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The main thermistor (TH1) has poor contact or open circuit. The thermal switch (TP1) has open circuit. The SSR is faulty. the DC controller is faulty.
The temperature of the fixing roller does not reach 100C with 2 min after it has exceeded 70C.
now you can do a full auto gradation under the additional functions button. just follow the instructions as you run it they are self explantory.
though my experience from working on them it is never that simple. there is so much involoved on the inside of this machine that will wear the toner starter out, the developers go bad, cleaning blades and several other factors all effect the color of this particular machine.
so start with the auto gradation and if that doesn't help then i would suggest getting a tech familure with that machine to come and fix it for you.
unfortunaly to tell you the only real way to have this problem fixed is to replace the drum and the drum blade.... though it might be possible to clean the drum depending on how bad the drum has gotten
According to Canon, this code is being thrown most likely because the fixer (fuser on Xerox copiers) is not seating properly inside the frame. Vibration coming from the copier operating is most likely jarring the wiring connector, making it work loose and causing the computer to throw this error code. There is a fix for this but unless you are a certified Canon Copier technician, it is highly recommended you contact Canon to send a tech to fix it. I hope this helps you.