Fixing Temperature Control - Canon LBP6000 Series Service Manual

Chapter 2

2.8.2.1.2 Fixing Temperature Control

LBP6000 / LBP6000B
This control is to keep the heater in the fixing film unit to the specified temperature.
The engine controller monitors the fixing heater temperature detection signal (FSRTH) and outputs the fixing heater drive signal (FSRD) according to the detected
temperature. The fixing heater drive PCB controls the fixing heater according to this signal to keep the fixing heater temperature within the target values.
The following is the block diagram of this control.
Engine controller
CPU
FREQSNS
FSRD
24VOFF
FSRTH
Fixing heater (H1)
Pressure roller
Thermal fuse (TP1)
There are 8 types of target fixing temperature depending on the fixing mode.
These types are according to the paper type settings and resolution settings (see the note below) etc. on a driver.
The following is the relation list of the fixing target temperature and the driver settings.
Settings on Printer Driver
Paper type settings
Plain paper
Plain paper L
Thick paper
Thick paper H
Transparency
Postcard/postcard H
Envelope
Labels
2-38
Low-voltage
power supply
FU101
Frequency
detection
circuit
(220-240V model only)
Thermistor (TH1)
Fixing film
Sub scanning direction
600dpi
400dpi
600dpi
400dpi
600dpi
600dpi
600dpi
400dpi
600dpi
400dpi
600dpi
600dpi
Fixing control
RL101
Fixing heater
drive circuit
F-2-48
T-2-10
Target fixing temperature
150 to 165 deg C
170 to 190 deg C
140 to 155 deg C
160 to 180 deg C
170 deg C
185 deg C
150 to 160 deg C
165 to 180 deg C
188 deg C
188 deg C
160 to 165 deg C
170 deg C
+24V
Relay drive
circuit
Fixing heater
safety circuit
0025-1177