Detecting Overheating; Protective Mechanisms - Canon CLC5000 Service Manual

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The machine is equipped with the following nine types of protective mechanisms to pre-

vent malfunction of the fixing heater and the oil heater.

6.6.1 Detecting Overheating (software)

The CPU on the DC controller PCB monitors the voltage of the upper main thermistor

(TH1), upper sub thermistor (TH2), lower main thermistor (TH3), and lower sub thermistor

(TH4), and issues the following error codes when detecting an overheating condition:

Upper thermistor (TH1)

Lower thermistor (TH3)

6.6.2 Detecting Overheating (hardware)

When the overheating detection circuit on the DC controller PCB detects any of the fol-

lowing temperature readings, it issues the corresponding error codes; it will then cause the

power OFF signal (PWOFF*) to go '0' so as to turn off the power switch (SW2).

Upper main thermistor (TH1)

Upper sub thermistor (TH2)

Lower main thermistor (TH3)

Lower sub thermistor (TH4)

Detection temperature

Detection temperature

2000 2000 2000 2000

CANON CLC5000 REV.0 JAN. 2001

CHAPTER 2 NEW FUNCTIONS

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