Canon PC400 Service Manual - Page 103
Protection Mechanisms, copying starts.
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CHAPTER 6 FIXING SYSTEM D. Protection Mechanisms The copier is equipped with the following protection mechanisms to prevent malfunction of the fixing heater. 1. The microprocessor monitors the voltage of TH1, and displays 'E0' (PC420/430/FC220)/ 'Jam' (PC400/FC200) and turns the power off upon detection of any of the following conditions: i. The temperature of the fixing heater does not reach 80°C 2.5 sec. after copying starts. ii. The temperature of the fixing heater does not reach 150°C within 7.5 sec. after copying starts. iii. The temperature of the fixing heater drops to 135°C or less after it has reached 150°C. iv. The temperature of the fixing heater rises in excess of 215°C. v.The maximum power (400 W) is detected for 5 sec. continuously after the temper- ature of the fixing heater has reached 150°C. 2. TH1 registers 234°C as the temperature of the fixing heater; as a result, the fixing heater error temperature detection circuit causes RELAYD to go '0' and the relay (RL101) to go OFF, thereby cutting the power to the fixing heater. 3. The thermal fuse (FU2) blows after it has reached 228°C and a specific time has passed to cut off the power to the fixing heater. COPYRIGHT © 1998 CANON INC. CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON) 6-5