paper 1 Thick paper (86 to 119g/m2) LTR 21.0 < 10.2 < 6.7 < 5.0 < 3.3
LGL 17.1 < 9.2 < 6.3 < 4.7 < 3.2
Heavy paper 2 Thick paper (120 to 128g/m2) LTR 21.0 < 10.2 < 6.7 < 5.0 < 3.3
LGL 17.1 < 9.2 < 6.3 < 4.7 < 3.2
Heavy paper Thick paper (129 to 176g/m2) LTR 9.9 < 6.7 < 4.9 < 3.9 < 2.7
LGL 8.3 < 5.8 < 4.4 < 3.6 < 2.6
Coat paper 1 Coat paper (100 to 110g/m2) LTR 6.9 < 5.1 < 4.0 < 3.3 < 2.5
LGL 5.6 < 4.3 < 3.5 < 3.0 < 2.3
Coat paper 2 Coat paper (120 to 130g/m2) LTR 6.9 < 5.1 < 4.0 < 3.3 < 2.5
LGL 5.6 < 4.3 < 3.5 < 3.0 < 2.3
Coat paper 3 Coat paper (155 to 165g/m2) LTR 6.9 < 5.1 < 4.0 < 3.3 < 2.5
LGL 5.6 < 4.3 < 3.5 < 3.0 < 2.3