CANON PC420
Service Manual

CHAPTER 7 SELF DIAGNOSIS

CHAPTER 7 SELF DIAGNOSIS
The copier�s microprocessor on the DC controller/DC power supply PCB is equipped with a self diagnostic mechanism that checks the condition of the machine; when the mechanism detects an error, it indicates an error code on the copy count display. (The PC400/FC200 does not have a copy count display; it indicates an error condition by flashing the Jam indicator.) �E6� is represented by alternating

Code

Cause � Thermistor (TH1; faulty) � Fixing heater (H1; faulty) � DC controller/DC power supply (faulty)

Description � The temperature of the fixing heater is 215°C or more. � The temperature of the fixing heater does not reach 80°C within 2.5 sec after copying operation has started. � The temperature of the fixing heater lowers below 135°C after has reached 150°C. � The temperature of the fixing heater does not reach 150°C within 7.5 sec after copying operation has started. � The maximum supply power is detected for about 5 sec after the temperature of the fixing heater has reached 150°C.

(Note)

Note: If an error associated with �E0� is detected, �E� is displayed (PC420/430/FC220) or the Jam indicator (PC400/FC200) remains ON for about 0.5 sec; thereafter, the power goes out.

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