VIII. SELF DIAGNOSISThe microprocessor on the machine’s DC controller PCB is equipped with amechanism that checks the condition of the machine (of its sensors, in particular), andindicates an error code when it detects a fault.A. CopierCOPYRIGHT © 1997 CANON INC. CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CHAPTER 11 TROUBLESHOOTING11-259Code Cause• Main thermistor (TH1; poor contact,open circuit)• Fixing heater (H1, H2; open circuit)• SSR (fault)• DC controller PCB (fault)• Sub thermistor (HH2; poor contactor open circuit; the power will turnoff in about 5 sec after indication)• Main thermistor (TH1; short circuit)• SSR (fault)• DC controller PCB (fault)• Sub thermistor (TH2; errortemperature increase)• Main thermistor (TH1; poor contact,open circuit)• Fixing heater (H1, H2)• Thermal switch (TS1; open circuit)• SSR (fault)• DC controller PCB (fault)• Main thermistor (TH1; poor contact)• Fixing heater (H1, H2; open circuit)• Thermal switch (TS1; open circuit)• SSR (fault)• DC controller PCB (fault)• SSR (fault)• DC controller PCB (fault)• Cleaning belt for the fixing assembly(taken up)• Cleaning belt sensor (PS11; fault)• DC controller PCB (fault)• Connector for fixing assembly (fault;rear)• DC controller PCB (fault)Description• The temperature of the upper fixingroller does not reach 70°C within 3min and 30 after power-on.• The temperature of the upper fixingroller exceeds 230°C for 2 sec ormore.• The temperature of the upper fixingroller does not reach 100°C in 2 minafter it has reached 70°C.• The temperature of the upper fixingroller does not reach 150°C in 2 secor more after it has reached 100°C.• The temperature of the upper fixingroller is 70°C or less for 2 sec ormore after it has reached 100°C.• The SSR used to drive the fixingheater has a short circuit.• The cleaning belt for the fixingassembly has been taken up morethan specified.• The fixing feeding assemblybecame disconnected duringcopying.E000(Note 1)E001E002E003E004E005E006
