CANON PC900
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CHAPTER 4 SELF DIAGNOSIS

CHAPTER 4 SELF DIAGNOSIS
A. Self Diagnosis

The microprocessor on the machine�s DC controller PCB is equipped with a self diagnostic mechanism that checks the condition of the machine (particularly, sensors) and indicates an error code in the count/ratio indicator on the control panel upon detection of a fault. In the case of �E001�, �E0� and �01� are flashed alternately.
Code Cause �E000�, �E001�, �E002�, or �E003� has occurred. � � � � � The thermistor (TH1) is faulty. The fixing heater (H1) is faulty. The thermal fuse (FU2) has blown. The DC controller PCB is faulty. The composite power supply PCB is faulty. Description The power switch is turned off and then on immediately after an error (�E000�, �E001�, �E002�, �E003�) has occurred. � The temperature detected by the thermistor (TH1) does not reach 65°C 1.5 sec after the Copy Start key has been pressed. � The temperature detected by the thermistor (TH1) does not reach 150°C 4 sec after the Copy Start key has been pressed. � The temperature detected by the thermistor (TH1) exceeds 230°C. � The temperature detected by the thermistor (TH1) exceeds by 30°C or more. � The temperature detected by the thermistor (TH1) registers an increase of 100°C or more within 1 sec. � The temperature detected by the thermistor (TH1) registers an increase of 40°C or more after it has reached 100°C during standby. � E0 detection signal (E0_DT) is detected twice or more in succession. � The temperature detected by the thermistor (TH1) has exeeded 150°C during copy operation and maximum power is applied for 10 to 14 sec thereafter. � The temperature detected by the thermistor (TH1) drops to and remains 150°C or lower after it has reached 160°C.

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� The thermistor (TH1) is faulty. � The DC controller PCB is faulty. � The composite power supply PCB is faulty.

� � � � � � � � � �

The thermistor (TH1) is faulty. The fixing heater (H1) is faulty. The thermal fuse (FU2) has blown. The DC controller PCB is faulty. The composite power supply PCB is faulty. The thermistor (TH1) is faulty. The fixing heater (H1) is faulty. The thermal fuse (FU2) has blown. The DC controller PCB is faulty. The composite power supply PCB is faulty.

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