Canon imagePRESS 1135 Series Service Manual page 128

2
Technology > Fixing System > Various Types of Control > Fixing temperature control
● Protection function Function
Stop power distribution to the heater when the fixing heater temperature reaches an
abnormally high temperature.
Fxing assembly
[12]
External heating
upper roller
External heating
lower roller
Fixing roller
Pressure roller
Fixing heater
driver PCB
(PCB57)
External heating
[11]
1 CPU monitoring circuit Monitor runaway of CPU.
2 Connection detection Detect missing of the thermistor connector
3 Heater error detection Detect excessive temperature increase of the heater.
4 External heating roller HP detection Detect attachment of the external heating roller when the
fixing motor stops.
Prevent the external heating roller from continuing to
come into contact with the fixing roller.
5 Triac short detection Detect damage / short of the triac.
6 Excessive temperature increase Detect excessive temperature increase of a heater.
detection (hardware detection)
7 Heater error detection Detect abnormal temperature of the heater.
(hardware detection)
8 Heater control circuit Turn off the heater.
9 Relay control circuit Turn off the AC relay.
10 Heater OFF circuit Turn off the heater.
11 Relay OFF circuit Turn off the AC relay.
12 AC relay Block the AC line.
13 Thermo switch Block the AC line.
14 Detection of excessive temperature Detect excessive increase of the thermistor software.
increase (software detection) Turn off the heater / AC relay.
2 Technology > Fixing System > Various Types of Control > Fixing temperature control
DC controller PCB (PCB1)
CPU
[1]
[3]
[7]
[4]
[2]
[8]
HP-SNS signal [13]
Fixing motor
lock signal
[14]
OR
[9] [5]
[10] [6]
ASIC
F-2-110
T-2-75
2-80
2-80