CHAPTER 6 FIXING SYSTEM
COPYRIGHT © 1999 CANON INC. CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
6-8
6.
Protective Functions
The machine is equipped with the following protective functions to prevent malfunction of the
fixing heater.
a.
Thermistor (TH1)
The microprocessor on the DC controller PCB monitors the voltage of the thermistor (TH1); if
an abnormally high or low temperature is detected, the microprocessor sends the fixing heater error
signal (HEAT_ERR*) to the timer circuit and, at the same time, indicate an error code (E000
through E003).
In response, the timer circuit sends the relay drive signal (RLOFF*) to the auxiliary power
supply in about 1.2 sec after it hs received the fixing heater error signal (HEAT_ERR*).
The auxiliary power supply turns off the relay (RL601) to turn off the power. The data for
problems associated with ‘E000 through E003’, i.e., related to the heater, is backed up and ‘E000
through E003’ will be indicated on the control panel next time the power is turned on.
When the power is turned off while ‘E000’ through ‘E003’ is indicated on the control panel,
‘E000 through E003’ will be indicated on the control panel if the power switch is turned on, and the
Copy Start key will not be enabled.
Related Error Code
E000
• The temperature detected by the thermistor (TH1) is not 65°C in 1.5 sec after the Copy
Start key is pressed.
• The temperature detected by the thermistor (TH1) is not 150°C in 4 sec after the Copy
Start key is pressed.
E001
• The temperature detected by the thermistor (TH1) is 230°C or more.
• The temperature detected by the thermistor (TH1) is higher than the control temperature
by 30°C or more.
• The thermistor (TH1) has detected an increase in temperature of 100°C or more in 1 sec.
• The thermistor (TH1) has detected an increase in temperature of 40°C or more after it
detected 100°C in standby state.
E002
The temperature detected by the thermistor (TH1) is 150°C or higher and, thereafter, maxi-
mum power has been supplied to the fixing heater for 10 to 14 sec during copying operation.
E003
The temperature detected by the thermistor (TH1) is 160°C and then 150°C or lower during
copying operation.
b.
Thermal Fuse (FU2)
If the temperature around the thermal fuse exceeds 228°C and remains so for a specific period
of time, the thermal fuse will blow to cut the power to the fixing heater.
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